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OCing the 7970

post #1 of 8
Thread Starter 
Found this online. It encouraged me to OC my 7970 above the 1100MHz core clock I've got it at right now. Issue is, anything higher than 1200MHz and it craps out upon starting a stress test/benchmark app. I upped the voltage from the stock 1.2v (which I find very high, who know's what Sapphire was thinking there) to 1.25v. Since it didn't work, I tried incrementing it to 1.3v the max voltage option available in Trixx.

Any suggestions? Do I have a crappy card? Should I return it and go with a 670 FTW?
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Skullpture
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post #2 of 8
Quote:
Originally Posted by Skullpture View Post

Found this online. It encouraged me to OC my 7970 above the 1100MHz core clock I've got it at right now. Issue is, anything higher than 1200MHz and it craps out upon starting a stress test/benchmark app. I upped the voltage from the stock 1.2v (which I find very high, who know's what Sapphire was thinking there) to 1.25v. Since it didn't work, I tried incrementing it to 1.3v the max voltage option available in Trixx.

Any suggestions? Do I have a crappy card? Should I return it and go with a 670 FTW?

It's a silicon lottery. What temperatures are you getting when it craps out?
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post #3 of 8
First.. Overclocks are never guaranteed. You buy a card at the rated speed. If it works fine at that speed it is not defective. Returning it because you cant force it to do what it is not rated to do is not right. Secondly.. why would you take a 7970 at 1100 and return it for a gtx670 at 1006?
post #4 of 8
Thread Starter 
Quote:
Originally Posted by rageofthepeon View Post

It's a silicon lottery. What temperatures are you getting when it craps out?
Temps don't really get any hotter than 65*C.
Quote:
Originally Posted by Zarich View Post

First.. Overclocks are never guaranteed. You buy a card at the rated speed. If it works fine at that speed it is not defective. Returning it because you cant force it to do what it is not rated to do is not right. Secondly.. why would you take a 7970 at 1100 and return it for a gtx670 at 1006?
You're absolutely right. I won't return it because it doesn't OC well. Just weighing my options on whether or not I can get more out of a 670 for a cheaper price than the 7970. I bought the 7970 with hopes that I could keep it for a while. I had memory shortages with the 560 Ti so I upgraded. GTA IV is a **** game in terms of the engine so the 3x more VRAM didn't do much there.

The 3GB VRAM was very compelling and all the benchmarks showing it matching and surpassing the 680 made my trigger finger itchy in the checkout. After buying it and installing it, it ran well but then I started noticing the 670 being only 5% slower than the 680 at 2/3 the price ($340 vs $500). A performance margin that easily be negated with light OCing. That plus the videos I've seen of 670s running at 1200MHz easily makes me REALLY look at my decision.

It also seems that my 7970's voltage is locked at 1.775V. Doesn't change ingame at all even if I change the VDDC option in Trixx.
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Skullpture
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post #5 of 8
Quote:
Originally Posted by Skullpture View Post

Temps don't really get any hotter than 65*C.
You're absolutely right. I won't return it because it doesn't OC well. Just weighing my options on whether or not I can get more out of a 670 for a cheaper price than the 7970. I bought the 7970 with hopes that I could keep it for a while. I had memory shortages with the 560 Ti so I upgraded. GTA IV is a **** game in terms of the engine so the 3x more VRAM didn't do much there.

The 3GB VRAM was very compelling and all the benchmarks showing it matching and surpassing the 680 made my trigger finger itchy in the checkout. After buying it and installing it, it ran well but then I started noticing the 670 being only 5% slower than the 680 at 2/3 the price ($340 vs $500). A performance margin that easily be negated with light OCing. That plus the videos I've seen of 670s running at 1200MHz easily makes me REALLY look at my decision.

It also seems that my 7970's voltage is locked at 1.775V. Doesn't change ingame at all even if I change the VDDC option in Trixx.

Well, you could always return the 7970 and buy a 2x 7870 xt / 7950 / 670 and get more power for close to the same price /shrug.
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post #6 of 8
Quote:
Originally Posted by rageofthepeon View Post

Well, you could always return the 7970 and buy a 2x 7870 xt / 7950 / 670 and get more power for close to the same price /shrug.


And then when you outgrow that setup, you are stuck. Doh! Nevermind that selling off a 7970 to get two lower end cards that are limited to two cards only is crazy.
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post #7 of 8
Quote:
Originally Posted by tsm106 View Post

And then when you outgrow that setup, you are stuck. Doh! Nevermind that selling off a 7970 to get two lower end cards that are limited to two cards only is crazy.

I never said it was the smart thing to do tongue.gif.

Seems like he wants more power and short of buying another 7970/79750 that's the only option I can think of staying with the same price range.
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post #8 of 8
Thread Starter 
I'll stick to the 7970. Works great. I just hope AMD starting dedicating more money to their driver-development team. biggrin.gif
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Skullpture
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