Reviewer tests 'RTX 4080M' desktop graphics card powered by salvaged laptop silicon — performs worse than slightly more expensive RX 9070 GRE but draws only 100W in games

A Chinese reviewer on Bilibili by the name of 杰某 (Jie Mou) got his hands on a special RTX 4080 graphics card that uses a mobile core instead of a desktop one. These GPUs emerged after the Trump admin banned the sale of RTX 4090s in the region, which forced local sellers to resort to strange alternatives, one of which is the supposed "RTX 4080M." It's a custom, modded GPU that doesn't come with a warranty or official drivers, and the benchmarks show it doesn't offer world-beating value either.

The reviewer paid 2,000 RMB (~$300) for the tested card but remarks that it now costs close to 2,700-2,800 RMB (~$400) due to the ongoing component crisis caused by the AI rush. At that price, it's almost as expensive as AMD's RX 9070 GRE or Nvidia's RTX 5060 Ti in China, both of which will be brand new, warrantied cards. However, a similarly-modded RTX 4090M in China would cost an absurd 10,000 RMB (~$1,470).

Before we go over the benchmarks, the test bench used here was comprised of an Intel Core Ultra 270K Plus mounted on a Maxsun Z890-A motherboard alongside 32GB of DDR5-8200 RAM. In 3DMark TimeSpy, the 4080M scored 18,600 points, which is a respectable result in and of itself, but underwhelming when you take its price into account. Someone in the comments showed the same card netting 19,500 points as well.

During the benchmark, the card only pulled around 100W, which is significantly lower than even the mobile RTX 4080's TGP. The mobile core can be pushed up to 175W as per Nvidia's own spec and you'd expect that in a discrete GPU form factor, but it's likely that the custom BIOS or the drivers are holding it back. Speaking of which, the drivers can be easily configured with one-click installers developed by the community.

Moving toward gaming, the reviewer compared the 4080M against the aforementioned RX 9070 GRE because of their similar price brackets in China, and both come packing 12GB of VRAM. PUBG was the only game where the 4080M was clearly superior, achieving a 100 FPS lead over the AMD option at 1440p resolution with Ultra settings. In Delta Force at 1440p Ultra, both cards performed the same, but the 4080M did manage to net 10 more FPS at 4K.

The reviewer then tested AAA titles where the RX 9070 GRE basically smoked the 4080M as the resolution scaled upward. We'll add a table below so you can see the exact numbers, but the closest the 4080M came to dethroning the Red Team was in Shadow of the Tomb Raider. Running at 1440p with Low settings, the 4080M pushed 286 FPS on average, while the RX 9070 GRE still won with 274 FPS.

At the end, the verdict ultimately turns out to be boring: the RTX 4080M is not a sensible purchase at the current Chinese market prices because similarly-priced new GPUs outpace it with ease. However, since it only drew 100W in games, there's an argument to be made for SFF builds. There's limited thermal headroom in an ITX system and that's where the RTX 4080M could thrive.

Nvidia's rich driver suite and superior upscaling tech also add value to the proposition. At roughly $400 converted, perhaps the 4080M can power a DIY Steam Machine that truly undercuts Valve's pricing while delivering much better performance. After all, it's made from salvaged laptop GPUs and qualification samples that are cheaper to acquire, so a MacGyver-ed, console-busting rig is where it can meet its natural match.

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