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SLI on different speed PCI-E Channels

post #1 of 20
Thread Starter 
I'll be buying the Asrock H55M mobo for my future HTPC project. It includes 2 PCI-E x16 slots:
- one is a full x16, v2.0
- the other is a x16-sized, but running at x4, and v1.1.

I wanna use 2 GTS 450's on a SLI config with the SLI patch (since the mobo only does CrossFire). Will it work even tho the PCI-E slots are of different bandwidths and speeds? Will i experience any downs in performance in that setup? I will use the SLI cable if it matters (I've read it's obligatory anyways)
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post #2 of 20
x4 will negatively impact performance.
i suggest u switch to a more decent board.
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post #3 of 20
No it wont Dont listen to him
I have a 16x 4x and a actual sli 16x2 motherboard performance is the same at 1920x1200
post #4 of 20
Quote:
Originally Posted by solar0987 View Post
No it wont Dont listen to him
I have a 16x 4x and a actual sli 16x2 motherboard performance is the same at 1920x1200
Are you sure? x4 v1.1 is pretty limited bandwidth wise. Was your setup 1.1 or 2.0 x4?
 
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post #5 of 20
Thread Starter 
So, is it good or bad? i see one bad, one good, and one "limited bandwidth" which sounds like a "maybe".

I won't be gaming heavily on them, so i wouldn't mind a slight and acceptable decrease on FPS's
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post #6 of 20
You should be fine, x4 2.0 slots don't restrict very much bandwidth at all.

Why not just buy a micro atx board that has native sli though? It would be much easier and plus, you know for a fact that it would work. The sli hack isn't always 100%, and things can go wrong.
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post #7 of 20
I've read that 16x/8x is fine, but 16x/4x can hamper performance. I personally haven't tried.
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post #8 of 20
Quote:
Originally Posted by Behemoth777 View Post
You should be fine, x4 2.0 slots don't restrict very much bandwidth at all.

Why not just buy a micro atx board that has native sli though? It would be much easier and plus, you know for a fact that it would work. The sli hack isn't always 100%, and things can go wrong.
the OP specifically said x4 at 1.1 speeds. that is like x2 at 2.0 speeds so no.
board won't even support crossfire
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post #9 of 20
Quote:
Originally Posted by james8 View Post
the OP specifically said x4 at 1.1 speeds. that is like x2 at 2.0 speeds so no.
board won't even support crossfire
The link to the board that he provided shows that it runs at 2.0, not 1.1.
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post #10 of 20
sli wont work at all, the 4X slot is routed through the southbridge, while the 16x is direct to cpu.
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