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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 195

post #1941 of 38704

 

Quote:
Originally Posted by Levesque View Post

After playing alot with Quad-Fire 4X 7970, here's my observations.

I'm stuck at 1250/1600 for now. No matter the voltage. Strange...

I get the same speed at 1.225v that I get at 1.25v and 1.3v. It doesn't crash, but I get artifacts at those voltages, but can't get higher. So my cards are now at 1.225v. 1.25v and 1.3v are now possible and stable, but I can't get faster cores speed with those higher voltages. Interesting...

My low 1.05v VID card is limiting me. The 3 others with a VID of 1.1125v can do 1335/1700. Really interesting

1 weak link that is slowing the Quad set-up... But it's not like 1250/1600 is bad with 4 cards at 1.225v. Nice and cool with that low voltage. biggrin.gif

On air, I was stuck at 1175/1600. And 1.3v was impossible and crashing

So water gave me higher core speed, and the posssibility to go at 1.25v and 1.3v without any problems. On air, 1.25v or 1.3v was crashing. Probably the low VID card...

But 1.225v gives me the same speed. 1.25v and 1.3v are not doing anything for my low VID card. It's like the low VID card is limited to that voltage. Hum.

For those interested, on water, my cores are at 26 celsius idle and never goes over 35-38 on high loads. Nice and cool.

Huummm. Something is strange here, and not working right. Is there a hard coded limit in the BIOS limiting the voltage on those low VID cards? Probably. It's not logical that I can't push the cards faster with 1.25v and 1.3v compared to 1.225v...

I know Asus are working on a new BIOS to be able to use higher voltage and bette OC, like 1.35v. So I will wait for better utilities, BIOS and drivers. And will play at 1250/1600 for now.

 


3930K @5 GHz and 4x 7970s overclocked? I still think need to check the PSU +12V ripple on a single PSU thinking.gif. A single PSU stands no chance with sudden peak load spike at that kind of power draw confusedsmiley.png

 

The RIVE has measuring points for that, can plug the DMM and check the readings at full load.
 

 

 


Edited by Ken1649 - 1/25/12 at 8:13am
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ケンジ
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post #1942 of 38704
Nvm. Not stable. Will test further
Edited by Norlig - 1/25/12 at 7:52am
post #1943 of 38704
Quote:
Originally Posted by Norlig View Post

Update for the sheet:
I got two Sapphire 3GB cards.
Overclocked to 1200 core, 1600 mem. 1,27v, stock cooler
Asic Quality is 83,6% on first Card and 81,0% on second Card.
GPU-Z validation

Good grief. Looks like Sapphire's tend to be very solid in the O/c department. Most users here have been able to push the hell out of them. 1200 on air is fantastic!
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post #1944 of 38704
Here's my single ASUS 7970 3DMark11 result cooled by the standard stock cooler at 1270/1700 1.260v, temps reached a max of 60C


450
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post #1945 of 38704
Quote:
Originally Posted by evensen007 View Post

Good grief. Looks like Sapphire's tend to be very solid in the O/c department. Most users here have been able to push the hell out of them. 1200 on air is fantastic!

I have 2 Sapphire and just finished my first overclock attempts round. The card with the 79.5 asic is limiting me at stock voltage at 1150/1600 on air, while my second one with asic 73,6 runs perfectly fine at 1200/1600 at stock voltage.

I mention this because perhaps some of you feel bad, being "unlucky" to get a low asic card...
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post #1946 of 38704
i got 1200/1600 atm at 1200mv as highest oc, its stable in occt, gputool and heaven dx11. haven't tried bf3 yet.
Quote:
Originally Posted by topdog View Post

Here's my single ASUS 7970 3DMark11 result cooled by the standard stock cooler at 1270/1700 1.260v, temps reached a max of 60C
450

at what speed was ur fan running?
post #1947 of 38704
It would be nice to add if you are running Power tune +20% otherwise the GPU is being throttled.

Monitor with GPUZ and you will see the clocks going down if Power Tune is not at 20% as far as I know with Furmark and OCCT like Lothar said.
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post #1948 of 38704
When OCing with MSI AB, is it only UnofficialoverclockingMode you have to change?

Thx
post #1949 of 38704
Quote:
Originally Posted by Aventadoor View Post

When OCing with MSI AB, is it only UnofficialoverclockingMode you have to change?
Thx

That, and also the EULA statement that you have to copy and paste in as well

"I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it" (without the quotations)
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post #1950 of 38704
Quote:
Originally Posted by Darklol View Post

It would be nice to add if you are running Power tune +20% otherwise the GPU is being throttled.
Monitor with GPUZ and you will see the clocks going down if Power Tune is not at 20% as far as I know with Furmark and OCCT like Lothar said.

i have overdrive and powertune disabled. while under load my clocks dont go down.
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