GTX 970 + 1GDDR3 9800GT as PhysX

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Coltor

Coltor

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Sep 25, 2013
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Hi all, would running my spare 9800GT as a dedicated PhysX card be helpful?

I get great frame rates with the 970 but a couple games (namely Metro LL) take quite a hit when PhysX is enabled.

Would I see any improvement or would it even work at all?
 
Solution
photonboy
Above is correct.
It varies by how much PhysX calculations are being done, but I've seen several tests suggesting you'd want a card at bare minimum 50% as powerful as the main card.

In one of the games tested the much weaker card gained 11% to the frame rate and having two identical GTX580's gained 15% (SLI on the other hand with 2xGTX580 in that game got over 50% improvement).

The WEAKER the dedicated GPU the less it can help and more likely it is to make things worse, and unfortunately you'd have to test EVERY GAME with PhysX on the dedicated card and on only the main card to see if it helped or hurt.

When the dedicated GPU is too slow the main GPU and rest of system just sits tapping their virtual fingers waiting for it to finish...
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photonboy

photonboy

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Jun 20, 2006
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Above is correct.
It varies by how much PhysX calculations are being done, but I've seen several tests suggesting you'd want a card at bare minimum 50% as powerful as the main card.

In one of the games tested the much weaker card gained 11% to the frame rate and having two identical GTX580's gained 15% (SLI on the other hand with 2xGTX580 in that game got over 50% improvement).

The WEAKER the dedicated GPU the less it can help and more likely it is to make things worse, and unfortunately you'd have to test EVERY GAME with PhysX on the dedicated card and on only the main card to see if it helped or hurt.

When the dedicated GPU is too slow the main GPU and rest of system just sits tapping their virtual fingers waiting for it to finish which means lower frame rates.
 
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maxalge

maxalge

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May 31, 2012
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you would need a gtx 750 for it to be worthwhile as a physx card with a gtx 970
 
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