Two RTX Connector Failures Just Broke Both Pieces of Advice. Neither Had a Third-Party Cable

By Indie Kings | September 27, 2026

Updated September 27, 2026: Two separate RTX connector failures reported this week each break one of the two pieces of advice routinely given about the 12V-2x6 socket. An RTX 4090 burned a contact on the official bundled adapter while power limited to 80 percent, about 360W. And a PNY RTX 5090 melted at both ends of a native cable from an ATX 3.1 supply, with no adapter, no splitter, stock VBIOS, no overclock and the power limit below stock, after which the owner says PNY rejected the warranty claim on the grounds that the native PSU cable is not covered. What saved the 4090 was not the power limit. It was the owner noticing black screens early.

RTX 5090 power delivery and 12V-2x6 connector under DLSS 5 load

Image: RTX 5090 12V-2x6 connector under DLSS 5. Credit: VideoCardz / QuasarZone.

The two pieces of advice, and two counterexamples

Almost two years of 12VHPWR and 12V-2x6 failures have produced a short, widely repeated list of things a card owner is told to do. Two of them are about prevention, and they are the two most commonly repeated.

The first is that you should power limit the card. Cutting the power target reduces current through the small conductors at the connector, which is the actual failure mechanism, and it is the standard advice given for a card that has already had a problem. The second is that you should stop using the bundled adapter and move to a native 12V-2x6 cable from an ATX 3.1 supply, which removes the adapter from the chain entirely and is sold as the fix by the power supply vendors.

Two reports this week sit on top of each other and break both. One is an RTX 4090 that was power limited to 80 percent, roughly 360W, and still burned a contact on the official Gigabyte adapter that shipped in the box. The other is a PNY RTX 5090 that melted at both ends of a native cable, on an ASRock ATX 3.1 supply, with no adapter, no splitter, stock firmware, no overclock, and a power limit below stock, and the owner says the warranty claim was then refused.

That is not a claim that the advice is wrong in general. It is a claim that the two mitigations have already failed in documented cases under conditions that satisfied them, which means they are not sufficient, and a reader deciding what to do with a 600W card should know that.

The 4090: official adapter, 80 percent power limit, still burned

This case is reported by UNIKO's Hardware, which has been tracking burned RTX power connectors, and it originated from a Reddit thread on r/pcmasterrace.

The setup, as reported: an RTX 4090, the official 16-pin adapter included with the Gigabyte card, and a power limit of 80 percent. The owner stated the reduced limit was being used deliberately, for lower temperatures, lower power consumption and additional safety. Against a 450W reference target for the 4090, 80 percent works out to roughly 360W, which is the territory of an RTX 5080. VideoCardz's own note in the report is that RTX 5080-class cards are known to be much less prone to these issues, which is the entire basis of the power limiting advice.

So on the prevention checklist this case scores as well as a case can. Official adapter, not a third-party one. No daisychaining, which VideoCardz flags as a factor in many reports. Power limited well below the card's own default. The result was still damage.

The symptom that preceded the visible damage is the part with practical value. The owner reports that the problem started with random black screens where the display would disappear while audio kept playing. That is the failure signature of a connector that has begun to degrade rather than one that has failed outright, and it is why the card survived. On inspecting the power connector, the owner found visible damage around one of the contacts.

VideoCardz's assessment is that this was spotted early and that it is probably what saved the card. That is a reasonable reading, and it is also the thread that ties both cases together.

The 5090: native ATX 3.1 cable, both ends melted, warranty refused

The second case is a Reddit report from the owner of a PNY GeForce RTX 5090, and it is the more severe of the two.

The configuration, as the owner states it: a PNY RTX 5090 connected with the native 12V-2x6 cable included with an ASRock PG-1600G ATX 3.1 power supply. No adapter and no splitter were used. The VBIOS was stock. The card was not overclocked. The power limit had been reduced below stock settings. On that reading the case satisfies every condition the native-cable advice is meant to satisfy, and more.

The outcome is that both ends of the cable were damaged, including the connector at the graphics card and the connector at the PSU side, and the GPU is no longer detected by the system. A card that vanishes from the system entirely is a materially worse outcome than a single contact degrading.

The owner's images are the evidence, and VideoCardz reproduces them. The thing worth noting is the ASRock PG-1600G, because that supply is the subject of a separate report on this site about a cable thermal sensor in an ASRock platform that sat at the wrong end of the cable and did not act before a 600W RTX PRO 6000 melted. Two ASRock-supply incidents in a week is worth noticing on its own, and we are not asserting a connection between them beyond the shared model of power supply.

What actually saved the 4090

Strip the two cases down and the protective mechanisms that did not fail sit next to the one that did.

Measure	RTX 4090 case	RTX 5090 case
Power limited below stock	Yes, 80 percent, about 360W against 450W	Yes, below stock
Official cable or adapter	Yes, the bundled Gigabyte 16-pin adapter	Yes, the native cable bundled with an ATX 3.1 supply
Adapter or splitter in the chain	Yes, the official one	No
Stock firmware and no overclock	Not stated in the report	Yes, both
Outcome	Visible damage around one contact	Damage at both ends, GPU no longer detected
What limited the damage	Random black screens noticed early	Nothing. The card was lost
Warranty	Not reported	Owner says PNY rejected the claim, citing the native PSU cable

The pattern is uncomfortable but it is the pattern. In the case where the card survived, the saving grace was a display symptom, not a preventive setting. The card had been power limited to a level that is supposed to make this class of failure unlikely, and the failure happened anyway on the adapter the manufacturer supplied.

That is worth stating carefully rather than dramatically. The reasonable conclusion is that monitoring beats mitigation. The black screens are a leading indicator that the connector has begun to fail, and they showed up before the damage became catastrophic. The power limit is a real reduction in stress but it is a probabilistic reduction, and this case is the documented instance where the dice came up wrong on a well-mitigated configuration.

The practical advice that follows is narrow and it is the only thing the evidence supports. Random black screens with continuing audio on a card with a 16-pin connector are a reason to power down and look at the connector now, not a reason to clear the event log and carry on. That is a two-minute check that demonstrably saved a 4090.

The warranty trap in using the native cable

The PNY case carries a second problem that is separate from the physics and is arguably worse for the owner.

Per the report, the owner says PNY rejected the warranty claim, and the stated reason is that the native PSU cable is not covered. So the configuration that satisfies the prevention advice is the configuration that voids the warranty.

VideoCardz supplies the context that makes this intelligible, and the context is an absence. The report notes that NVIDIA has never clearly explained which cables are recommended and which should be avoided, that board partners appear to give different answers, and that most of the reported connector failures continue to involve the RTX 5090. In other words the manufacturer of the socket has not published guidance, the board partners do not agree, and the component vendors have been selling native cables as the fix for the problem the socket created.

What is left for an owner is a choice between two bad options. Use the bundled adapter, which is where the 4090 case burned, and which has the advantage of being covered. Or move to a native ATX 3.1 cable, which removes the adapter from the chain, and which the PNY case shows can still fail at both ends, and which the owner says was grounds for refusing the claim.

It is worth being clear about the status of that refusal. We have the owner's account, relayed by VideoCardz, and VideoCardz attributes it as the user saying the company rejected the claim. [NEEDS VERIFICATION] on the specifics, because we have not seen PNY's stated policy in writing and a cable-coverage exclusion is the kind of term that belongs in a warranty document rather than a Reddit post. What is established is that the owner says it happened.

The ASRock thread, which is not a coincidence

Two of the three recent incidents on this site involve ASRock power hardware, and it is worth putting them next to each other without overstating anything.

The PNY 5090 case used an ASRock PG-1600G, a 1600W ATX 3.1 supply, and the card was lost. Separately, an ASRock platform's cable thermal sensor was reported as sitting at the wrong end of the cable and failing to act before a 600W RTX PRO 6000 melted. Both are ASRock power products, both involve a 16-pin class connector carrying very high current, and neither was saved by a sensor or a setting.

What that pattern does and does not mean is worth being exact about. A common vendor across two incidents out of a large population of reported failures is not evidence of a defect. Two samples cannot separate a component-quality signal from base rates, and the wider failure population includes reports against many different supply and board brands. The honest statement is that if a reader is choosing between otherwise equivalent ATX 3.1 supplies, these two reports are a reason to look, not a reason to rule anything out.

The more useful observation is structural rather than brand specific. In both ASRock cases the protective feature either was not present or was not positioned where it could act. A thermal sensor at the wrong end of a cable reports the temperature of the wrong conductor. That is a design and placement question, not a component quality question, and it is the kind of thing that would apply equally to any manufacturer who put the sensor in the wrong place.

What these two cases do not establish

Four limits, because connector failures generate a lot of confident claim and very little controlled data.

These are two cases, not a rate. Neither was reproduced under test conditions. Both are owner reports, one relayed from a Reddit thread and one from a hardware-monitoring account, and neither has a root cause analysis. We have no denominator for how many cards are power limited or using native cables without incident, so neither can be turned into a probability.
They do not show the mitigation is useless. A power limit that reduces connector current is still correct practice. These cases show it is not sufficient, and they are the interesting cases precisely because everything else was also right.
They do not show a native cable is worse than an adapter. The two reports describe different failures in different configurations. The 4090 damaged one contact and survived; the 5090 damaged both ends and did not. Without knowing how many of each configuration fail, comparing the two configurations is not a valid inference.
They do not show DLSS 5 is involved here. The thermal case published separately measured a 5090's connector at 91.7C with DLSS 5 enabled against 80.9C without, and that is a real mechanism for pushing a connector harder. Neither case in this piece reports what software was running, so neither can be linked to it.

FAQ

Does power limiting to 80 percent stop an RTX connector from melting?

Not on its own, based on a reported case. An RTX 4090 was running at an 80 percent power limit, roughly 360W against a 450W reference, using the official adapter bundled with the Gigabyte card, and still sustained visible damage around a contact. It had no third-party cable and no daisychaining. The power limit remains good practice because it reduces current through the conductors, but this case is a documented instance where a well-mitigated configuration still failed.

Is using a native ATX 3.1 12V-2x6 cable safer than the bundled adapter?

It removes the adapter from the chain, which is the reasoning behind the advice. But a PNY RTX 5090 is reported to have melted at both ends of a native cable from an ATX 3.1 supply, with no adapter, no splitter, stock VBIOS, no overclock and a power limit below stock, and the GPU stopped being detected. One case cannot tell you which configuration fails more often, because we have no rate for either. The mitigation is defensible and it is not sufficient.

What actually saved the RTX 4090 in that case?

Noticing the symptom early. The owner reports the problem began with random black screens where the display disappeared while audio continued playing, and on inspecting the connector afterwards found visible damage around one contact. VideoCardz assesses that catching it at that point is probably what saved the card. The practical read is that random black screens with continuing audio on a card with a 16-pin connector are a reason to power down and inspect the connector, not something to dismiss.

Why was the PNY warranty claim refused?

The owner says PNY rejected the claim on the grounds that the native PSU cable is not covered. We are marking the specifics as needing verification, since we have not seen a written PNY policy and this is the kind of exclusion that belongs in a warranty document. The broader context from VideoCardz is that NVIDIA has never clearly stated which cables are recommended and which to avoid, that board partners appear to disagree, and that most reported failures involve the RTX 5090.

Is there a pattern to which power supplies are showing up in these reports?

Two of the recent incidents on this site involve ASRock power hardware. The lost PNY RTX 5090 ran on an ASRock PG-1600G ATX 3.1 supply, and separately an ASRock platform's cable thermal sensor was reported as sitting at the wrong end of the cable and not acting before a 600W RTX PRO 6000 melted. That is two cases, and the wider failure population includes many different supply and board brands, so it is not evidence of a defect. It is a reason to look if you are choosing between otherwise equivalent ATX 3.1 supplies. The transferable point is not the brand: in both cases the protective feature was either absent or positioned where it could not act, and a thermal sensor at the wrong end of a cable is measuring the wrong conductor whoever assembled it.

How hot does the connector actually get?

A separate QuasarZone test measured an RTX 5090 Founders Edition's 12V-2x6 connector at 91.7C with DLSS 5 enabled against 80.9C without, in Cyberpunk 2077 at 4K on the Ultra preset for 20 minutes at 27.5C room temperature, with the sense-pin side measured by thermal camera. The same test put the connector at 83.4C on the latch side with DLSS 5 on, and the RTX 5080 Founders Edition far cooler in both directions at 48.6C and 52.2C. Neither case in this report states what software was running, so neither can be tied to that mechanism.

Bottom Line

Two reports in the same week, and the useful thing about them together is that they knock down the two pieces of advice that the last two years of connector failures have produced. Power limit the card, and use a native cable instead of the adapter. The first case is an RTX 4090 at 80 percent, about 360W against a 450W reference, on the official adapter Gigabyte shipped in the box, with no third-party cable and no daisychaining, and it burned a contact anyway. The second is a PNY RTX 5090 on a native 12V-2x6 cable from an ASRock PG-1600G ATX 3.1 supply, with no adapter, no splitter, stock VBIOS, no overclock and the power limit below stock, and it melted at both ends and disappeared from the system.

Neither of those is a reason to stop power limiting or to go back to the bundled adapter. Both are reasons to understand that the mitigations are not sufficient, which is a different and more useful claim than the folk advice usually makes. A power limit reduces current through the small conductors at the connector and that is genuinely correct practice. It is a probabilistic reduction, and these are the documented cases where the dice came up wrong on a configuration that satisfied every condition the advice asks for. The native cable removes the adapter from the chain, which is a real improvement in topology, and the 5090 case shows the remaining connector can still fail at both ends with nothing else wrong.

The thing that actually protected hardware in this pair is not a setting, it is a symptom. The 4090's owner noticed random black screens where the picture vanished but the audio kept playing, powered down, and found damage around a single contact. VideoCardz judges that this is what saved the card, and the reasoning holds up: a display dropout with continuing audio is a connector that has begun to degrade, which is a leading indicator rather than a final failure. The 5090 had no such window. So the narrow advice the evidence actually supports is that on a 16-pin card, random black screens with continuing audio mean power down and look at the connector now. It is a two-minute check with a demonstrated record of preventing a loss, which is more than the power limit has to show in either of these cases.

There is a second problem hiding in the PNY case, and it is worse for the owner than the physics. The owner says PNY refused the warranty on the grounds that the native PSU cable is not covered, which means the configuration that satisfies the prevention advice is the one that voids the warranty. VideoCardz's own reporting supplies the reason that trade exists: NVIDIA has never clearly said which cables to use and which to avoid, board partners give different answers, and component vendors have been selling native cables as the solution to a socket standard they helped create. An owner is left choosing between the adapter, which is where the 4090 burned and which is covered, and the native cable, which is what the 5090 died on and which the owner says was grounds for refusal. We are marking the warranty specifics as needing verification, because an owner's Reddit account is not a warranty document, and that exclusion should be a written term before anyone relies on it either way.

One pattern is visible and worth stating without inflating it. Two of the recent incidents on this site involve ASRock power hardware, a 1600W ATX 3.1 supply in the lost 5090 and a platform whose cable thermal sensor sat at the wrong end of the cable and did not act before a 600W RTX PRO 6000 melted. Two samples cannot separate a component signal from base rates, so that is a reason to look, not a reason to rule anything out. The transferable lesson is not about the brand. It is that in both cases the protective feature was either absent or positioned where it could not act, which is a design and placement question rather than a quality one, and a thermal sensor at the wrong end of a cable is reporting the temperature of the wrong conductor regardless of who assembled it. Neither of these cases has a root cause analysis, and both are owner reports rather than tested reproductions, so the honest summary is that the mitigations have documented failures, the symptom that saved the one surviving card was noticed by a person and not by a setting, and the warranty position on the recommended fix is unresolved.

Source: VideoCardz, Running at 80% power didn't save this RTX 4090, even with the official power adapter, September 27, 2026, which is the source for the 4090 case, the 80 percent and 360W figures, the official bundled adapter, the black screen symptom and the single damaged contact, and which credits UNIKO's Hardware and the original r/pcmasterrace report by u/InteKontoEtt. VideoCardz, PNY rejects melted RTX 5090 claim, says native PSU cable is not covered, September 25, 2026, is the source for the PNY 5090 case, the ASRock PG-1600G ATX 3.1 supply, the native cable with no adapter or splitter, stock VBIOS, no overclock, the reduced power limit, damage at both ends and the warranty refusal, and credits the owner report on Reddit. VideoCardz is also the source for the observation that NVIDIA has never clearly stated which cables to recommend. The connector temperatures in the FAQ are from the separate QuasarZone test reported by VideoCardz on September 24. The PNY warranty specifics are marked as needing verification