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Temperature concern and overclock guidelines with XFX 7970 DD

post #1 of 6
Thread Starter 
Hi,

I am new to this forum and also new(ish) to the concept of building my own PC. I am also a beginner at overcloking components. I would need guiding points on some things I am concerned about in terms of overclocking my GPU.

I have a single XFX 7970 Double Dissipation (not the black edition) in my rig. It is currently running at stock values i.e. : 925 Mhz core and 1375 Mhz memory clocks. My main concern is the temperature it reaches when under load. The main source of stress I am giving that card is Starcraft 2. I play it on the highest settings and I usually play custom games like Nexus Wars (for those who are familiar) in which there are a ton of units to render, lights and reflections and physics of take into account. I never though that a game "that old" would even come close to stressing my GPU but recently I started to track the GPU's temperature during such a game. The result is as shown :





So I am reaching 71 degrees celsius and I am concerned that when I start to play more demanding games, this card could be harmed. Also, I was really interested in overclocking this card for higher performance, but am concern that if I raise the clock speed, that temperature will follow. Now I know that in the Catalyst control center I can override parameters such as fan speed and power control setting (whatever that is) but I am afraid that if I chose a fixed value for fan speed, that it won't go higher if needed. Any thoughts ?

Thanks in advance for the feedback.
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post #2 of 6
Welcome to OCN smile.gif

GPUs can take more heat than CPUs and they generally operate at higher temps when under load, which is very normal.

For the 7970, anything below 85c under constant full load is ok. (I reach 90c with CF which is less ok but not a problem).

The temps you have in the chart are nothing to be worried about at all. But once you start oc'ing, the temps will go higher much more quickly, especially when you start adding volts.

It all depends on your airflow setup (case, # of fans, fan orientation ...etc).

Just set the fan profile to 80% and start playing around with the clocks & benchmark/stress your oc. Then play some heavy game(s) for an hour to make sure its stable.

You can use something like AB to give you a little more flexibility & info.


Here's how to put your rig in your sig:
http://www.overclock.net/t/1258253/how-to-put-your-rig-in-your-sig
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post #3 of 6
Thread Starter 
Thanks for the info. I'll play with fan speed and try to find a compromise between noise and temperature.

Also, for overclocking should i proceed as follows :

1- Raise clock speed a bit
2- Stress the card for a bit, while monitoring temperatures
3- If stable repeat 1
4- If not increase voltage a bit (and/or fan speed) and go back to 2

Should I look to increase core speed or memory speed or both ? Is there a preferred sequence ?
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post #4 of 6
Quote:
Originally Posted by Virgule View Post

Thanks for the info. I'll play with fan speed and try to find a compromise between noise and temperature.

Also, for overclocking should i proceed as follows :

1- Raise clock speed a bit
2- Stress the card for a bit, while monitoring temperatures
3- If stable repeat 1
4- If not increase voltage a bit (and/or fan speed) and go back to 2

Should I look to increase core speed or memory speed or both ? Is there a preferred sequence ?

Correct for the 4 steps.

As for memory oc'ing, it shouldn't be done until you've reached a core speed that you are satisfied with & stable. Then you start with the memory.
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post #5 of 6
Thread Starter 
Thank you so much !
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post #6 of 6
Quote:
Originally Posted by Virgule View Post

Thank you so much !

You're Welcome smile.gif
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TheSadFlute
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DyingHeart
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CPUMotherboardGraphicsRAM
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Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  BenQ XR3501 Logitech G710+ EVGA G2 750W 
CaseMouseAudioAudio
Cooler Master Stryker Logitech G602 Asus Strix Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
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