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Experience with overclocking watercooled 7970

post #1 of 4
Thread Starter 
Hey guys,

So I have owned an MSI 7970 since release but decided to hold out on watercooling it for as performance and temps were in check.

Recently I decided to take the plunge as the rest of my system is watercooled + I like having minimal noise coming from my computer. I was one of the unfortunate ones in regards to overclocking headroom on my card as the highest stable core clock I could get was 1070mhz.

From what I have read, they are fairly heat sensitive and adding a waterblock can give you a fair bit higher overclock.

So I purchased this -

448

Booted up and found my card was idling at an beautiful 23c!!

I went straight to afterburner and slapped 1100mhz core and 1500mhz mem with stock volts (1.187v) and ran 3dmark 11. At these clocks it would artifact all over the place previously however now - PERFECT!

Things were looking up so I moved the core to 1150mhz and ran again. Straight away I saw artifacts just like I used to get on air cooling.

I tried more voltage and lowered clocks but the most I could get out of the card without seeing artifacts was 1110mhz core and 1550mhz mem.

This was 15 loops of 3dmark 11 stable and temps on the card peaked at 30c.



Point if this thread is to find out if there are any little secrets to overclocking the 7xxx on water? Have I missed something?
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post #2 of 4
Depending on your asic and true start voltage, you need to raise the voltage.
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

Depending on your asic and true start voltage, you need to raise the voltage.

I cant remember my exact ASIC but it was EXTREMELY low! around 51%

My voltage in AB defaults to 1187mv which I believe to be correct. I have attempted all the way up to 1.25 but it doesnt have any affect on clocks.
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post #4 of 4
Asic % or leakage level doesn't have any real determination on clock frequency, it's still down to the overclock lottery. I've got one 58% card out of my current trio and it can run 1240/1700 at 1.28v with droop.

Heat isn't an issue for you, so unfortunately you might have come up short on the lottery pick...
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