Re-enable compute – Cryptomining-era BC-250 boards shipped with much of their GPU compute disabled, but a Linux patch described in a project README suggests those units can be re-enabled during GPU driver initialization. One Bazzite Linux demonstration reportedly shows all 40 com
For people who kept a BC-250 crypto mining card around after the market cooled off, the main frustration was simple: the board’s GPU compute units weren’t fully on. The hardware based on Sony’s PlayStation 5–like custom APU had been sold with parts deliberately disabled—by design, not by accident.
The BC-250 traces back to APU architecture found in the PS5. but with an important difference: two out of eight CPU cores are disabled. and many compute units (CUs) inside the iGPU are also turned off. Around 2023. these boards appeared in cryptomining setups—an era when manufacturers often shipped silicon with some functionality held back to boost yield and reliability.
Now, an approach shared in the project README suggests those CU limits aren’t meant to be permanent. The boards come with only 24 out of 40 CUs enabled, but the README describes that it’s not an e-fuse lock. Instead, the change is handled by writing to two hardware registers during GPU driver initialization. Those register writes can then be extended through kernel module parameters, including in Linux.
The reason for the disabled units is probably familiar to anyone who has followed semiconductor production: some APUs may have failed QA during PS5 APU manufacturing. leaving “defective” CPU cores and compute units marked as unusable. But the PS5-style silicon story has a recurring twist. Sometimes the label is wrong. or the margin is thin—like the older case of an AMD Phenom II X3 where a supposedly bad fourth core turned out to be usable. With that kind of history, there’s a real chance that not all disabled CUs are truly bad.
That’s the gamble the project’s author, [duggasco], appears to be inviting—along with anyone else willing to tinker. The demonstration comes from [Lowest Logan], who ran the patch on a BC-250 system using Bazzite Linux. After a reboot, the system reportedly listed 40 compute units as enabled.
The next step was stress-testing. Running Furmark showed a big performance boost without any glitches or fire. the kind of phrase PC enthusiasts don’t forget because it captures the fear that typically accompanies “unlocking” hardware. Thermal throttling did appear. but the explanation was straightforward and practical: the default cooling solution wasn’t designed for sustained full-load operation.
There’s also a PS5-specific detail that makes the whole thing sting a little—in a good way. The real PlayStation 5 has only 36 active CUs, meaning these unlocked BC-250 APUs can, in theory, run at a higher CU count than Sony’s console.
In the proof-of-concept, swapping to a water cooling solution resolved the thermal throttling during full blast testing. The net result is less a promise and more a door you can walk through: with the right cooling and the right silicon lottery. older cryptomining hardware can be turned into something closer to a capable gaming machine.
For the people sitting on BC-250 boards that were never fully utilized, the message is clear. The “disabled” compute units weren’t necessarily the end of the story. They may have been the beginning.
BC-250 PS5 APU cryptomining card compute units GPU driver initialization Linux kernel module parameters Bazzite Linux Furmark thermal throttling overclocking