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post #11 of 14
I just got mine 7970 Ghz Vapor-X card yesterday. I didn't have much time to play with it at last night, but I tried some core overclocking. I don't know how 7970 behaves under overclocking (yet), so maybe i could ask some quick questions here. What i noticed is that I have lots of artifacts in the heaven benchmark but Furmark and 3dMark 11 runs ok, so does this just indicate that core need's more voltage?
With nvidia cards the drivers usually stops working when you are getting to the limit of clocks, so you really didn't see any flickering, artifacts or other graphical issues when overclocking. Last night i just did get all of those biggrin.gif One time the screen was flickering in the desktop.

So more voltage or less clocks to the core, right?
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post #12 of 14
Quote:
Originally Posted by Paztak View Post

I just got mine 7970 Ghz Vapor-X card yesterday. I didn't have much time to play with it at last night, but I tried some core overclocking. I don't know how 7970 behaves under overclocking (yet), so maybe i could ask some quick questions here. What i noticed is that I have lots of artifacts in the heaven benchmark but Furmark and 3dMark 11 runs ok, so does this just indicate that core need's more voltage?
With nvidia cards the drivers usually stops working when you are getting to the limit of clocks, so you really didn't see any flickering, artifacts or other graphical issues when overclocking. Last night i just did get all of those biggrin.gif One time the screen was flickering in the desktop.
So more voltage or less clocks to the core, right?


Before overclocking check the card for complete stability at stock speeds. First test the apps like BF3, Crysis 2, Heaven 3.0, 3D Mark 11 at stock speeds. once you have confirmed its stable you can overclock. yeah artifacts mean the overclock is unstable. what clock speeds were you running and at at what voltage. also monitor core and VRM temps using HWinfo32 . set fan speed manually or use a custom profile in sapphire trixx to keep temps below 70c on core and below 90c on VRMs.

When overclocking test at 1150 Mhz with stock voltage. if thats not stable increase voltage in small increments of 0.025v. If your stock voltage is 1.225v step it up to 1.25v. Also the safe range for HD 7970 voltage is 1.3v . But i would say restrict yourself to 1.275. test for stability. Always try to achieve a balance of core clocks, voltage, temps, fan speed and noise. Normally the range where you achieve that is around 1.175 Ghz - 1.2 Ghz.
Edited by raghu78 - 10/23/12 at 1:11am
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post #13 of 14
Quote:
Originally Posted by th3illusiveman View Post

After spending some time with this card i managed to get the following
1180Mhz core with 1149Mv (+20% PL)
As for memory i just put it at 6200Mhz because i don't know how fast this stuff can go on average and my GTX570s can only manage 4000mhz QRD
Good news is it goes like hell. Its a very very fast card and it plays battlefield 3 much much smoother than my 570's can. There is almost no stuttering and i managed to get High-Extreme settings to run in the 100-120 Fps range and it was awesome.
Bad news is it is Loud as hell too. The card reaches around 70c with a 60% fan speed and that's when things start getting irritating, I don't know if its louder than my 570's (One was reference the other TFIII) because i use a new case but it is very audible and definitely comparable to SLi noise.

if its a reference HD 7970 card you have the best would option be to reduce the clocks to 1100 Mhz and try and reduce voltage. that would reduce heat significantly. You can also reduce fan speed to 50% to lower noise. Also with the 12.11 beta driver your HD 7970 card will spank the GTX 570 by more than 50%. Why do you want to spoil your PC acoustics and put with extra heat and noise for a meagre 5 % performance.

At 1080p a HD 7970 Ghz running at 1050 Mhz kicks serious ass maxing out with Ultra 4X MSAA at 65+ fps.
http://hexus.net/tech/reviews/graphics/46905-amd-catalyst-1211-benchmarked-surprising-performance-gains/?page=3
http://www.computerbase.de/artikel/grafikkarten/2012/bericht-amd-catalyst-12.11-beta/9/

At Ultra without MSAA settings HD 7970 would be hitting 100 - 120 fps.
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post #14 of 14
Quote:
Originally Posted by raghu78 View Post

Before overclocking check the card for complete stability at stock speeds. First test the apps like BF3, Crysis 2, Heaven 3.0, 3D Mark 11 at stock speeds. once you have confirmed its stable you can overclock. yeah artifacts mean the overclock is unstable. what clock speeds were you running and at at what voltage. also monitor core and VRM temps using HWinfo32 . set fan speed manually or use a custom profile in sapphire trixx to keep temps below 70c on core and below 90c on VRMs.
When overclocking test at 1150 Mhz with stock voltage. if thats not stable increase voltage in small increments of 0.025v. If your stock voltage is 1.225v step it up to 1.25v. Also the safe range for HD 7970 voltage is 1.3v . But i would say restrict yourself to 1.275. test for stability. Always try to achieve a balance of core clocks, voltage, temps, fan speed and noise. Normally the range where you achieve that is around 1.175 Ghz - 1.2 Ghz.

Cheers!

There was all the information what i was lacking of. There was everything what i just needed, good temps, voltages and what to except for the card. Now it's much more easier to start overclocking the card when you know something about it. Also that HWinfo32 was new software for me, I'm going to use that.

Yeah, luckily my girlfriend is on business trip until Thursday, so i can take my time with the card without any distraction smile.gif

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