Lol. I just tried my VRM temps again as well after they overheated during a few hot ambient days here.
For the ones that didn't read that: Using a reference 7970 with a Accelero 7970 - fan module and with 2 Slipstream 1600RPM fans tied to it.
VRM sinks of Arctic are just way too small, and the thermal tape self-mix goo is rather bad as well. With a voltage of 1.243v and 1230Mhz core, 1.625v VRAM and 1700Mhz VRAM I hit well over 100c in BF3.
Also, Heaven 3.0 on all max could pull it pretty high, but not as high as BF3. Current load was about 140-160 amps in BF3 max.
Tried them at those clocks again now that ambients are back to 20~ish deg. celsius. Roomtemp was like, 21c now.
Ran Heaven, somehow VRM's stayed REAL cool, only 66c for VRM1 and 54c for VRM2 in GPU-Z. Current draw was pretty low, only averaging about 124 amps.
So, I decided to REALLY test them with something that pulls EVEN MORE amps and load then Furmark does. OCCT.
That managed to pull a figure well over 200 amps quite easily with the average current being about 223 amps. (VDrop was quite extreme, it did artifact lightly due to it)
Well, that load on the VRM's caused VRM2 to behave very normally and slowly go up to about 65c and staying there, but VRM1 just SHOT up like a rocket and within 60 seconds it had reached 105c and seemed to stabilize there but no, every 5 seconds it would climb a degree and every 4-5 degrees VDrop increased till the point OCCT just died with the VRM1 temp at about 128-130c.
So, This Arctic heatsink is VERY good in terms of core temps, only 65c even with 200+ amps (240-260w) on it, but the VRM sinks are severely worthless. I'm going to find a way to cool them better.
Please post if you find a solution. I also have the accelero on a ref 7970. The highest I hit was 90deg on VRM's but that was w/out upping the voltage (1.174). To keep them down I undervolted to 1.150 and they stay below 70deg but limits my overclock.