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Noob question: What is the point to make 3-Way, 4-Way Sli if motherboards don't support as much as that?

post #1 of 3
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Many boards, XL-ATX has 4 - 6 PCI-E slots, but the don't work 16X speed together, but 16,8,8,8 or 16,16,0,0 and so. It's confusing, so install 4 GTX TITAN isnot able? why to make those boards with so many PCIE if they won't work ok together?

Very noob question as i said.

Also, is this a good board to do 4-Way Sli 780?

http://www.amazon.com/MSI-Motherboard-BIG-BANG-XPOWER-II/dp/B007JLCKFG/ref=sr_1_12?ie=UTF8&qid=1377057800&sr=8-12&keywords=x79


Edited by Sujeto 1 - 8/20/13 at 9:07pm
post #2 of 3
Quote:
Originally Posted by Sujeto 1 View Post

Many boards, XL-ATX has 4 - 6 PCI-E slots, but the don't work 16X speed together, but 16,8,8,8 or 16,16,0,0 and so. It's confusing, so install 4 GTX TITAN isnot able? why to make those boards with so many PCIE if they won't work ok together?

- There are people that use those PCI slots for other than GPUs... You can have single GPU + PCI SSD like OCZ Revo Drive or ASUS RaiDR...
- Even if the board defaults to 16x-8x-8x-8x... It's still plenty of bandwidth for the GPUs.
- Correct me if I'm wrong, but Titan's only go 3-Way SLI.

Quote:
Originally Posted by Sujeto 1 View Post

Very noob question as i said.

Not such a thing... The only "bad" question is the one someone doesn't ask. smile.gif
Quote:

It would be, but if you're concern is the 16x-8x-8x-8x thing; just go for Asus Rampage IV Extreme... That one does 4 way SLI with all PCI lanes at 16x.

http://www.amazon.com/Rampage-IV-Extreme-Extended-Motherboard/dp/B0061XSBZ6/ref=pd_cp_pc_2
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post #3 of 3
Even now graphics cards will not utilize the full bandwith of a 8x8x8x8x pci-e 3.0 configuration. You have a number of PCI-e lanes provided by a processor and some that are handled by 3th party chips on some motherboards. So say you have a 3930k which supports 40 PCI-e lanes. This gives you a lot of options for configuration. You could do 3 GPU's @ 16x 16x 8x =40 or 4 GPU's @ 8x 8x 8x 8x and 1 4x peripheral=40 so you get multiple configurations for GPU, Raid Cards, Sound Cards. ect.
 
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