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Crossfire MoBo's

post #1 of 9
Thread Starter 
Hey OCN,
I have a question that is need some help on about Crossfire and Sli on motherboards.
Sorry if this has been posted before (just post a link to a good source then thanks).

Anyways,
I plan to have a 3 way crossfire on my next build.
I decided one Maximus VI formula but when reading on the pci-E slots i found out that with one card it runs at-

one card-!6x

two cards- 8x8x

and at 3 cards it runs 4x4x4x only.

Since they have less possible bandwidth at 3 cards how much performance could i be loosing?

Or does it not make that big of a difference?

So could any one explain ot me how what the difference with (16x)-(8x8x)-(4x4x4x).

Thanks OCN help needed.

PS-

I plan to
have 3 r9-290x cards in crossfire
as soon as they fix the drivers with the cards.
post #2 of 9
the third x16 slot is going to ruin your performance...

it runs of the pch and isn't really supposed to be used as a gpu slot.

use 2 cards and see what performance numbers are like then pop in the third and compare.
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by Master__Shake View Post

the third x16 slot is going to ruin your performance...

it runs of the pch and isn't really supposed to be used as a gpu slot.

use 2 cards and see what performance numbers are like then pop in the third and compare.

Thanks, i don't have the formula yet so maybe i should just buy another board like the extreme VI or somthing else. with full 16x on all pci-e slots?
post #4 of 9
that's what i did...

i bought the maximus v extreme in case i ever needed the extra slots...

you may find out that most if not all boards on 1150 with a plx chip only allow x8x8x8x8 @ pci-e 3.0 but that's fine for today's and next gens gpus.
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by Master__Shake View Post

that's what i did...

i bought the maximus v extreme in case i ever needed the extra slots...

you may find out that most if not all boards on 1150 with a plx chip only allow x8x8x8x8 @ pci-e 3.0 but that's fine for today's and next gens gpus.
\


Thx, also could any one explain to me in detail way a pci-e 16 slot is divided when you add more gpus?

ty.
post #6 of 9
when the second slot is populated in most haswell/sandy/ivy/and p55 boards the cpu has to allocate lanes for it.

the cpu only has 16 lanes for gpus...so it has to split them between graphic cards.

im pretty sure the first section of the pci-e slot is responsible for the pci-e card getting recognized...

it is pin 1 side A pulled low to indicate card inserted.

http://en.wikipedia.org/wiki/PCI_Express#Pinout
Edited by Master__Shake - 11/11/13 at 11:46am
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by Master__Shake View Post

when the second slot is populated in most haswell/sandy/ivy/and p55 boards the cpu has to allocate lanes for it.

the cpu only has 16 lanes for gpus...so it has to split them between graphic cards.

im pretty sure the first section of the pci-e slot is responsible for the pci-e card getting recognized...

it is pin 1 side A pulled low to indicate card inserted.

http://en.wikipedia.org/wiki/PCI_Express#Pinout

Thanks,
So the CPU can only handle 16 lanes for the GPU's, so any extra added divides the 16 lanes between them?

How come some MoBO's support 4 way sli/cf with 16x like the maximus VI extreme.

Do they have dedicated splitters or something that can handle the extra lanes?

ty
post #8 of 9
they have plx chips that bifurcate the 16 lanes in to 32 lanes.

some people say it adds latency.

think of them as spitters.
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by Master__Shake View Post

they have plx chips that bifurcate the 16 lanes in to 32 lanes.

some people say it adds latency.

think of them as spitters.
'

Cool thanks for the info.
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