Reply 20 of 26, by vvbee
Jackal1983 wrote on 2022-03-03, 04:49:vvbee wrote on 2022-03-02, 04:30:
With a K6 300 (bottlenecking), I've seen temps reduced by up to 4 C load and idle by downclocking from 143 to 100 MHz, with 0-5% loss in performance up to 800 x 600 (tested in Quake 3, Need for Speed 5, 3DMark 99). So not a big reduction in temps, but also no clear benefit in running the card full blast.
Thanks, that kind of data was what I was curious about. Between that honking huge aluminum heatsink that came attached to the chip and an underclock I should get a decent reduction in temps. Hopefully I'll get a decent temp drop over that mosfet as well.
Probably due to the CPU limiting the GPU, it ran relatively cool even without underclocking, with a case fan bringing in air across the card. Under load, the PCB behind the core peaked at 22 C above ambient, the surface of the MOSFET 16 C, and the surface of one of the VRAM chips 9 C.
This was the Voodoo 3 2000.