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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 163

post #1621 of 38704
Quote:
Originally Posted by KidKB View Post

Thanks for this, unfortunately I have tried that as well.
Quick question though. If a pcie lane was "broken" could it potentially still supply power to the card but not be detectable in windows? I notice that CCC does not detect the third 7970 in lane 6, not sure why gpu-z does though. This is on a clean windows install as well...starting to suspect bad motherboard.

How did you connected cards with crossfire bridge connector?
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post #1622 of 38704
Using two crossfire bridges, first one connects to the first tab on the 7970's in the first pcie lanes. The second bridge connects to the second tab on the middle 7970 to the third in lane 6.
    
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post #1623 of 38704
Can someone tell me what the lowest possible CoreVoltage value is?
I need to get an idea how much I'll be able to undervolt a 7770 or whatever the weakest GCN card will be.
I'll need it for my HTPC.


Also, I still haven't been able to get a 7970 because of incredibly low availability in Norway.
Sold out everywhere and the prices are at 700$ frown.gif
 
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post #1624 of 38704
It should be 1st to 1st, 2nd to 2nd.
The third connector is only for 4way CF
post #1625 of 38704
Quote:
Originally Posted by omega17 View Post

It should be 1st to 1st, 2nd to 2nd.
The third connector is only for 4way CF
Quote:
Originally Posted by Ken1649 View Post


Yes sir, that is exactly how it is configured.

Something is wrong, with 3960X and RIVE, you should have 2x PCIe @x16/x16 or 4x PCIe @x16/x8/x8/x8.

Check your PCIe power cables from PSU to the card. Make sure the card is locked in the PCIe slots. Reset CMOS if you haven't for the BIOS to detect new device.

Thanks, this is actually on an ASRock Extreme9 mainboard. I can verify the card has power, the fan is up and running. I have also cycled through all three cards (i.e. take first gpu, put it in second pcie, take second, place it in third...etc. etc.) and all appear to be working properly.
    
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post #1626 of 38704

It doesn't matter, ASRock Extreme9 has 4 native PCIe @x8/x8/x8/x8. Go into BIOS to fiddle around and try to disable the controllers you don't need that share the lanes.

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post #1627 of 38704
I'm hitting 31c max and still can't get past 1160 stable. 1090 was the max on air. 57% asic ftw.
    
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post #1628 of 38704
Quote:
Originally Posted by PARTON View Post

I'm hitting 31c max and still can't get past 1160 stable. 1090 was the max on air. 57% asic ftw.

wow 57% asic? That's very rare one lol
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post #1629 of 38704
Is there any bandwidth tests with this cards yet?
Im running both at 8x 8x (P8Z68 V-Pro gen 3) but it would be a mehh if it was bottlenecking them for 10fps or even more!
post #1630 of 38704
Been doing a little testing with GPU-Tool today.

So far 1230/1650 @ 1.187v - been running GPU-Tool for 15 min straight and no artifacts to speak of yet. I really like how my temps are too 73c max and with my custom fan profile it never goes above 50% fan usage.

I did try 1250 but got an artifact, might work on the memory some more. Seeing the headroom topping out sporadically even on water makes me want to deter from water and maybe go with an aftermarket cooler at sometime.

Anyways more testing to be done!

Oh yeah - 71.8% ASIC by the way.
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