Sharkoon Rebel P20 Gen 2 750W: Same Gold Efficiency, 140mm Chassis, and None of the Original's Silence

By Indie Kings | September 27, 2026

Updated September 27, 2026: Sharkoon has reworked the Rebel P20 750W, and the interesting part is what the second generation kept and what it gave up. The first generation was one of the quietest power supplies Aris Mpitsos tested in 2024, averaging 9.21 dBA, and the new version drops from Cybenetics LAMBDA A++ to Standard++ at 33.48 dBA. Efficiency is unchanged at Gold on both voltages, the 140mm chassis is unchanged, and the price has come down to €79.90. Underneath, the platform is genuinely different: the primary side moves from full-bridge to half-bridge, and the 12V rail is handled by four MOSFETs instead of six.

Verification note: All figures are from Hardware Busters' review by Aris Mpitsos, published September 27, 2026, testing the Sharkoon Rebel P20 Gen 2 750W against its Cybenetics evaluation. Prices are the manufacturer's suggested prices including VAT as listed in the review and are attributed as such; we have not verified current street pricing and no retailer link is reproduced. The comparison against the first generation relies on the reviewer's own earlier testing of that unit, which he conducted in summer 2024, and both his figures and his commentary on the earlier fan are reported as his.

Image: Sharkoon Rebel P20 Gen 2 750W. Credit: Hardware Busters.

The noise regression, which is the whole story

Start with what the first generation was, because the second is only interesting relative to it.

Aris reviewed the whole original Rebel P20 line in summer 2024 and the 750W was his favourite of it. His reasons were that it was fast, it was compact, and that with an average of 9.21 dBA it was practically silent. He added a caveat at the time that is worth returning to: so quiet that he wondered whether such a lazy fan could hurt its reliability over the long run.

The Gen 2 keeps the Cybenetics Gold efficiency rating at both voltages and keeps the compact 140mm chassis. What it does not keep is the noise.

The review describes the noise change as a big step down, and it plainly is. A++ to Standard++ is a wide gap on the certification scale, and the 230V figure of 34.01 dBA is not a marginal difference from 9.21 dBA average. This is the metric the original was known for and the new one gives it up.

It is worth being careful about comparing those two numbers directly, though. 9.21 dBA was the first generation's average across its load range, while 33.48 and 34.01 dBA are the certified ratings at fixed voltages. Those are not the same measurement, and a fair reading is that the Gen 2 is materially louder rather than that it is precisely four times as loud.

What actually changed underneath

The platform change is real and it is the kind of thing that explains a price drop.

Andyson is the OEM on both generations, but the review is explicit that this is not the same platform with a new label. The primary side switches from a full-bridge to a half-bridge topology, and correspondingly four MOSFETs handle the 12V rail instead of six.

That is a straightforward component reduction. A half-bridge primary uses roughly half the switching devices of a full-bridge for the same function, which reduces the bill of materials, the number of parts to solder, and in principle some of the losses. It is the kind of change that legitimately supports a lower price while holding the efficiency class steady, which is exactly the pattern here: Gold retained at both voltages, price reduced, and noise sacrificed.

The framing question a buyer should ask is whether the noise was a design choice or a side effect. If the fan change and the topology change were made together to hit a price point, then the cheaper unit is the one with the fan that has to work harder, and the cost shows up in what you hear. That is a plausible reading of the specification change rather than something the review states outright.

The fan, and a specification that contradicts the marketing

There is a small contradiction in the product's own documentation that is worth recording, because it concerns reliability.

Sharkoon describes the 120mm fan as a hybrid magnetic bearing fan, and it comes from POWERYEAR, model PY-1225M12S. The technical specification table in the same review lists the cooling as a 120mm sleeve bearing fan.

Those are different bearing types with different characteristics and different expected service lives. A hybrid or magnetic bearing is the premium option, and a sleeve bearing is the budget one. Whichever is correct, the two statements are in conflict and a buyer relying on the marketing description would be relying on the one that is more flattering.

This connects back to the reviewer's own earlier worry. The first generation's 9.21 dBA average left him wondering whether a fan that barely spun could hurt long term reliability. The second generation changes the fan, shrinks it from 140mm to 120mm, and adds a selectable Zero RPM mode. Whatever the new fan is, it is a different fan, and the question the first review raised about long-term fan behaviour has not been answered for it.

What €79.90 buys, and what it costs

The pricing structure is the most competitive thing about this product.

Sharkoon announced the Gen 2 line in August 2026 with three capacities at suggested prices including VAT of €79.90 for 750W, €89.90 for 850W and €99.90 for 1000W, with the 850W also offered in white. The per-watt progression is almost flat, which means the larger models are not priced as upgrades so much as as capacity options.

For a 750W ATX 3.1 unit with a native 600W 12V-2x6, fully modular cabling and a selectable zero RPM mode, €79.90 is genuinely inexpensive, and it is cheaper than the class of units it is competing with on price. Hardware Busters also lists SFX versions of the Rebel P20 in its 850W and 1000W forms, so the family covers small-form-factor builds as well.

What the price buys is therefore a clear trade: a new topology, a new fan, a large noise regression, and retained Gold efficiency at a lower cost. Whether that is a good deal depends entirely on how much you care about the noise, and for a machine that will sit on a desk in a quiet room, the original's specification was the reason to buy this line and the new one no longer offers it.

The specification sheet, including two things worth noticing

The rest of the specification is conventional and unremarkable in the way a well-executed budget ATX 3.1 unit should be.

It delivers 750W on a single 12V rail, with 5V and 3.3V combined at 100W. It is ATX 3.1 compliant with EPS 2.92 and PCIe 5.1 ready, supports alternative low power mode and Intel C6 and C7 power states, and is rated for 0 to 40 degrees C under continuous full load. Cabling is fully modular with tinned copper, and the high power connectors are two EPS across two cables, one 600W 12V-2x6, and three PCIe 6+2 pin across three cables.

Two details in the cable list are worth flagging for anyone planning a build.

First, the 4-pin Molex is 150mm after the last SATA connector, which is short. Peripherals that need a molex at the end of a run will be awkwardly placed, and it is a cost saving that shows up in cable length rather than in a headline figure.

Second, there is only one 4-pin Molex in the entire cable set, against seven SATA connectors across two cables. A machine with a mix of SATA drives and older peripherals may need a third-party cable, which is cheap but is a small irritation that a specification list does not surface.

Dimensions are 150 by 86 by 140mm at 1.26 kg, and the 140mm depth is worth keeping in mind as a deliberate carry-over from the first generation, since it is one of the shorter ATX 3.1 chassis available.

FAQ

How much louder is the Gen 2 than the original Rebel P20 750W?

Materially. The first generation measured 9.21 dBA average and carried a Cybenetics LAMBDA A++ rating. The Gen 2 is rated LAMBDA Standard++ at 33.48 dBA on 115V and 34.01 dBA on 230V. The review calls the drop a big step down. Note that the original figure was an average across loads while the new ones are certified ratings, so the two are not a like-for-like comparison.

What changed technically between the two generations?

The OEM is still Andyson, but the review states it is not the same platform. The primary side moves from a full-bridge to a half-bridge topology, and the 12V rail is handled by four MOSFETs instead of six. The chassis depth stays at 140mm, cabling stays fully modular, and the native 12V-2x6 connector is retained.

Is the fan a magnetic bearing or a sleeve bearing?

The product's own documentation conflicts. Sharkoon describes it as a hybrid magnetic bearing fan, and the fan is a POWERYEAR PY-1225M12S. The technical specification table in the review lists a 120mm sleeve bearing fan. The two are different bearing types with different characteristics, so the marketing description is the one to treat with caution.

What is the price and does it still meet Gold efficiency?

The suggested price including VAT is €79.90 for 750W, with the 850W at €89.90 and 1000W at €99.90, announced in August 2026. It meets Cybenetics Gold at both voltages, measured at 88.027 percent on 115V and 90.139 percent on 230V, which is unchanged from the predecessor.

Are there any cable length problems?

One worth noting. The 4-pin Molex sits 150mm after the last SATA connector, which is short, and there is only a single molex in the whole set against seven SATA connectors. ATX, EPS, 12V-2x6 and PCIe cables are conventional at 600 to 700mm. A build needing more than one four-pin peripheral may require an extra cable.

Is there a zero RPM mode?

Yes, and it is selectable, listed as semi-passive operation confirmed. The unit also supports alternative low power mode and Intel C6 and C7 power states. Worth pairing with the fact that the fan itself has changed from the first generation, where the reviewer's original concern was whether a fan running at such low speed could affect long term reliability.

Bottom Line

The Rebel P20 750W was one of the best power supplies Hardware Busters tested in 2024, largely because at 9.21 dBA average it was practically inaudible, and the second generation keeps almost everything that made it good except that. The noise rating falls from LAMBDA A++ to Standard++, at 33.48 and 34.01 dBA on the two voltages, which the review calls a big step down and which is the metric the original was known for. Efficiency does not move: Gold is retained at both 115V and 230V, measured at 88.027 and 90.139 percent. The 140mm chassis is unchanged, which in a market of longer ATX 3.1 boxes is still a genuine advantage, and the price has come down rather than up. What you are buying at €79.90 is a cheaper machine. The platform underneath is genuinely different rather than rebranded, with the primary side moving from full-bridge to half-bridge and the 12V rail handled by four MOSFETs instead of six, and that component reduction is the most likely explanation for holding the efficiency class while dropping the price. The cost of that approach appears to have landed on the fan, which changed, shrank from 140mm to 120mm and now comes from POWERYEAR. That is a coherent engineering story, but it leaves the second generation competing on price in a category where the first one competed on silence, and for anyone building in a quiet room that is a downgrade regardless of what the efficiency label says. Two details deserve more attention than they are likely to get. Sharkoon describes the new fan as a hybrid magnetic bearing while the specification table in the same review lists a sleeve bearing, and those are the premium and budget options respectively, so the marketing is the more flattering of two conflicting statements and a buyer relying on it would be relying on the wrong one. That matters more here than it otherwise would, because the reviewer's own reservation about the original was that a fan running at 9.21 dBA average might be too lazy to survive the long run. That question is now doubly open, since the fan has been replaced with one whose bearing type is disputed. The second is smaller and purely practical: the 4-pin Molex sits 150mm past the last SATA connector, and there is only one of them against seven SATA connectors, which is a cost saving that shows up in cable length rather than in any headline specification. Set against all that, the price is the strongest thing about the product. A 750W ATX 3.1 unit with a native 600W 12V-2x6, full modularity, a zero RPM switch and a 140mm chassis for €79.90 is hard to argue with on value, and the same family covers SFX at 850W and 1000W. The honest summary is that this is a good cheap power supply that is not a good quiet one, and that if you were buying the first generation for the silence you should know what you are trading away.

Source: Hardware Busters, Sharkoon Rebel P20 Gen 2 750W ATX v3.1 PSU Review by Aris Mpitsos, September 27, 2026, including the published Cybenetics efficiency and noise evaluations and comparison against the reviewer's summer 2024 testing of the first generation

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