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2x570 GTX SLI with/without 8800GT as PhysX card?

post #1 of 8
Thread Starter 
Hello guys, it's really good to be part of this community where the knowledge is the real thing.

My question is > I have Gigabyte P67A-UD7 mobo and I two zotac gtx 570 amp, what I have read from the manual, if I will run just the SLI , I will have always 16x pcie, but whenever I put something into other slots, it will decrease both 16x slots with card to x8. My idea is to use my old nv GT 8800 as dedicated physx card, is that worth to compare with degraded performance for SLI park?
Thanks a lot for your answers!
post #2 of 8
With 2 570's, a dedicated PhysX card is unnecessary. I don't think the 570's would completely saturate the board's bandwidth to a noticeable amount even at 8x/8x, but the 8800 wouldn't provide any noticeable benefit either.
 
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post #3 of 8
The 8800 will struggle to keep up with the 570s for physX, the 570s could likely bet the 8800's PhysX processing power and run the displays at the same time. Plus you'd lose 2-5% from the effective frame output rates from the 570s. Not worth it I'd say. Now if it were a gtx460, then it would be worth it if you play a LOT of physX games. Leve the job to the 570s.

TL;DR : No.
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post #4 of 8
You won't notice the difference between 16x and 8x pci-e, but you also won't really notice that third 8800GT in performance imho.
Except for the extra noise, power usage and heat.
post #5 of 8
Thread Starter 
Hi people,

thanks for your quick responses, I had same concerns as you told me, so it is confirmed. However, if I would like to have dedicated physX card, what should be a good deal? performance-price winner?
post #6 of 8
Get a GTX460 768mb for PhysX, it should last you for years to come.
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by TickleMeElmo View Post
Get a GTX460 768mb for PhysX, it should last you for years to come.
Thanks for advice, so do you think that it will give me advantage even if I slow down my PCIe slots to x8 for my SLI setup?
post #8 of 8
Thread Starter 
http://www.alza.cz/EN/zotac-geforce-...on-d221410.htm
I have found this card with 32% discount (full warranty and package). It is also zotac amp with extra clock and 1 GB of memory. What do you think?
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