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SLI on different speed PCI-E Channels - Page 2

post #11 of 20
Quote:
Originally Posted by redhat_ownage View Post
sli wont work at all, the 4X slot is routed through the southbridge, while the 16x is direct to cpu.
He's using the sli patch.
post #12 of 20
Quote:
Originally Posted by Behemoth777 View Post
The link to the board that he provided shows that it runs at 2.0, not 1.1.
H55 is just like P55 where the x4 slot is run through the PCH. Although it is shown in Windows as 2.0 it is actually 1.1 bandwidth only. (EDIT: The link to the board specifically states 2.5GT/s which is also 1.1 spec)
Edited by theonedub - 3/11/11 at 7:05pm
 
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post #13 of 20
Quote:
Originally Posted by theonedub View Post
H55 is just like P55 where the x4 slot is run through the PCH. Although it is shown in Windows as 2.0 it is actually 1.1 bandwidth only.
yeah but he's referring to the speed not the size.
post #14 of 20
it does not matter what speed its at, the drivers will not let you run sli on a slot that runs through the pch, patch or no patch.
post #15 of 20
Quote:
Originally Posted by Eagle1337 View Post
yeah but he's referring to the speed not the size.
I am talking about speed.
 
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post #16 of 20
The short answer is this:

At lower resolutions, the PCIe channel speed difference will incur a larger performance penalty. You will experience less performance penalty at higher resolutions.
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post #17 of 20
Don't know why this hasn't been brought up already but why don't you just get one more powerful card rather than 2 450s? If I recall correctly 2 450s were only slightly faster than 1 460 so I would go with one faster card rather than two slow one that will probably be bottle necked by your PCI lanes if they are even faster or work on your board in the first place. Even if you already have the 450s or got a good deal for them you might wanna see how much you can sell them for and look into one faster card.

Quote:
Originally Posted by korosu View Post
The short answer is this:

At lower resolutions, the PCIe channel speed difference will incur a larger performance penalty. You will experience less performance penalty at higher resolutions.
The PCI bandwidth scaling testing done at HardOCP lead to the opposite conclusion if I recall correctly I'll try and find it. Here it is, my interpretation of their tests and conclusion is that it effects high resolutions more than low resolutions
Edited by juano - 3/11/11 at 7:17pm
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post #18 of 20
Thread Starter 
Quote:
Originally Posted by james8 View Post
board won't even support crossfire
It does support Crossfire, check the link i provided.

Quote:
Originally Posted by juano View Post
Don't know why this hasn't been brought up already but why don't you just get one more powerful card rather than 2 450s? If I recall correctly 2 450s were only slightly faster than 1 460 so I would go with one faster card rather than two slow one that will probably be bottle necked by your PCI lanes if they are even faster or work on your board in the first place. Even if you already have the 450s or got a good deal for them you might wanna see how much you can sell them for and look into one faster card
I'm actually space-limited. i can't afford to have a 2-slot video card, and even if i can't use the second 450, i could use it as a physx card/boinc card/just plain sell it. I'm actually getting the 1-slot MSI GT 450's.

Unless there's a better Nvidia 1-slot card, i have no other thing to do than to stick to them.
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post #19 of 20
ok cool dont listen to me let the kid spend his money on a second card that will not work in sli. i will just sit here in the corner with a piece of paper with the words "i told you so" on it tied to a brick aimed at your head.
post #20 of 20
There is actually a single slot 460, the galaxy razor it's way over priced but still an option if you need it. I don't understand how you can accommodate 2 single slot cards but not 1 dual slot card?

EDIT: These 5770 would be a better single slot card to pair up if your set on doing that because they were faster than 450s, but like I said I would try and find a way to accommodate a single dual slot card because your going to be paying more and compromising in a lot of areas to get what you want.
Edited by juano - 3/11/11 at 7:30pm
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