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PLX Chip Needed For OCed 7970 X-Fire?

post #1 of 6
Thread Starter 
I just got a 7970. I will be overclocking it to the highest I possibly can, and using it on a 1440p monitor. Therefor I'll be maxing out this card, and having give all it can give. So I'm thinking I'll need a lot of bandwidth.

I plan to get another soon, maybe very soon. Then.....probably another for Tri X-Fire in the future.

I can get a 1150 board without PLX (x?/x?/NC or x16/x4/x4 or x8/x8/x4) (Plus I'll be needing a sound card)

Or i could get the Gigabyte G1.Sniper 5 (x16/NC/x16/NC or x16/NC/x8/x8 or x8/x8/x16/NC or x8/x8/x8/x8) (Comes out to $100 more than other options because It's got very good integrated sound)
Edited by TehOnlyMITTENS - 6/3/13 at 7:04am
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Triennial
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post #2 of 6
PCIe 3.0 x8 is the equivalent of a PCIe 2.0 x16. There will be no bottleneck.

What motherboard are you using?
Edited by aznpersuazn - 6/3/13 at 7:03am
post #3 of 6
Thread Starter 
Quote:
Originally Posted by aznpersuazn View Post

PCIe 3.0 x8 is the equivalent of a PCIe 2.0 x16. There will be no bottleneck.

You got me before I made the question more clear tongue.gif

Now the question is more like "Will PCI-E 3.0 @ x4 Bottleneck A 7970"
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post #4 of 6
Quote:
Originally Posted by TehOnlyMITTENS View Post

You got me before I made the question more clear tongue.gif

Now the question is more like "Will PCI-E 3.0 @ x4 Bottleneck A 7970"

Your bandwidth will be halved since PCIe 3.0 x4 is the equivalent to PCIe 2.0 x8.

Look at this testing for performance. Even though bandwidth decreased, real world applications changed very little in response to the decrease in bandwidth availability.

http://www.behardware.com/articles/850-4/pci-express-3-0-impact-on-performance.html
post #5 of 6
Thread Starter 
Quote:
Originally Posted by aznpersuazn View Post

Your bandwidth will be halved since PCIe 3.0 x4 is the equivalent to PCIe 2.0 x8.

Theoretically yes, but that is if an overclocked 7970 uses ALL available bandwidth of a PCI-E 2.0 X16.
If that is true, and it results in anything near a 50% performance decrease, there is no way I'll be going that route.
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Triennial
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post #6 of 6
Quote:
Originally Posted by TehOnlyMITTENS View Post

Theoretically yes, but that is if an overclocked 7970 uses ALL available bandwidth of a PCI-E 2.0 X16.
If that is true, and it results in anything near a 50% performance decrease, there is no way I'll be going that route.

Look back at my edited post:
Warning: Spoiler! (Click to show)
Quote:
Originally Posted by aznpersuazn View Post

Your bandwidth will be halved since PCIe 3.0 x4 is the equivalent to PCIe 2.0 x8.

Look at this testing for performance. Even though bandwidth decreased, real world applications changed very little in response to the decrease in bandwidth availability.

http://www.behardware.com/articles/850-4/pci-express-3-0-impact-on-performance.html
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