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Need a little help with my crossfire, and trying to overclock - Page 2

post #11 of 16
Quote:
Originally Posted by Munchkinpuncher View Post

I wouldn't recommend syncing similar settings for your GPUs if they are using different voltages, because that will cause one to use the same voltage as the other card which can result in instability. (unless they have changed this with the most recent build of afterburner)

I would recommend putting on some new thermal paste however because sometimes paste on these cards is not great.

Your top card will be hotter in crossfire because it has the other card heating it up as well. I ended up buying aftermarket coolers for my cards (arctic accelero 7970). If I had to do it again I think I would just water cool the GPUs for all the money I spent on an aftermarket aircoolers.

For some immediate results I think your best bet is to repace the paste on your cards.

My Sapphire uses .950 and my MSI uses .806 idle voltages, but when they both use .950 I have no stability issues, but I agree that it is definetly possible for other cards to. Good suggestion!
Quote:
Originally Posted by raghu78 View Post

CL Liquid Ultra is probably the best TIM you can buy. ask around in the HD 7900 users thread if its safe to use it .

I have used it on both of my cards and have had no problems. It is conductive so you have to be careful applying it and be sure to apply a thin layer that wont spread when the heat sink is put on. Luckily the included brush makes that easy to do. Just takes a little patience.
Quote:
Originally Posted by Niexist View Post

I did use the arctic silver I had already purchased, now I'm running at load with 100% fan at 76-77 degrees. A ten degree difference is quite pleasing, My bottom is running at around 55 under load should I redo that one too even though it is so much lower?

No need to replace it now. I still would recommend getting some CLU for both GPU's because once you go further into overclocking those extra degrees will help stabilize your OC. Remember, the cooler your cards are, the longer they will live. 55 is a great temp under load though.

Did you go any further into your overclock?
Edited by RavageTheEarth - 3/17/13 at 9:10pm
post #12 of 16
Quote:
Originally Posted by RavageTheEarth View Post

My Sapphire uses .950 and my MSI uses .806 idle voltages, but when they both use .950 I have no stability issues, but I agree that it is definetly possible for other cards to. Good suggestion!

It would be nice if they kept the voltage the same yet synced the other settings for overclocks. I have one card that is .943 and the other 1034. When they are running at their full overclocks the voltage difference is pretty significant, with one card resulting in not getting enough vcore.
Some nice low voltage cards you have there. thumb.gif

To the OP: 10c drop for re applying thermal paste is well worth it, great success!
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post #13 of 16
Thread Starter 
I did overclock a little bit I'm looking for something stable for all the different games I play. Right now I'm doing 1.225v with 1135/1450. Here is the problem that is really noticable with the card when I took it apart.

There is NO VRM cooling or anything, there is actually a gap between them and powercolor portion of the GPU with the fans etc. So with this overclock I was reaching around 79-80 core temp, but 83 VRM temp!! From what I understand your VRM temp should be lower than your core temp not the other way around!

Is there anything I can do to alleviate this problem? Also would an arctic accelero xtreme, or hybrid fit on my GPU in place of the powercolor cooler? I really like the look of the powercolor one but no VRAM/VRM cooling is starting to be a noticable issue.
Edited by Niexist - 3/18/13 at 10:11am
post #14 of 16
Thread Starter 
bump, is there anyway to cool my VRM? It is running 5-6 degrees hotter than my GPU...
post #15 of 16
Quote:
Originally Posted by Niexist View Post

bump, is there anyway to cool my VRM? It is running 5-6 degrees hotter than my GPU...
thermal tape, or buy aftermarket cooler with vrm heatsinks.
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post #16 of 16
Thread Starter 
Aftermarket coolers won't fit because I believe the board is different in some way, this is why it is near impossible to set up a watercooling system for it. As far as thermal tape, can you make a recommendation for a youtube video or something showing me how to do the application?
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