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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 504

post #5031 of 38701
Hi all,

After some reading and searching, does anyone know the performance difference between a 7950 OC'd and 7970 OC'd? I read a review of a 7950 max OC'd v. 7970 factory OC'd, and it showed 7950 within a few percentages of the 7970 at all points. Just wondering if the step up to 7970 is worthwhile at max overclock.

I will be on air, not water.
    
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post #5032 of 38701
Let's just say this. An OC'ed 7950 can EASILY reach stock 7970 performance. So just that performance increase, and throw it on top of a 7970.

Personally, I decided to just get a 7950 and OC it pretty high.
Edited by Invisible - 2/26/12 at 10:39pm
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post #5033 of 38701
Quote:
Originally Posted by Invisible View Post

Let's just say this. An OC'ed 7950 can EASILY reach stock 7950 performance. So just that performance increase, and throw it on top of a 7970.
Personally, I decided to just get a 7950 and OC it pretty high.

Agreed. I got the Gigabyte Windforce 7950 and it has stellar cooling on it which lets you take this card to crazy levels while being almost silent and extremely cool to boot. I weighed the pros and the cons of each card and I figured the difference between them was better spent somewhere else as I can get better than 7970 (stock) performance out of this card. Hell I am clocked at 1200/1650 and still have headroom on the voltage and the max temps on this card (using 1.225v of a possible 1.3v and never going over 62C even in the most demanding and prolonged situations), but for now it is more than enough.
Edited by Exostenza - 2/26/12 at 10:37pm
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post #5034 of 38701
I haven't been up with the thread lately. What are the best water blocks for ref 7970 so far? I like EK's and XSPC's
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post #5035 of 38701
Got my 7970 PowerColor last week. ASIC quality is 72.4% The card is stable in any game and OCCT/Kombustor at 1125 MHz @ 1.174 V but with some artifacts in Crysis 1/ Warhead. Didn't try higher clocks yet. Absolutely stable modes with no artifacts in Crysis:

800 MHz 0,918 V
900 MHz 1,000 V
1000 MHz 1,081 V
1100 MHz 1,187 V

Will try to find max stable core clock for benchmarking today. But it's useless anyway. Also it's important to keep an eye on VRM temps - 1.175+V is dangerous at full load with power limit +20% (in Kombustor and other furmark-like stress-tests) as the temperature reaches 90+ celcius in 2-3 minutes even with 100% fan speed.

All voltages according to MSI Afterburner.
Edited by eikei - 2/27/12 at 2:37am
post #5036 of 38701
Quote:
Originally Posted by tanton View Post

I haven't been up with the thread lately. What are the best water blocks for ref 7970 so far? I like EK's and XSPC's

I assume they are all good, goes down to personal preference.
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post #5037 of 38701
Quote:
Originally Posted by tanton View Post

I haven't been up with the thread lately. What are the best water blocks for ref 7970 so far? I like EK's and XSPC's

I put the EK Acetal/Copper on mine and will be ordering another for my 2nd card. Block looks great, installs great, and temps are insane. 27c/42c idle/load
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post #5038 of 38701
I swear, if sapphire doesnt come out with their superclocked non ref 7970s a cebit i am going to jump off a bridge lol. I know that the cards out now can overclock extreamly well, but i plan on doing trifire 7970(the money is burning a hole in my pocket) and want to be able to clock all 3 at 1300/1700 + for ultimate domination. Lol.
     
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post #5039 of 38701
Quote:
Originally Posted by jomama22 View Post

I swear, if sapphire doesnt come out with their superclocked non ref 7970s a cebit i am going to jump off a bridge lol. I know that the cards out now can overclock extreamly well, but i plan on doing trifire 7970(the money is burning a hole in my pocket) and want to be able to clock all 3 at 1300/1700 + for ultimate domination. Lol.

Holy cow. That's about 2100 dollars on gpu's and water blocks! I wish I had your money!
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post #5040 of 38701
Can someone help me with a guide or something in how to OC my gigabyte 7970 past 1200 core and 1650mhz memory?

Core V is 1187 stable with 20% power limiter in extreme kombustor.
Memory is 1637 also stable at 20% in extreme kombustor.

I have room for the core but not the memory, I'd like to get a good 10% more increase until I get two more 7970's with my new mobo, then I'll scale back slightly.

Thanks.

Edit I've never done any BIOS flashing etc, so I'd like to keep it simple. I'm running a 64bit windows 7.
    
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