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The Difference? PCIE 2.0 & 3.0

post #1 of 19
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So i just bought the sabretooth 990fx an i do wonder what's the difference between the two versions?
I'm planning on buying the 7970 card's an i saw they use the 3.0 pcie versions will they work with the normal ones?
Will i suffer any performance loss or such.. thankfull for any answers or ideas!
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post #2 of 19
PCI-E 3.0 has twice the bandwidth of PCI-E 2.0 and probably supports higher power draws.

HD 7970 supports PCI-E 2.0 and even PCI-E 1.1. You'll not see a performance loss as no cards fully saturate PCI-E 2.0.

Think about it, if they didn't work with PCI-E 2.0, AMD would've lost most of the Intel users (even P67 Sandy Bridge boards don't have PCI-E 3.0) and all AMD users.
Edited by B!0HaZard - 3/14/12 at 5:54am
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post #3 of 19
I have heard that there is no noticeable performance gain with PCI-e 3.0. It is not worth going 3.0 if you have 2.0 and are just upgrading for that. Yes, the 7970s work wonderful in 2.0, as i have mine in one now.
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post #4 of 19
Thread Starter 
Quote:
Originally Posted by B!0HaZard View Post

PCI-E 3.0 has twice the bandwidth of PCI-E 2.0 and probably supports higher power draws.
HD 7970 supports PCI-E 2.0 and even PCI-E 1.1. You'll not see a performance loss as no cards fully saturate PCI-E 2.0.

Thank you i just read the artice on wikipedia.
Quote:
Initial reviews suggest that the new interface would not improve graphic performance compared to earlier PCIe 2.0, which, at the time of writing, is still under-utilized. However, the new interface would prove advantageous when used for computing purposes like OpenCL and C++ AMP.

I also found it funny however new 3.0 may be it's just 2-3 years away from 4.0 rolleyes.gif
Quote:
On November 29, 2011, PCI-SIG has announced to proceed to PCI Express 4.0 featuring 16 GT/s, still on copper technology. Additionally, active and idle power optimizations are to be investigated. Final specifications are expected to be released in 2014/2015.
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post #5 of 19
Yes it will work, Pci-x 3.0 is backwards compatible with 2.0 and 1.0 slots.
No you will not notice any effects of running in any generation slot from the first to the third.
There is no card on the market that can saturate the bandwidth, tests have proven that even in SLI/CFX that there is no noticeable difference while running in reduced bandwidth, eg; 2.0 x16 x16 vs 2.0 x8 x8 or even 2.0 x4 x4 , even when the bandwidth is reduced to PCI first gen x8 x8.

http://www.overclock.net/t/1188376/hardwarecanucks-hd-7970-pci-e-3-0-vs-pci-e-2-0-comparison

http://hardocp.com/article/2010/08/23/gtx_480_sli_pcie_bandwidth_perf_x16x16_vs_x8x8/

http://hardocp.com/article/2010/08/16/sli_cfx_pcie_bandwidth_perf_x16x16_vs_x16x8
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post #6 of 19
Quote:
Originally Posted by MiyukiChan View Post

Thank you i just read the artice on wikipedia.
Quote:
Initial reviews suggest that the new interface would not improve graphic performance compared to earlier PCIe 2.0, which, at the time of writing, is still under-utilized. However, the new interface would prove advantageous when used for computing purposes like OpenCL and C++ AMP.
I also found it funny however new 3.0 may be it's just 2-3 years away from 4.0 rolleyes.gif
Quote:
On November 29, 2011, PCI-SIG has announced to proceed to PCI Express 4.0 featuring 16 GT/s, still on copper technology. Additionally, active and idle power optimizations are to be investigated. Final specifications are expected to be released in 2014/2015.

Thing is, from the release of a new standard to the actual implementation/use, there's a 6-12 month delay. It takes months before motherboards and graphics cards are updated. Then it takes another ~2 years before the majority of the enthusiasts have the new PCI-E standard because they're waiting for something worth upgrading to (since PCI-E bandwidth has a negligible effect on performance).

You're looking at a full 2 GPU generations before some enthusiasts have switched. That's an awfully long time to wait if you aren't prepared with a new standard that supports those 2 generations.
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post #7 of 19
Quote:
Originally Posted by B!0HaZard View Post

PCI-E 3.0 has twice the bandwidth of PCI-E 2.0 and probably supports higher power draws.
HD 7970 supports PCI-E 2.0 and even PCI-E 1.1. You'll not see a performance loss as no cards fully saturate PCI-E 2.0.
Think about it, if they didn't work with PCI-E 2.0, AMD would've lost most of the Intel users (even P67 Sandy Bridge boards don't have PCI-E 3.0) and all AMD users.

Actually there is a performance loss, just not a huge one yet.

http://www.anandtech.com/show/5458/the-radeon-hd-7970-reprise-pcie-bandwidth-overclocking-and-msaa

"Ultimately what is clear is that 8GB/sec of bandwidth, either in the form of PCIe 2 x16 or PCIe 3 x8, will be necessary to completely feed the 7970. 16GB/sec (PCIe 3 x16) appears to be overkill for a single card at this time, and 4GB/sec or 2GB/sec will bottleneck the 7970 depending on the game. The good news is that even at 2GB/sec the bottlenecking is rather limited, and based on our selection of benchmarks it looks like a handful of games will be bottlenecked."
post #8 of 19
Thread Starter 
Quote:
Originally Posted by JieMan View Post

Yes it will work, Pci-x 3.0 is backwards compatible with 2.0 and 1.0 slots.
No you will not notice any effects of running in any generation slot from the first to the third.
There is no card on the market that can saturate the bandwidth, tests have proven that even in SLI/CFX that there is no noticeable difference while running in reduced bandwidth, eg; 2.0 x16 x16 vs 2.0 x8 x8 or even 2.0 x4 x4 , even when the bandwidth is reduced to PCI first gen x8 x8.
http://www.overclock.net/t/1188376/hardwarecanucks-hd-7970-pci-e-3-0-vs-pci-e-2-0-comparison
http://hardocp.com/article/2010/08/23/gtx_480_sli_pcie_bandwidth_perf_x16x16_vs_x8x8/
http://hardocp.com/article/2010/08/16/sli_cfx_pcie_bandwidth_perf_x16x16_vs_x16x8
Quote:
Originally Posted by B!0HaZard View Post

Thing is, from the release of a new standard to the actual implementation/use, there's a 6-12 month delay. It takes months before motherboards and graphics cards are updated. Then it takes another ~2 years before the majority of the enthusiasts have the new PCI-E standard because they're waiting for something worth upgrading to (since PCI-E bandwidth has a negligible effect on performance).
You're looking at a full 2 GPU generations before some enthusiasts have switched. That's an awfully long time to wait if you aren't prepared with a new standard that supports those 2 generations.

I guess i won't have to worry then.. ^^;
Question will it be possible to crossfire 6850 with 4670 or 6850 with 7970?
Edited by MiyukiChan - 3/14/12 at 6:10am
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post #9 of 19
Quote:
Originally Posted by OwnedINC View Post

Actually there is a performance loss, just not a huge one yet.
http://www.anandtech.com/show/5458/the-radeon-hd-7970-reprise-pcie-bandwidth-overclocking-and-msaa
"Ultimately what is clear is that 8GB/sec of bandwidth, either in the form of PCIe 2 x16 or PCIe 3 x8, will be necessary to completely feed the 7970. 16GB/sec (PCIe 3 x16) appears to be overkill for a single card at this time, and 4GB/sec or 2GB/sec will bottleneck the 7970 depending on the game. The good news is that even at 2GB/sec the bottlenecking is rather limited, and based on our selection of benchmarks it looks like a handful of games will be bottlenecked."

Did you even look at that?

PCI-E 3.0 x8 is the same as PCI-E 2.0 x16, so he's looking at a 2 FPS drop at worst and a 0.0 drop at best. That's within margin of error, mate.

Quote:
Originally Posted by MiyukiChan View Post

I guess i won't have to worry then.. ^^;
Question will it be possible to crossfire 6850 with 4670 or 6850 with 7979?

No, only within the same generation.
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post #10 of 19
You can't crossfire those cards, but you can run them both for the purpose of compute tasks if you so choose.
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