cirthix
12-10-2006, 01:46 AM
First of all, do this at your own risk, blah blah blah. Anyway, I decided to hlep us x1900 users save a bit of power. Such high clocks really arent needed in 2d mode, so I reduced them.
I used an x1900xtx toxic bios, 512mb samsung 1.1ns, 675/800 3d, 530/600 2d
modified to: 675/800 3d, 310/500 1.075v 2d, with xt timings (VERIFY THAT YOUR CARD CAN DO THIS), changed fan speed settings and thermal limits to be quieter in 2d and cooler in 3d. thermal limit set to 90c in both 3d and 2d. I just had an x1800xt die because of overheating, it's worth the extra safety. You shouldn't be running cards at 90c anyway
It seems that modifying the 3d speeds in bios does not work and resets the rest of the bios to stock, otherwise I would have raised them a bit.. Core/mem speeds do change properly, according to load, and the bios works ok for me. bios is attached, enjoy a bit of reduced noise :)
Unfortunately, the vrm doesnt seem capable of delivering lower than 1.05v properly. such was the case with my x1800xt card as well (same vrm).
an interesting update: I was wrong on the vrm not being able to operate at such low voltages. dvi seems to blank out lower than that on the bios screen and when setting resolutions sometimes. I'm not sure what's going on exactly. I had to switch to vga to change bios settings. I can leave the bios as it is or raise the voltage a bit. lmk if you'd like me to change it.
little update: even with very little airflow over the vrm area (wc), it is running MUCH cooler than it was with the stock bios. ATITOOL is handy for the monitoring graphs :)
quick result: http://service.futuremark.com/compare?2k1=9106825
I used an x1900xtx toxic bios, 512mb samsung 1.1ns, 675/800 3d, 530/600 2d
modified to: 675/800 3d, 310/500 1.075v 2d, with xt timings (VERIFY THAT YOUR CARD CAN DO THIS), changed fan speed settings and thermal limits to be quieter in 2d and cooler in 3d. thermal limit set to 90c in both 3d and 2d. I just had an x1800xt die because of overheating, it's worth the extra safety. You shouldn't be running cards at 90c anyway
It seems that modifying the 3d speeds in bios does not work and resets the rest of the bios to stock, otherwise I would have raised them a bit.. Core/mem speeds do change properly, according to load, and the bios works ok for me. bios is attached, enjoy a bit of reduced noise :)
Unfortunately, the vrm doesnt seem capable of delivering lower than 1.05v properly. such was the case with my x1800xt card as well (same vrm).
an interesting update: I was wrong on the vrm not being able to operate at such low voltages. dvi seems to blank out lower than that on the bios screen and when setting resolutions sometimes. I'm not sure what's going on exactly. I had to switch to vga to change bios settings. I can leave the bios as it is or raise the voltage a bit. lmk if you'd like me to change it.
little update: even with very little airflow over the vrm area (wc), it is running MUCH cooler than it was with the stock bios. ATITOOL is handy for the monitoring graphs :)
quick result: http://service.futuremark.com/compare?2k1=9106825