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Want to pull the trigger on a socket 1155, but have been warned it cou

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  • PCI
  • Socket
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January 12, 2013 2:06:21 PM

Hey, thanks for taking the time to read this.

I was about to purchase the components to make a new rig, based on the Intel socket 1155, Core i5-3570K.

However, my plan is crossfire two 7970’s and use a 1440p monitor. Someone cautioned me that he thinks two 7970s, driving that high a resolution, will bottleneck the PCI on socket 1155 and that I need to go for socket 2011 instead.

Question: Will socket 1155 running at PCI 3.0 x8/x8 crossfire, realistically limit performance compared to PCI 3.0 x16/x16?

I have no need of the other benefits of the 2011 socket, I do not need a hexacore CPU or quad channel ram and would frankly rather save the money. Equally, I would hate to shoot myself in the foot and hold back the performance of two 7970s by not using a socket that will let them stretch their legs.

I’m struggling to find any concrete opinions on the matter, and am at a complete loss how to proceed. Can any of you guys suggest anything, or have any experience with this kind of a set up?
Thanks again :) 

More about : pull trigger socket 1155 warned cou

a c 106 B Homebuilt system
January 12, 2013 2:17:28 PM

Nope, PCI-2 8x is enough for even the most powerful cards. PCI-3 8x is more than enough.
LGA2011 is only needed when your looking at including more than 2 cards, as most 1155 boards don't have the capability to have more than 2 slots with greater than 4x bandwidth.
January 12, 2013 2:20:39 PM

djangoringo said:
No bottleneck at all, just get the i5-3570k + z77 mobo, dual 8x 8x is good enough for those cards, no need to spend absurd quantities of money for lga 2011 which will not bring any gain to the table(for gaming).

http://hardocp.com/article/2010/08/23/gtx_480_sli_pcie_...
http://tpucdn.com/reviews/Intel/Ivy_Bridge_PCI-Express_...



Thanks for the quick reply, and doubly thanks for the sources. I was worried at first that perhaps as GTX 480s are fairly old now, that perhaps the increased power of the 7970 would still find a bottleneck, but the second link seems to suggest otherwise :) 
January 12, 2013 2:23:29 PM

manofchalk said:
Nope, PCI-2 8x is enough for even the most powerful cards. PCI-3 8x is more than enough.
LGA2011 is only needed when your looking at including more than 2 cards, as most 1155 boards don't have the capability to have more than 2 slots with greater than 4x bandwidth.


Yes, I knew I would need it for 3/4 way crossfire, but I dont intend to try anything quite that far. Hence, my reluctance to spend more for socket 2011. Thanks, I had assumed PCI-e 3.0 x8 would be enough, as if I understand correctly its directly equatable to PCI-e 2.0 x16?
a c 106 B Homebuilt system
January 12, 2013 2:26:23 PM

Yep, PCI-3 has double the bandwidth per lane compared to PCI-2. So Gen3 8x = Gen2 16x.
So in theory you are actually good for 3-way Crossfire/SLI on PCI-3 4x slots, though I personally wouldnt try it.
January 12, 2013 2:49:53 PM

Thank you both for your help, made me so much happier going forward with putting my build together!
!