Originally Posted by Dasboogieman
After some more testing on the Tri OC with 3dmark11 Perfomance:
1150mhz Core/ 1500mhz VRAM +50mv offset +50% power fan speed auto, 20% with ramp to 80%
Gradual throttling in all tests to 937mhz score is 15200 average load temp is 78 degrees
1150mhz Core/ 1500mhz VRAM +50mv offset +50% power fan speed 80%
Full clock stability with 3dmark 11, final score is 16380 average load temp is 72 degrees
1200mhz core/ 1500mhz VRAM +100mv offset +50%power fan speed 80%
Gradual throttling on 2nd test to 1000mhz when AMP draw is >140A score 14999 average load temp is 78 degrees
This is really weird, I thought Sapphire made their card independent of the fan speed impact on the performance envelope. Anyone have ideas?
After more reading, it seems the default BIOS on the 290 is the Silent profile. Is there a chance anyone has an Uber BIOS equivalent for this card? I have a hunch it will remove the throttling issue. Also, how are the watercoolers getting around this issue since theres technically 0% fan speed.
ack Overclocking is so complicated now, and I thought Fermi was a pain in the ass with the Power Limiter.
What program are you using to OC?
Ditch 14.X drivers if you're using them, scrub with DDU so there aren't any driver conflicts and try 13.12.
Whether you use Sapphire Trixx of MSI AB, make sure you disable ULPS and force constant voltage to help with stability. Keep the power limit at 50%.
Your score probably dropped from the 1150 to 1200 run because of additional voltage required. For 1200 MHz core, on air, you may need a little more than +100mV depending on how good of a card you have. Couldn't hurt to try reducing your VRAM clocks; they really are 'second fiddle' to the core on these cards with the ginormous 512-bit bus.
What temperatures for core and VRM1 are you getting during benchmarks? The card shouldn't throttle until it surpasses 95C on the core. Issues seem to rise once VRM1 temps are in the 90C+ range.
If you're running a custom fan profile the BIOS switch setting shouldn't make a difference.
Water cools everything enough to make it more efficient than on air, thus reducing voltage/power requirements. My voltage requirements dropped when I went to water, as well as allowing me to push the card a little further. I run out of overclocking ability of my card before I run into any temperature limits; my card goes up to 1300/1700 with +200mV.
Edited by Roboyto - 4/6/14 at 11:34pm