Please talk me out of this GPU upgrade

I'm considering replacing a single RTX 3090 with two ASRock AMD Pro R9700s for about 2900 new out of the door. That would move me from 24GB to 64GB VRAM. Yes yes, CUDA/ROCm, but the real problem is power connector shenanigans. I run the 3090 at a 250W power limit today, because one of the 8 pin connectors is adapted from a 6 pin connector. With the R9700s, I'd somehow have to adapt an 8 pin and a 6 pin into the required 16 pin adapter (or else find if Lenovo has FRU parts to replace the 6 pin cables with proper 8 pin parts, and the power distribution to match, which makes the adapter problem easier). It also relies on being able to significantly power limit the AMD cards, which I'm not totally sure if I can do. 2900 for 64 GB VRAM is feeling very attractive, but I also feel like I shouldn't open this can of worms. Right? submitted by /u/milkipedia [link] [comments]

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Source: r/LocalLLaMA | 2026-08-07