Overclocked watercooled 5970 - initial results

[britboy4321]

OK well got reasonably far on my 5970 overclock tonight.

Here is how far I got before instability started to creep in:

Which is pretty good (furmark was stressing the card). As you see, the car is still only running at 50 degrees -- so I think the VRMs are overheating.

I think there is further to go .. but am considering my options (or more specifically, how I can verify the VRMs are the problem) ...

 

[Jokester]

Core probably needs more voltage to go further.

 

[Trunks9486]

I think everest reports vram temps.

Does the water block cool the VRMs?

 

[fornowagain]

so I think the VRMs are overheating.

Why do you think that? They can get pretty hot before throttling, underwater I doubt they're that hot. Stock voltages? More likely it needs some core voltage. Of course that WILL increase the VRM temps even more.

I think everest reports vram temps.

Not sure on 5970, but so does gpu-z and AMDGPUtool with 5870.

Does the water block cool the VRMs?

Full cover block, so yes.

For reference, 5970 with an EK block (too much vcore tbh).

 

[Ardbeg]

Nice! Keep us updated! ...it may even sway me to watercool mine.

I've managed 900 core (1.15v), 1370 memory (stock volts) but it bangs off 88 deg C in fur mark with the stock cooler.