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Running two 290s in crossfire at dual x8 pci-e 2.0

post #1 of 13
Thread Starter 
Am i going to lose much performance at all running crossfire 290s on dual x8 rather than dual x16? I've got a p8z68-v pro gen 3 with a 2700k so I'm wondering if i should upgrade to make use of pci-e 3.0.
post #2 of 13
Shouldn't really tell a difference between x8 and x16.... but let me know how the performance works out for you because i have two r9 290's as well and the performance boost I get from adding the 2nd card is literally -10% (negative 10%) to %50. Something is seriously wrong with the crossfire here.
 
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post #3 of 13
Driver is only beta and is most likely the problem.

I did not look at your computer specs for PCIe speeds.

To OP, PCIe 8x did not used to be a problem, however, these GPUs push so much communication through PCIe that they may take a larger hit than older video cards.

I am familiar with older dual video card solutions, but this is too new for me. One PCIe v2.0 16x and one 8x used to drop performance around 8% on average. Two PCIe v2.0 8x, I am not sure, but the faster the card the greater the loss, but it has to be a FAST card to lose more.

The R9 290 or R9 290X should be hampered more than 8% on PCIe 8x especially if it is PCIe version 1.

Edit:

I missed you saying you have PCIe v2.0, sorry. As mentioned though, these cards push a LOT of data and I expect they are the first generation that can saturate PCIe 2.0. That said, you will lose. Not sure how much, last generation fast cards used to lose, on average, 8% with one 16x and one 8x. Slightly more with two 8x, but not much more. The R9 290 and 290X push a great deal of data through PCIe, and I am not sure how much you will lose at this time. You might try a google search, unless someone posts here with hard numbers.

As far as how much data throughput will be slowed, it also depends upon the entire motherboard/CPU as well as PCIe v2.0. It looks as though your computer is borderline for PCIe data throughput. Keep what you have and let us know what percent difference you have with 1 card and 2. That information will help everyone with the same question you have.
Edited by Dan848 - 11/9/13 at 10:22am
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post #5 of 13
Thread Starter 
i'll see how i go with dual x8. If the performance hit is significant would it be better to upgrade to ivy-bridge for pci-e 3.0 or just try find a mobo with dual x16 support?
post #6 of 13
with a 2700k i would suggest just finding a motherboard if you can, it's not really worth to upgrade from a 2700k to any ivybridge. Unless you have the money, go for it.
 
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post #7 of 13
Quote:
Originally Posted by iPDrop View Post

with a 2700k i would suggest just finding a motherboard if you can, it's not really worth to upgrade from a 2700k to any ivybridge. Unless you have the money, go for it.


That's terrible advice. Why would he bother to get a new board with the cpu he has? It will be folly because the pcei bus/controller is on die in the cpu! With a new board and same cpu he's right back where he started.

That and the fact that his board already supports pcie 3 so all he needs is an ivy cpu to make the magic happen.

Quote:
If the performance hit is significant would it be better to upgrade to ivy-bridge

OP, just try it out. And for the record you won't know if you could be leaving more performance on the table because you have nothing to compare it to technically. Anyways, as shown the difference is small at gen2 x8, so I doubt you'd notice a difference regardless.
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post #8 of 13
Upgrading to ivy bridge from a 2700k just for gen3 is a waste of money
 
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

OP, just try it out. And for the record you won't know if you could be leaving more performance on the table because you have nothing to compare it to technically. Anyways, as shown the difference is small at gen2 x8, so I doubt you'd notice a difference regardless.

yeah ill give it a go. just gotta wait patiently for these non-reference 290s to come out.

and with those gen2 benches you put out, was that x16/x8?
post #10 of 13
OP, did you ever try this out? I'm looking to move to two 290x on a sandy bridge platform bound to pci-e 2.0 8x as well. What was your experience?
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