Continuing to overclock 7950.

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N4g4rok

N4g4rok

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So far i've got it up to 1000 Mhz GPU clock, 1400 Mhz Memory clock, and according to GPU-Z, the VDDC is idling at 1.020 V, which was done by upping the power controll settings in CCC by 10%.

How do i go about continuing to increase its performance? A couple games seemed to get a little choppy for a second as it is now. What's the proper ratio to keep for GPU clock/Memory clock/Voltage?
 
blastingcap

blastingcap

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Sep 16, 2010
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Trial and error. I have found for my 7970 that the millivoltage should be roughly equal to the core clock. So 1.049 volts for 1049 core, 1.075 volts for 1075MHz core, etc. I haven't bothered tracking memory as closely.
 
N4g4rok

N4g4rok

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blastingcap said:
I haven't bothered tracking memory as closely.
Click to expand...

What does the memory usually sit at? Doesn't it have to keep up with the core speed to an extent?

By that i mean increases in the GPU clock require increases in the memory clock for stability.
 
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blastingcap

blastingcap

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79xx is not as memory bandwidth constrained as 6xx so I think core takes precedence. Just clock up core, then clock up memory until you reach the point of zero gain. If you go past that, you either get nothing or even lose speed because of the error-correcting memory.
 
Stuka87

Stuka87

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Overclocking memory really does nothing until you get the GPU itself way up there. The 79xx cards have tons of it.

To go higher, you need to use MSI Afterburner (or similar) to boost the voltage up. CCC does not allow you to do this. It leaves voltage right where it was from the factory. So get AfterBurner, and as I first step I would try 1100, and boost your load voltage by 0.050 volts. Then just work your way up from there. Be sure to keep an eye on temps.
 
Don Karnage

Don Karnage

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aaksheytalwar said:
stop misleading people. he cant do that with a 7950 and stock cooling
Click to expand...

I'm not asking him to game at 1200 core. I'm asking for an 11 run at 1200 core with 100% fan. Just because you're too much of a puss to push your card doesn't mean he is.
 
spinejam

spinejam

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blastingcap said:
Trial and error. I have found for my 7970 that the millivoltage should be roughly equal to the core clock. So 1.049 volts for 1049 core, 1.075 volts for 1075MHz core, etc. I haven't bothered tracking memory as closely.
Click to expand...

I agree -- several 7970's that I have played with behaved in a similar fashion. :thumbsup:
 
N4g4rok

N4g4rok

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As far as voltage goes, what's safe range to stay at for constant gaming and workstation use?
 
N4g4rok

N4g4rok

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Gave Crysis 2 a try just using options tweaked in CCC. it was running really well, but wouldn't make it far.

setting were as follows:
GPU Clock: 1000MHz
Memory Clock: 1425MHz
"Power control" settings: 5%

crashes came every few minutes, so i googled for an article that might have been about my card specifically, and i guess HARDOCP had done one a while back. With out adjusting voltages, the had the core clock up to 1070, and the memory up as high as CCC would let them, same with power settings.

Gave it a try, and just while writing this post, the driver failed on me. I'm going to browse around for more stability tips, but i'm curious as to how much i can do to this thing before i start causing damages.
 
N4g4rok

N4g4rok

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SickBeast said:
OP you should be able to hit 1200mhz. What kind of cooling do you have?
Click to expand...

Stock cooler. it's XFX's "Ghost Thermal" cooling if that means anything to you. Temps seemed ok when i was testing it. it was 74-76C and i was under the impression that anything under 80C is good news.
 
Stuka87

Stuka87

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N4g4rok said:
Stock cooler. it's XFX's "Ghost Thermal" cooling if that means anything to you. Temps seemed ok when i was testing it. it was 74-76C and i was under the impression that anything under 80C is good news.
Click to expand...

Is this their dual fan cooler? Those temps are high for your settings with a dual fan cooler.

As it is, you have no room to boost the voltage up for a higher speed with those temps.
 
N4g4rok

N4g4rok

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Termie said:
They got it up to 1150/1575 with voltage. Pretty amazing results.
Click to expand...

I'm perfectly happy with he results they had without tweaking the voltage. That's more what i'm looking for, just to edge out a little bit more in the part nor 24/7 use without reducing its longevity by a huge amount.
 
Termie

Termie

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N4g4rok said:
I'm perfectly happy with he results they had without tweaking the voltage. That's more what i'm looking for, just to edge out a little bit more in the part nor 24/7 use without reducing its longevity by a huge amount.
Click to expand...

From the looks of it then, you're already near the max overclock, as they were able to hit 1020/1575. Not much more room for you on the core at default vcore, but you may be able to increase memory if you wish - benchmark it to see if you're actually getting any improvement, though
 
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