ASRock's Cable Thermal Sensor Sits at the Wrong End, and a 600W RTX PRO 6000 Melted Anyway

By Indie Kings | September 27, 2026

Updated September 27, 2026: A 600W NVIDIA RTX PRO 6000 Blackwell Workstation Edition survived a 16-pin cable failure because the melt happened on the power supply side, and the reason it survived is the same reason the protection did not work. ASRock's Taichi TC-1650T ships ATX 3.1 cables with a TempGuard thermal sensor, and ASRock places that sensor at the VGA connector, which is the graphics card end of the cable. This failure was at the supply end. The monitor was watching the wrong half of the cable, and VideoCardz's assessment is that a sensor at both ends would likely have prevented it.

Verification note: This is a single-source report and we have labelled it as one. The evidence is photographs posted by a user, u/ScientiaEtRatio91, in the r/pcmasterrace subreddit, reported by VideoCardz on September 13, 2026 by WhyCry. We have not tested TempGuard, we have not seen the unit, and we have not independently confirmed that the protection failed to act. That specific claim is the reporting user's, relayed by VideoCardz, and it is the load-bearing claim in this article, so it is attributed rather than asserted. ASRock's sensor placement and TempGuard's stated design intent come from ASRock as reported by VideoCardz.

Melted 16-pin power connector on the supply side of an ASRock power supply

Image: the melted connector. Credit: reporting user via Reddit, published by VideoCardz.

What happened, and what survived

A system arrived at a repair shop consisting of an NVIDIA RTX PRO 6000 Blackwell Workstation Edition connected to an ASRock Taichi TC-1650T, which is a 1650W ATX 3.1 power supply. The 16-pin power connector failed and melted into the socket on the supply side of the cable.

Two details frame everything else. First, the graphics card came through it. Second, according to the report, both ends of the cable were fully inserted at the time of failure, which rules out the usual first explanation.

The card is not a low-value part. The RTX PRO 6000 Blackwell Workstation Edition is NVIDIA's 96GB professional Blackwell card, and the owner described it as worth around $16,000 at current prices, a figure consistent with NVIDIA having raised its price. NVIDIA rates it for up to 600W total board power over a single PCIe CEM5 16-pin connector, which puts it in the same maximum power range as a GeForce RTX 5090 while targeting professional and AI workloads rather than gaming.

So this is a 600W professional card on a 1650W supply, drawing through the same connector class that we have written about melting repeatedly, and this time the expensive end of the cable survived intact.

What TempGuard is supposed to do

The relevant feature is ASRock's, and naming it matters because it is a protection mechanism that did not protect.

The Taichi TC-1650T ships with two native 12V-2x6 cables, which is the ATX 3.1 approach of a fully rated high current connector rather than an adapter. Those cables carry TempGuard, an NTC temperature sensor integrated into the cable assembly. Per ASRock as reported by VideoCardz, the sensor sits at the VGA connector and is designed to monitor temperature and signal the power supply when temperatures rise beyond the intended operating range. The stated intent is a shutdown of the system when the sensor detects an unsafe temperature.

That is a reasonable design in principle. A connector that is about to melt usually gets hot first, and putting a thermistor in the path gives the supply a chance to cut power before the plastic deforms.

The reporting user states that the thermal protection did not react before the connector melted. We want to be careful here, because that is the claim the whole story rests on and we cannot verify it independently. There are ordinary explanations that would not implicate the sensor at all: the joint may have failed mechanically rather than thermally, a connector can melt at a contact point that the sensor is not physically near, or the sensor and its wiring may have been part of what failed. None of those are established, and none are ruled out. What is established is that the cable melted and the card did not, and that the feature marketed to prevent exactly this did not visibly prevent it.

The sensor is on the wrong end for this failure

This is VideoCardz's analysis and it is the part of the story that generalises beyond one damaged unit.

A cable has two ends, and they can fail independently. One end mates to the graphics card, the other to the power supply, and a thermal event can originate at either. TempGuard monitors the graphics card end.

When the melt occurred on the supply side, the sensor was at the far end of the cable from the failure. VideoCardz's conclusion is that the sensor should have been placed on both ends of the cable, and that this would likely have prevented the issue.

That is a small hardware change with a large consequence, and it is the sort of thing that is cheap to do and expensive to have designed wrong. A single thermistor in a cable assembly saves component cost and board space. Two thermistors, with the supply monitoring both, costs very little more and covers both failure sites. The design as described covers one end, which means it provides protection against a failure mode it cannot see.

There is a further wrinkle worth naming. A sensor at each end also gives you something more useful than protection: it tells you which end went. The March incident described below was on the card side, this one was on the supply side, and the only reason we know the difference is that somebody photographed it. Two sensors and a log would have answered that question on its own.

This is the third incident, not the first

The most important framing is that none of this is new, which makes it worse rather than better.

Incident one, on a GeForce RTX 5090. VideoCardz has previously reported that the same TempGuard design failed to shut the system down after an RTX 5090 power connector melted. That report is the reason the sensor placement was publicly described in the first place, and it means the failure mode was already documented before this case.

Incident two, in March, on this exact card and supply combination. An RTX PRO 6000 Blackwell owner reported that the 12V-2x6 cable from an ASRock Taichi TC-1650T became scorched, this time on the graphics card side. In that case PNY reportedly inspected the card and returned it because it remained functional, and ASRock replaced the damaged cable. VideoCardz notes that case included no photographs, which is why the outlet did not run it at the time, and we are treating it accordingly. It is a single unverified report, but it is the same card, the same supply and the same cable, and it was on the other end from this one.

Incident three, the case above. Power supply side, card survived, photographed and published.

Incident	Card	Failed at	Outcome	Evidence
Earlier, on a GeForce RTX 5090	RTX 5090	Not specified in the reporting available	System did not shut down, per VideoCardz's prior report	VideoCardz's own earlier coverage
March 2026	RTX PRO 6000 Blackwell	Graphics card side, scorched	Card survived, PNY inspected and returned it, ASRock replaced the cable	No photographs, unverified, the outlet did not run it at the time
September 2026	RTX PRO 6000 Blackwell Workstation Edition	Power supply side, melted into the socket	Card undamaged, protection reported not to have acted	Photographs, single forum report

All three incidents involve the ASRock Taichi TC-1650T and its TempGuard 12V-2x6 cables. The March case is a single unverified report and is presented as such.

So the design has now failed at both ends of the same cable, on two different cards from the same vendor family, and the thermal protection that is supposed to detect either event did not visibly act in the case with photographic evidence. Two of the three are the same product pairing, which makes coincidence a less comfortable explanation.

What ATX 3.1 was supposed to prevent

The reason this is a standard story and not only a component story is that the connector in question exists because of a specification.

The 12V-2x6 connector was introduced alongside ATX 3.0 and 3.1 specifically to address the melting problem, and the design intent was that a fully rated native connector, properly seated, with correct pin sensing, would not fail the way the older 12VHPWR adapter did. Sense pins were part of that: the standard added detection so that a cable which is not correctly seated is recognised as not correctly seated, rather than carrying 600W through a partially inserted connector and heating up at the contact.

That makes this failure more uncomfortable than a generic bad component, because the connector is the standardised answer to the problem and it is not working as intended. The cable here was fully inserted, which is the state the standard is designed to reward.

It is worth separating two claims that are easy to conflate. Nobody is suggesting the 12V-2x6 standard is wrong. The argument is narrower: a supply shipping an ATX 3.1 cable with an integrated thermal sensor has added a protection layer on top of the standard, and that layer covers one end of the cable.

The card survived by luck, not by design

The good outcome in this case deserves to be stated for what it is.

A 96GB professional Blackwell card worth around $16,000 survived because the failure happened to originate at the supply end of the cable, and because the PSU-side socket absorbed the damage rather than the card-side one. VideoCardz says as much: luckily, the failure occurred on the supply side, so the expensive card survived.

That is a reprieve, not a design outcome. The same product pairing failed on the card side in March and the card survived that time as well, which tells you something about how variable these failures are rather than anything reassuring about either design. The thermal event that destroys a card and the one that only ruins a cable are the same physics at different locations, and which end it picks is not something the owner controls.

There is also a plain asymmetry worth naming. The supply is a replaceable component. The card is not. So every incident in this family is a lottery on which end fails first, and the cost distribution is heavily weighted against the outcome people care about.

What nobody has said yet

Three things are conspicuously absent from the available reporting, and none of them should be filled in by inference.

ASRock has not commented on the sensor placement question. Whether TempGuard is specified to monitor one end by design, or whether monitoring both was considered and rejected, changes how this should be read. We do not know which.

The power supply's fate has not been reported. The cable melted into the PSU socket, which implies damage to the supply itself. Whether the unit is replaceable, whether ASRock is replacing it, and whether the owner has a claim on a 1650W ATX 3.1 supply are all unaddressed. In the March case ASRock replaced the cable; what happened to that supply is not recorded.

No independent test of TempGuard exists that we can find. The claim that the technology should shut the system down on an unsafe temperature comes from reviews as summarised by VideoCardz, without a named test. We have not located a controlled measurement of the feature working, which is the missing half of the story. A protection feature that has only been observed failing is not the same as one that has been shown not to work.

FAQ

What happened to the RTX PRO 6000 in this incident?

The graphics card survived. The 16-pin connector melted into the socket on the power supply side of the cable, and the RTX PRO 6000 Blackwell Workstation Edition was reportedly undamaged. The owner described the card as worth around $16,000, which is fortunate given the failure occurred at the supply end rather than the card end.

What is ASRock TempGuard?

A feature on the Taichi TC-1650T's two native 12V-2x6 cables, using an NTC temperature sensor integrated into the cable. Per ASRock as reported by VideoCardz, it monitors temperature and signals the supply to shut the system down when temperatures exceed the intended operating range.

Why did the protection not stop it?

Because of where the sensor is. ASRock places the NTC at the VGA connector, which is the graphics card end of the cable, and this failure occurred at the power supply end. The reporting user states the protection did not react before the connector melted, which we cannot verify independently, and VideoCardz's assessment is that a sensor at both ends would likely have prevented it.

Is this the first time these cables have failed?

No, and it is the third reported incident involving this design. VideoCardz previously reported the same TempGuard design failing to shut down a system after an RTX 5090 connector melted. In March, an RTX PRO 6000 owner reported the same cable and supply combination scorched on the graphics card side, with PNY inspecting and returning the card and ASRock replacing the cable. That earlier case had no photographs and remains unverified.

Does this mean the 12V-2x6 standard is faulty?

That is not the claim. The connector was introduced with ATX 3.0 and 3.1 to address exactly this problem, and the cable here was fully inserted at both ends, which is the condition the standard is designed to reward. The narrower point is that an ATX 3.1 cable with an added thermal sensor covers one end of the cable rather than both.

Why does the card surviving not mean the design worked?

Because which end of the cable fails is not something the builder controls. The same product pairing failed on the card side in March and on the supply side this time. The supply is replaceable and the card is not, so every incident in this family is a lottery on where the thermal event originates, and the cost distribution is heavily weighted against the component people care about.

Bottom Line

The detail that matters in this story is not that a cable melted. It is where the sensor was. ASRock's Taichi TC-1650T ships ATX 3.1 cables with TempGuard, an NTC sensor meant to detect an unsafe temperature and shut the system down before the connector deforms, and ASRock places that sensor at the VGA connector, which is the graphics card end. This failure happened at the power supply end, so the monitor was at the far end of the cable from the problem. VideoCardz's conclusion is that a sensor at both ends would likely have prevented it, and that is a small hardware change with a large consequence: one thermistor in a cable assembly saves cost, two cover both failure sites. The design as described protects against a failure mode it cannot see. It is also the third reported incident on this design rather than the first. The same TempGuard arrangement previously failed to shut down a system after an RTX 5090 connector melted, and in March an RTX PRO 6000 owner reported this exact card and supply combination scorched on the card side instead. So the product pairing has now failed at both ends of the same cable, and the protection did not visibly act in the one case with photographic evidence. Two of the three reports are the same pairing, which makes coincidence a less comfortable explanation. The good news deserves stating for what it is. A 96GB professional Blackwell card rated at 600W and worth around $16,000 came through intact, and the reason is that the melt originated at the supply end. That is a reprieve rather than a design outcome, because the supply is replaceable and the card is not, so every incident in this family is a lottery on which end goes first. It is worth remembering that the cable here was fully inserted at both ends, which rules out the partial-seating explanation and makes this a harder case than a badly fitted connector. And it sits awkwardly against the specification, because the 12V-2x6 exists as the standardised answer to connector melting, so a failure of a cable built to the standard is more uncomfortable than a generic bad part, even though the narrower claim is only that an added sensor covers one end. Three things are missing and should not be filled in by inference. ASRock has not said whether monitoring one end was the design intent or a rejected alternative. The fate of a 1650W supply with a socket melted into it has not been reported, and in the March case only the cable is known to have been replaced. And no controlled test of TempGuard working has been located, which is the significant gap, because a protection feature observed only failing is not the same as one shown not to work. On sourcing, this is a single report: photographs from a forum user, relayed by an outlet, with the load-bearing claim about the protection not reacting attributed to the person who owned the hardware rather than independently confirmed.

Source: VideoCardz, ASRock PSU thermal protection fails to prevent melted 16-pin cable on $16,000 RTX PRO 6000 GPU by WhyCry, September 13, 2026, sourced from a report by u/ScientiaEtRatio91 in r/pcmasterrace, and drawing on VideoCardz's earlier reporting on the RTX 5090 TempGuard failure