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Sapphire Dual-X 7970 Sweltering hot VRMs and core throttling.

post #1 of 3
Thread Starter 
I had this card for about a month, it's impossible to overclock. Its a boost card that comes at 950mhz and boosts all the way to 1000mhz!! When I set the core above 1000MHz manually it throttles to 950MHz after a very short while. When I increase the voltages to 1.206 it takes longer to throttle but the VRMs go up 15c. With the voltages at 1.212 it only throttles once the the VRMs hit 103c.

I am not afraid to open this card up and replace thermal pads and paste however it looks like Sapphire did not use an actual heatsink on the VRMs but instead placed thermal pads between the VRMs and a support bracket. I am also thinking of writing a non-boost bios locked at 1000MHz to bios 2 if that would stop the throttling to 950MHz.

Most reviews I read on this card have people overclocking with much more ease but i'm just starting to think mine is garbage.
post #2 of 3
You may have better luck by notching the Dual-X heatsink and placing a secondary smaller heatsink on the VRMs rather than relying on the support bracket. I has a MSI TwinFrozr 7950 that did the same thin with the RAM and even that got too hot. It also might be worth it to place a fan right at the side of the card to cool it off a bit to make sure your problem is VRM temp related. Good luck
post #3 of 3
Thread Starter 
I might try this shroud with a decent fan inside but im not sure that cooling would even reach the VRMs, definitely not the VRM on the other side of the card.
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