Updated from 3x3090(2x3090, 1x3090TI) to 2x5090

Upgraded from 3x RTX 3090s to 2x RTX 5090s on my homelab server and picked up a solid speed jump on top of it from a software update (speculative decoding + NVFP4).

Setup: llama.cpp (build b11216), running Qwen3.8-27B (abliterated, Q8_0).

Blue = old 3090 setup,
green = new 5090 setup on the same Q8 model,
teal = the 5090s again after switching to NVFP4 + speculative decoding.

For colorblind folks, the order is: 1 - 3090, 2 - 5090 Q8, 3 - 5090 with NVFP4.

One caveat on the "before" numbers: one of the three 3090s was on a slower PCIe slot than the other two, so that setup was running a bit below what 3x 3090s on equal slots would do.

Overall, very satisfied. I bought 2 prebuilt PCs for $6.4k each when the 5090 went up to $7.5k, 2 weeks ago or so. I really wanted to upgrade to 5090s for a long time for NVFP4 support. The plan is to sell the 3090s for $2k each or so. It would probably be another 2-3 months until they go up that high, but I expect that they will. So, with the prebuilts' leftover components and the 3090s, in the best-case scenario I expect to get back $9k, so the total cost of the GPUs would be about $6k after taxes, which is still nuts and more than the 5090's MSRP.

Ask me any questions, or if there are any other benchmarks you guys want me to run, let me know and I will.