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Does having 2 cards in Crossfire/SLI really pay off? - Page 3

post #21 of 27
It does pay off but you want to ensure that you can stay above 60FPS. It will lessen the prevalence of microstutter.

You really want to consider something like two 5850's minimum - of course some of your result depends on what resolution your monitor is, what your prestige for graphics are and what CPU you have. A weak CPU can also keep your frame rate low.

It does pay off and can net you 75-95% performance over one card, but you also want to keep your frame rate over 60FPS otherwise microstutter will most likely wreck your experience.
post #22 of 27
Quote:
Originally Posted by iLeeT View Post

Wow... Thats an awesome/impressive test you just ran. That proves alot! Thanks... thumb.gif
So I guess from what everyone is saying running 2 HD3850's in SLI is a bad idea? mad.gif Bummer... They are obtainable for about 20-40$ a piece. redface.gif

i had 2 3870s crossfired and bf3 was unplayable
they are just too old. not enough memory
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post #23 of 27
Thread Starter 
Im noticing that alot of motherboards have 2 PCI x16 slots but one is advertised to run in 4x mode. Does this mean that the other runs at 12x when paired up?

Does this affect dual cards in SLI/Xfire in any way?

Is it better to have both slots running in 8x mode as I saw one motherboard offer?

What would be the difference, how would this work and is one better than the other?

16? 12 4? 8 8? W*F?
     
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post #24 of 27
Quote:
Originally Posted by iLeeT View Post

Im noticing that alot of motherboards have 2 PCI x16 slots but one is advertised to run in 4x mode. Does this mean that the other runs at 12x when paired up?
Does this affect dual cards in SLI/Xfire in any way?
Is it better to have both slots running in 8x mode as I saw one motherboard offer?
What would be the difference, how would this work and is one better than the other?
16? 12 4? 8 8? W*F?

Nope it'll go to the lowest x# for the port. For example: if only one is x16 and the other x8, it'll run both in x8.

2 PCI-e slots running in x16 will run in x16 in Crossfire/SLI.
post #25 of 27
Thread Starter 
hmm. So how fast will http://www.asus.com/Motherboards/AMD_AM3Plus/M5A97/#specifications this boards x16 slots run at in dual?

x4 mode, black ??? What does that mean?
Edited by iLeeT - 5/13/12 at 6:30pm
     
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post #26 of 27
Quote:
Originally Posted by iLeeT View Post

hmm. So how fast will http://www.asus.com/Motherboards/AMD_AM3Plus/M5A97/#specifications this boards x16 slots run at in dual?
x4 mode, black ??? What does that mean?

it means that it will run at x4 not x16 bandwidth
it says x16 because it is physically x16 length and you can put in any standard card in it, there are also those which are physically x1 physically for example, so that means you wouldn't be able to put in a card without some kind of adapter...

it will work fine in x4 though
even if you use a stronger graphic card
here is an example with gtx 480

http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Express_Scaling/
http://www.hardocp.com/article/2010/08/25/gtx_480_sli_pcie_bandwidth_perf_x16x16_vs_x4x4

as you can see it makes almost no difference
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post #27 of 27
no 2 cards does not do anything other than enlarge your Epeen.
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