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pci express and sandy bridge confusion

post #1 of 9
Thread Starter 
I'm reading about some upcoming sandy bridge motherboards from all the big vendors (asus, gigabyte, etc..) but it looks like 3 and 4-way sli is out. I just read about a high-end asus p67 board and the first lane is x16 but only supports x8 x8 for multi-gpu setups. There is a third pci express lane but it's only a x4. Anyone have any info about this?
    
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post #2 of 9
repost

Most of the high-end mobos have an NF200 chip that allows for SLI. It essentially "adds" lanes, but eventually they have to squeeze back into the original 20 before arriving at the CPU. The NF200 also adds some latency.

On the plus side, PCI lanes on LGA 1155 boards have twice the bandwidth, so I think we still have a lot to look forward to!
Edited by cmeeks - 12/22/10 at 7:42pm
    
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post #3 of 9
Yes, unfortunately 3- and 4-way SLI is out since Sandy Bridge LGA 1155 has the same amount of PCIe lanes like LGA 1156.

So therefore it's either:
- x16
- x8/x8
- x8/x4/x4
    
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post #4 of 9
If you wait for Ivy Bridge is will Support 16x/66x It will have Dbl The pcie lanes as Sandy..
Because Sandy is a mainstream socket.. Ivy is the highend socket like the current 1366.

Also nothing in Sandy is faster then a 980x.. So it would be a down grade for you..

Ivy wil have 4 core 8 core and 16core cpu's.. With HT..
    
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by Hokies83 View Post
If you wait for Ivy Bridge is will Support 16x/66x It will have Dbl The pcie lanes as Sandy..
Because Sandy is a mainstream socket.. Ivy is the highend socket like the current 1366.

Also nothing in Sandy is faster then a 980x.. So it would be a down grade for you..

Ivy wil have 4 core 8 core and 16core cpu's.. With HT..
Ah ha! Now I have something to look forward too! Thanks!
    
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post #6 of 9
Quote:
Originally Posted by 4Brand View Post
Yes, unfortunately 3- and 4-way SLI is out since Sandy Bridge LGA 1155 has the same amount of PCIe lanes like LGA 1156.

So therefore it's either:
- x16
- x8/x8
- x8/x4/x4
Boards with the NF200 will support X16/X16, X8/X8/X8
    
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post #7 of 9
yes the NF200 double the bandwidth while increasing latency. Give and take.
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post #8 of 9
Quote:
Originally Posted by Sin0822 View Post
yes the NF200 double the bandwidth while increasing latency. Give and take.
it's worth it

    
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post #9 of 9
Thread Starter 
I think some added latency isn't a huge deal, i've seen this with my ddr3 ram. In all the tests i've seen the higher bandwidthalways outperformsthe lower latency i've experiencedthis myselfwith my system I was originally running corsair 1600 at 7-7-7-24 and when I upgraded to my gskill tridents at 2000mhz 9-9-9-27 I saw a nice boost in my memory performance, especiallyon benchmarks. So I'd imagine that. It would be similar to this.
    
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