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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1328

post #13271 of 38704
Quote:
Originally Posted by KaRLiToS View Post

I want to know how to reach a stable overclock with that much video cards? Should I overclock them individually first . Like overclock one and keep the other at stock and then stress test like this. Or I will get scaling issues with the other cards at stock clock and one overclocked. Any Suggestions?
I appreciate your help guys, much better than googling all around.

This. However, this will be a long process and I recommend you switch to rc11 drivers while testing. They are the best at overclocking stability imo and have the least issues with powerplay compatibility with AB.

Anyways, it's time to use those pcie switches on the ROG. Run one at a time by disabling the other lanes. Find the limits of each card. The weakest card will be the limit of your array. It's also a good time to run the latest version of prime95 with avx support. Running quads will tax your cpu and the IMC like hell.
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post #13272 of 38704
Quote:
Originally Posted by tsm106 View Post

This. However, this will be a long process and I recommend you switch to rc11 drivers while testing. They are the best at overclocking stability imo and have the least issues with powerplay compatibility with AB.
Anyways, it's time to use those pcie switches on the ROG. Run one at a time by disabling the other lanes. Find the limits of each card. The weakest card will be the limit of your array. It's also a good time to run the latest version of prime95 with avx support. Running quads will tax your cpu and the IMC like hell.

But when he uses all 4 cards and the latest drivers, his overclocking results might be useless as the scenario has changed massivly.
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post #13273 of 38704
Quote:
Originally Posted by BradleyW View Post

But when he uses all 4 cards and the latest drivers, his overclocking results might be useless as the scenario has changed massivly.

Wrong.
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post #13274 of 38704
If I can do 1250Mhz core, I will be more than happy. I will be testing the cards this week and get back to you with my results, thanks guys
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post #13275 of 38704
1250 is easy not too difficult with current yields. Just max the voltage. Your cards will never actually hit 1.3v. Most you can hope for is 1.28v on the lowest asic card, and you'll be praying for more volts on your high asic cards.
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post #13276 of 38704
Find the max clock on each card invidualy then set all cards at the lowest max clock and then set the voltages diferent.
example:
1.1300mhz at 1.25V
2.1300mhz at 1.3V
3. 1250mhz at 1.275V
4. 1275mhz at 1.2V

U set all those clocks to 1250mhz and lower the voltages down. And the one with lowest voltage should be in your first slot:)
post #13277 of 38704
Hello.
I'm thinking of getting a 7950 but i'm not sure which one. This are my options:

ASUS HD7950-DC2-3GD5
SAPPHIRE HD7950 3G GD5 OC FULL
And
SAPPHIRE HD7950 3G GDDR5
SAPPHIRE HD7950 3G GD5 FULL
I'm not sure what the difference aside from 10$ is for the last two.

I hear there is some problems with the Asus one, something chipset connection. Should i go with the Sapphire?
I'm looking for some mild over 1-1.1ghz clocking if that matters.
Edited by smokyexe - 7/12/12 at 6:35pm
post #13278 of 38704
LoL my gpu is sooo defective... now it wont clock higher then it's idle clock of 501mhz core lol...
    
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post #13279 of 38704
Quote:
Originally Posted by smokyexe View Post

Hello.
I'm thinking of getting a 7950 but i'm not sure which one. This are my options:
ASUS HD7950-DC2-3GD5
SAPPHIRE HD7950 3G GD5 OC FULL
And
SAPPHIRE HD7950 3G GDDR5
SAPPHIRE HD7950 3G GD5 FULL
I'm not sure what the difference aside from 10$ is for the last two.
I hear there is some problems with the Asus one, something chipset connection. Should i go with the Sapphire?
I'm looking for some mild over 1-1.1ghz clocking if that matters.

I've heard nothing but good things about the Sapphire 7950s (Including my own from personal experience, the first non-ref edition thumb.gif ). I would say you can't go wrong there... I ordered an ASUS DC2 7950 open box from the egg last night so I'll have more to add personally soon, however, I did read before that people were having issues with the VRMs heating up (don't remember if that was 7970 only...) and whether or not the voltage is locked for the 50s like the 70s are.

tl;dr, Sapphires seem to be really desirable due to their performance, currently.
post #13280 of 38704
I dream of a day where I can have unlocked voltage at 1.5v biggrin.gif
    
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