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Contemplating 3rd card for physx

post #1 of 10
Thread Starter 
as title says. i was looking to get a really cheap card for like £20 that can be used to drive my 3rd monitor, but was thinking i could use it for physx, would an 8400gs be any good for a physx card?! im thinking no... anything cheap that will be alright for physx? or should i just not worry about it. i may need to rephrase this...

edit: basically... want a cheap 3rd card to drive 3rd monitor, would a cheap one be good for physx?!
     
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post #2 of 10
Simply - no

Cheap - depends on what you consider cheap but:

GT240, GTS250, GT430, GTS450 all good Physx cards that are cheap (under £90)

Even a second hand GTX260/GTX275 would be a good idea for you!

EDIT: Bearing in mind you have 2 GTX580 - you can run three monitors from two cards now - you dont need a 3rd card for physx!
Edited by Mitche01 - 2/17/11 at 4:54am
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post #3 of 10
yeah wouldnt be good.

if u culd get any of the cards listed above (: even second hand
be all sweet
    
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post #4 of 10
Your 580s are more than enough. most <£20 PhysX cards make performance worse because they can't handle it (in Mafia 2 for example) and not many games utilize PhysX anyway.
    
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post #5 of 10
Thread Starter 
i run them in sli and you can only run 2 monitors in sli mode unless you're using surrond but all mine are diff sizes. thought the answer would be no really, but worth a check. it was more i'm getting a 3rd card would it be alright for physx rather than i want a cheap physx card. thanks guys
     
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post #6 of 10
Don't forget that the lower the card you pick for physx, it will hinder the performance of the SLI more.

Reason is that even tho physx doesn't use much of the GPU power, it still takes time, and the lower the card, the more the graphics card will have to wait for the physx to be done, and it will lower the FPS.

For a 580 SLI, I would say that a 450 is the minimum you will want for physx, tho I would risk being flamed and say that a GTX460 is what really need as a minimum for a strong SLI setup.

If you plan to use a cheap card, just don't, and leave physx on the one of the SLI cards as none-dedicated.
It will end up giving the same performance overall, as the 580s are extremely strong GPUs and can handle almost everything.
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post #7 of 10
Fermi is extremely well in computing.
Thus, older cards based on the GT200/G80/G92 (basically the same design) cores will more than likely held it back.

For the older series, you need at least a GTX260 to do the PhysX and that's the absolutely minimum for Fermi GTX SLI.

A GTX460 should have the sufficient specs to do the trick. The GTS450 is somewhat like the 260s in this regards.

However, the bottomline is, the dedicated card more than likely won't do the PhysX 90% of the time. Still, it feels good to have a PhysX Card
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post #8 of 10
Thread Starter 
ahh fair play, thanks guys. i think i will just get a low end just to power the monitor i cant really afford a 460 :/ i need to finish a build for m better half, so money will be going towards that instead.
     
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post #9 of 10
a 580 alone is powerful enough to alot of games with PhysX
Two is overkill
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post #10 of 10
Yeah, get a third cheap card just to drive the third monitor. You can easily continue doing PhysX on the GTX 580 SLI that you have.
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