Homelab upgrade: 2x RTX 5090 with NVFP4 + speculative decoding beats 3x RTX 3090
CompetitiveDraft9381 · reddit · 2026-09-28
A homelab user upgraded from 3x RTX 3090 to 2x RTX 5090 and benchmarked the same Q8 model across three setups: old 3090s, new 5090s, and 5090s with NVFP4 plus speculative decoding, with clear speed gains. Buying two $6.4k prebuilts when 5090 hit $7.5k and reselling the 3090s at $2k each, he expects a net GPU cost of about $6k. He caveats that one 3090 sat on a slower PCIe slot and invites further benchmark requests.
More from Infra
- Berkeley's TRACE robots trace monochrome data center cables via bidirectional tracing — berkeley_ai · 2026-09-28
- Brookings paper: US AI buildout to cost $10.3 trillion through 2032, 3.6% of GDP yearly — alex_verem · 2026-09-28
- Kokoro-82M: tiny open-source TTS model runs on CPU with quality of far larger models — solyarisoftware · 2026-09-28
- India's Sarvam AI can now host American AI models on its own infrastructure — rvp · 2026-09-28
- MoEspresso runs Qwen3.8-Flash-Next (125B) at 12-15 tok/s on a 2021 32GB M1 Max — marcobaldo · 2026-09-28
- Polymarket puts 24% odds on a US state enacting a data center moratorium this year — Polymarket · 2026-09-28