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Can't get a stable OC on my 7970?

Tags:
  • Core
  • Power Consumption
  • Graphics
Last response: in Graphics & Displays
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April 13, 2013 7:33:39 PM

So I have the XFX 7970 standard edition. (925MHz core clock, 1375 MHZ mem clock.) here's a link to my card.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I can't pass 1025 MHz core and 1425MHz mem. Yet I see other people getting 1100MHz and 1500MHz core and mem clocks. I haven't messed with the voltage at all, (other than using the CCC to slide power consumption to +20%)

So my question is this, is there a way to stabilize these higher speeds for my card? (different driver, unlock voltage, that sort of thing)

I'm using 13.3 beta driver, but same results with 13.1

More about : stable 7970

April 13, 2013 8:02:18 PM

That's a very low clock for memory. core is respectable though. Without upping voltages, you probably won't get too much higher than that core clock in most cases. Some cards don't overclock as well, and unfortunately you got one that doesn't oc so well. I can guarantee that everyone who is getting 1500mhz is overclocking though.
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April 13, 2013 8:17:21 PM

pyr0_m4n said:
So I have the XFX 7970 standard edition. (925MHz core clock, 1375 MHZ mem clock.) here's a link to my card.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I can't pass 1025 MHz core and 1425MHz mem. Yet I see other people getting 1100MHz and 1500MHz core and mem clocks. I haven't messed with the voltage at all, (other than using the CCC to slide power consumption to +20%)

So my question is this, is there a way to stabilize these higher speeds for my card? (different driver, unlock voltage, that sort of thing)

I'm using 13.3 beta driver, but same results with 13.1


Use the unlocked version of SAPPHIRE Trixx to overclock your card. If you give me your email I will send it to you. (I can't find the link easily).

You will have to up voltage if you want much better than that. Without increasing voltage I can get to 1070/1515. Yeah that is a little better than yours, but I have a SAPPHIRE OC edition, and SAPPHIRE always builds their cards for heavy overclocking.
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April 13, 2013 9:14:27 PM

CaptainTom said:
pyr0_m4n said:
So I have the XFX 7970 standard edition. (925MHz core clock, 1375 MHZ mem clock.) here's a link to my card.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I can't pass 1025 MHz core and 1425MHz mem. Yet I see other people getting 1100MHz and 1500MHz core and mem clocks. I haven't messed with the voltage at all, (other than using the CCC to slide power consumption to +20%)

So my question is this, is there a way to stabilize these higher speeds for my card? (different driver, unlock voltage, that sort of thing)

I'm using 13.3 beta driver, but same results with 13.1


Use the unlocked version of SAPPHIRE Trixx to overclock your card. If you give me your email I will send it to you. (I can't find the link easily).

You will have to up voltage if you want much better than that. Without increasing voltage I can get to 1070/1515. Yeah that is a little better than yours, but I have a SAPPHIRE OC edition, and SAPPHIRE always builds their cards for heavy overclocking.


I've got MSI afterburner which can unlock my voltage. If I chose that method, what would be a proper voltage for it? For the time being, assume temperature is not a problem.
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April 13, 2013 9:40:56 PM

1025/1425 isn't too bad. Not record setting but certainly not bad if it is stable.
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April 13, 2013 11:21:08 PM

pyr0_m4n said:
CaptainTom said:
pyr0_m4n said:
So I have the XFX 7970 standard edition. (925MHz core clock, 1375 MHZ mem clock.) here's a link to my card.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I can't pass 1025 MHz core and 1425MHz mem. Yet I see other people getting 1100MHz and 1500MHz core and mem clocks. I haven't messed with the voltage at all, (other than using the CCC to slide power consumption to +20%)

So my question is this, is there a way to stabilize these higher speeds for my card? (different driver, unlock voltage, that sort of thing)

I'm using 13.3 beta driver, but same results with 13.1


Use the unlocked version of SAPPHIRE Trixx to overclock your card. If you give me your email I will send it to you. (I can't find the link easily).

You will have to up voltage if you want much better than that. Without increasing voltage I can get to 1070/1515. Yeah that is a little better than yours, but I have a SAPPHIRE OC edition, and SAPPHIRE always builds their cards for heavy overclocking.


I've got MSI afterburner which can unlock my voltage. If I chose that method, what would be a proper voltage for it? For the time being, assume temperature is not a problem.


I have used MSI afterburner many times, and I do think it is a good software. I just recommended TRIXX because it tends run leaner, offer more headroom (No limits), and is a little more stable in my experience.

Otherwise it is best to just start at default clocks and up core until it is unstable. Then up voltage a hair. Rinse and repeat with both core and mem. It's that simple, and personally I find Unigine Heaven 4.0 and Metro: 2033 to be good benchmark tools.

If you want my guess for what your card can do: Core/Mem at 1145/1650 with core/mem voltages at 1205/1700. But you should really do it yourself.

EDIT: WATCH YOUR TEMPERATURE!!! Use GPU-Z to monitor both the core and memory temps. If either is getting above 90 for long periods, stop it!
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