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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 854

post #8531 of 38704
Quote:
Originally Posted by DMT94 View Post

I need to know something, when doing crossfire (2 cards) i only need 1 bridge don't i ?

Yes mate, no need to use two.
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post #8532 of 38704
Dang cards are being divas tonight. Get home and start to do a little Heaven and Vantage and they won't pass nothing! These are finicky cards; sometimes they pass 1225MHz with no issue and others they can't even do 1200MHz... mad.gif
post #8533 of 38704
Quote:
Originally Posted by Majin SSJ Eric View Post

Dang cards are being divas tonight. Get home and start to do a little Heaven and Vantage and they won't pass nothing! These are finicky cards; sometimes they pass 1225MHz with no issue and others they can't even do 1200MHz... mad.gif

If you have a house fan you might take your side window off and just blow it on them. Sometimes a little ghetto-rigging is all you need. thumb.gif
    
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post #8534 of 38704
Quote:
Originally Posted by Smo View Post

Quote:
Originally Posted by DMT94 View Post

I need to know something, when doing crossfire (2 cards) i only need 1 bridge don't i ?

Yes mate, no need to use two.

Please allow me to disagree on this... As per Atiman's instructions, BOTH bridges should be used when in crossfire!
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post #8535 of 38704
Quote:
Originally Posted by alfredo82 View Post

Traded for a second 7970 and I'm very dissapointed in the crossfire performance and stability. Skyrim stutters and and locks up, goes to a white screen. Battlefield 3 freezes and I have to reset. Both cards run great and play the games on their own at stock clocks and Max ccc overclocks and they benchmark 3dmark and heaven just fine but let me down in the two games I primarily play. Got depressed and just went back to single gpu. Have i5 2500k @ 4.6 I play at 1080p (overkill, I know, but I plan on doing eyefinity eventually) here's a pic of the finished build. Wanted to join the club.



With crossfire you have 3 issues to deal with...
a) Overclockability... more difficult
b) Stuttering and at times inbalance between the usage of the 2 cards. I have the percentage usage of each card constantly shown on my keyboards lcd screen and at times it can become uneven between the 2 cards
c) Using the last couple of official drivers you get the 2d clock of the second card stuck in 3d

Issue a) is reasonable and there is nothing that can be done to solve it.

Issues b and c are already known to AMD and try to deal with it.
Edited by ElGreco - 4/6/12 at 7:32pm
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post #8536 of 38704
Quote:
Originally Posted by ElGreco View Post

Please allow me to disagree on this... As per Atiman's instructions, BOTH bridges should be used when in crossfire!

Allowed..

However, 2 bridges are not needed, you gain nothing.
In some cases dual bridges have had an adverse affect on performance.
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post #8537 of 38704
Quote:
Originally Posted by grunion View Post

Quote:
Originally Posted by ElGreco View Post

Please allow me to disagree on this... As per Atiman's instructions, BOTH bridges should be used when in crossfire!

Allowed..

However, 2 bridges are not needed, you gain nothing.
In some cases dual bridges have had an adverse affect on performance.

I used to use only one bridge, but Atiman strongly recommended to use both. I am afraid I do not remember the philosophy behind this,... I will have to ask him again.
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post #8538 of 38704
Quote:
Originally Posted by grunion View Post

Quote:
Originally Posted by ElGreco View Post

Please allow me to disagree on this... As per Atiman's instructions, BOTH bridges should be used when in crossfire!

Allowed..

However, 2 bridges are not needed, you gain nothing.
In some cases dual bridges have had an adverse affect on performance.

This, one bridge comes straight from AMD.
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post #8539 of 38704
Quote:
Originally Posted by tsm106 View Post

This, one bridge comes straight from AMD.

seconded in case anyone still wasnt sure biggrin.gif
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post #8540 of 38704
Dumb question but what is considered a high Asic number? I mean it seems like 100% would be the obvious answer but I've never seen anyone say that high so I'm just curious. Just found out mine is 81%. I kind of feel like my card is more of a low volts kind of cat so I'm curious if anyone knows.
    
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