https://purinda.com/tags/homelab/ Recent content in homelab on Purinda Gunasekara Hugo en-AU Thu, 29 Oct 2026 22:45:00 +1100 https://purinda.com/posts/underclocking-rx-7900-xtx/ Thu, 29 Oct 2026 22:45:00 +1100 https://purinda.com/posts/underclocking-rx-7900-xtx/ A 7900 XTX serving a 27B LLM drew 315 W at full load. The VBIOS floor is 283 W, the firmware refused to pin clocks, and the whole story turned on one property of the workload: the card is memory-bandwidth-bound. 315 W to 283 W, the junction 91 °C to 83 °C, and one token per second off.