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[Official] AMD R9 290X / 290 Owners Club - Page 2273

post #22721 of 43911
Quote:
Originally Posted by Durvelle27 View Post

I have a question. Will i lose performance by crossfiring a R9 290 with R9 290X ?
Quote:
Originally Posted by BradleyW View Post

No, you won't really see a performance different between 290X CFX and 290 + 290X CFX. They practically perform the same since they are basically the same card. At most a 2-3c difference on a very GPU demanding game.
When you CF 290 with a 290x, the performance will be exactly like 290 CF. It is even worse in case you can't keep them cool, because 290x is hotter than 290.
So the better choice is to buy another 290 for 290 CF. Or if your cooling is good, sold the 290 and get a couple of 290X for the best CF performance
post #22722 of 43911
Quote:
Originally Posted by blue1512 View Post


When you CF 290 with a 290x, the performance will be exactly like 290 CF. It is even worse in case you can't keep them cool, because 290x is hotter than 290.
So the better choice is to buy another 290 for 290 CF. Or if your cooling is good, sold the 290 and get a couple of 290X for the best CF performance

How will it be like 290 CF?

He has a 290x and was thinking of adding a 290 alongside it.

Performance would be better than 290 CF but a little slower than 290x CF due to the 290x having more shaders.
 
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post #22723 of 43911
Quote:
Originally Posted by Sgt Bilko View Post

How will it be like 290 CF?

He has a 290x and was thinking of adding a 290 alongside it.

Performance would be better than 290 CF but a little slower than 290x CF due to the 290x having more shaders.
CF mirrors everything, from RAM to shader. So when you CF a 290 to 290x, only 2560 of 2816 shaders from 290x will be used. The performance therefore will be the same as 290 CF.
post #22724 of 43911
Quote:
Originally Posted by blue1512 View Post

CF mirrors everything, from RAM to shader. So when you CF a 290 to 290x, only 2560 of 2816 shaders from 290x will be used. The performance therefore will be the same as 290 CF.

Assuming the game is using more than 2560 shaders.
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post #22725 of 43911
Quote:
Originally Posted by blue1512 View Post

CF mirrors everything, from RAM to shader. So when you CF a 290 to 290x, only 2560 of 2816 shaders from 290x will be used. The performance therefore will be the same as 290 CF.

afaik you can still run 2 cards at their respectable core and mem speeds and nothing else would change.

So that means the shaders would still but unlocked as well i guess.
 
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post #22726 of 43911
The only issue with mismatch cards is that latency can slightly increase a little.
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post #22727 of 43911
Quote:
Originally Posted by blue1512 View Post


When you CF 290 with a 290x, the performance will be exactly like 290 CF. It is even worse in case you can't keep them cool, because 290x is hotter than 290.
So the better choice is to buy another 290 for 290 CF. Or if your cooling is good, sold the 290 and get a couple of 290X for the best CF performance
The 290 is to go along side with my 290X. Not willing to part with it just for 2x 290s tongue.gif
 
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post #22728 of 43911
Quote:
Originally Posted by BradleyW View Post

The only issue with mismatch cards is that latency can slightly increase a little.

interesting. could you possibly explain more?
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post #22729 of 43911
Quote:
Originally Posted by Sgt Bilko View Post

afaik you can still run 2 cards at their respectable core and mem speeds and nothing else would change.

So that means the shaders would still but unlocked as well i guess.

Yes, the 2816 shaders of 290x are still there but only 2560 of them used when you put it in CF with a 290. That's how CF have been working for ages.
The cards can be set to different core/mem speeds separately, but that will lead to some serious latency and stuttering. The best way is mirror everything though.
post #22730 of 43911
Quote:
Originally Posted by nightfox View Post

interesting. could you possibly explain more?

Well think about it. Two cards rendering at the same time. Both cards slightly different from one another in terms of IC's, tracers, resistors, architectural differences and IC timings + clock speeds. The faster card will always wait for the slower card. That "could" slighty increase frame time latency.
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