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Asus Hd6950 Direct CUII

post #1 of 6
Thread Starter 
I recently built a new gaming rig, and decided to opt for a pair of Asus HD 6950 direct CUII cards in crossfire. Upon initial installation ,the cards seemed fine, but it soon transpired that these 'amazing' coolers weren't all they were cracked up to be!

My Idle temps were as follows...

Top card...



Bottom card...









So out of curiosity, I decided to remove the sinks from the cards...



This is what the sinks looked like, and as you can see, the mating surface was very uneven (notice the ridges in the heat pipes), and it definitely needed some work!




I decided to use a flat, honing stone to lap the surface and I didn't spend a lot of time on it, but here is the result of the first lapping job...




As you can see, the difference was quite substantial, so I continued to lap the second card in the same manner, and after installing the cards, I observed the following temperatures...


Top card



Bottom card...




Now far be it from me to say that my Asus cards weren't as good as they could have been, but the 'before and after' temperatures were taken within an hour of each other at similar ambiant temperatures... so I'll let you make up your own mind after that!


I now have both GPU's on custom water blocks, and running extremely low temperatures, but on stock coolers running furmark, the highest temperature the top card reached, was 69 deg C, whereas I've heard of people reaching 90+ degrees with the same cards!

Decide for yourself whether it's worth the effort or not!
Edited by The Doc - 10/23/11 at 10:15pm
The Beast
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The Beast
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post #2 of 6
Wow good job with the heatpipe lap job! I've never done one of those before on a graphics card. Plus rep for you sir!
post #3 of 6
Nice camera BTW. What is that, a macro lens?

Seems like the egg reviews were right. If they're gonna use a 3 slot cooler, Asus needs to use flatter heatsinks and better thermal compound.
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post #4 of 6
who did you water blocks? I would love some water love for my tf3 6950
post #5 of 6
Nicely done sir.
Verktøy Cu
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Verktøy Cu
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by Farmer Boe View Post
Wow good job with the heatpipe lap job! I've never done one of those before on a graphics card. Plus rep for you sir!
Thank you...
To be honest, I couldn't that believe the Asus HD 6950 Direct CU II was offering such a minutely incremental upgrade against its rivals... which is why I thought I'd try to document why/how it could be better!

Quote:
Originally Posted by brucethemoose View Post
Nice camera BTW. What is that, a macro lens?
I'd like to say I was using a more substantial lens, but this is probably one of the cheapest lenses in the Nikon range... it's the 18 - 55 DX, and it happened to be on the camera purely by accident... but don't get me wrong, it's still a great lens, Here's an example shot of the GPU...



Quote:
Seems like the egg reviews were right. If they're gonna use a 3 slot cooler, Asus needs to use flatter heatsinks and better thermal compound.
There are many more problems with the Asus Direct CUII cooler than I am not prepared to discuss here. If anyone wants to know the REAL problems with it, PM me

Quote:
Originally Posted by hammertime850 View Post
who did you water blocks? I would love some water love for my tf3 6950
I designed/built the water blocks myself. I decided I couldn't wait for a company to release water block for these non-reference boards, so I designed and built my own. I have been approached by two campanies asking if I'd sell the rights to one of the coolers (the 6950), but we're still in negotiation, so I unfortunately, I am unable to comment further, although this may soon change...

Quote:
Originally Posted by derickwm View Post
Nicely done sir.
Thank you... appreciated
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