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Damn, no good 3x GPU SandyBridge Motherboards? - Page 2

post #11 of 24
Err...wha? According to that graph, the card isn't bandwidth-limited until somewhere between 4x and 1x. Not sure how you can look at that picture and conclude that at 8x there is not enough bandwidth to keep the GPU busy all the time...that's clearly not what it says.

If the card was bandwidth limited you would be seeing linear scaling with FPS, not +2% performance from DOUBLING the bandwidth.
Edited by thefreeaccount - 1/9/11 at 1:20pm
post #12 of 24
I suppose i'll stay with x58, using 4 cards?
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post #13 of 24
dont worry about the loss of bandwith. it is minimal, and 3 x 580s are extremely fast anyway. also, if the motherboard is x16, x16, x8, the first 2 cards will perform at full bandwith, and only the last one will lose performance.
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post #14 of 24
Quote:
Originally Posted by RagingCain View Post
You are correct about performance loss, but plenty of boards are triple/quad x16 channel. Mine for instance is triple 16 with an 1x8 and 1x4.
Ah ok, I thought that due to the new architecture on SB that it SLI / CFX it bumps the lanes down to x8.

I think my mobo does that actuall...hmmmm...

(then again I dont't have one of them fancy dancy overclockin boards )
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post #15 of 24
Thread Starter 
Here you can see a test at multi-display of noticeable FPS drop of stock 480's running 8x vs 16x.





Now toss in 30% more bandwidth for an OC'd 580 versus stock 480's on those charts, you don't think the third 580 I want would seriously be limited in the 8x slot?

I will be pushing mega-pixels at 3x 30" screens so I am sure bandwidth requirement is very large. If it's less than 5% thats fine, but I have the suspicion based off of these numbers the performance drop will be at least double digit versus using 3x - 16x slots.
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post #16 of 24
Quote:
Originally Posted by d33r View Post
i thought the p67 classified has x16 x3 ...and the crosshair iv
Edit: From the looks of it neither of these news sources (See below) actually examined the mobo properly before posting, or something has changed since the photo was taken. However the P67 Classified looks to have a total of 3 16x/8x capable slots, however whether or not they all run at 16x if three cards are installed I can't say.


http://news.softpedia.com/news/EVGA-...d-173250.shtml

Another source:

http://www.hexus.net/content/item.php?item=28064


Edited by [\/]Paris - 1/9/11 at 2:06pm
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post #17 of 24
Thread Starter 
Quote:
Originally Posted by [\\/]Paris View Post
You are correct sir, in fact you may be under quoting the figures:

"Among the things that onlookers will notice [on the p67 classified] are four DDR3 memory slots, as well as six PCI Express x16 slots, likely linked to an nForce 200 bridge chip from NVIDIA."

http://news.softpedia.com/news/EVGA-...d-173250.shtml

Another source:

" Of course, it's pretty obvious from the black and red paint job and the inclusion of six full-length PCIe 2.0 x16 slots, which are almost definitely linked together with NVIDIA's NF200 bridging chip. "

http://www.hexus.net/content/item.php?item=28064

Keep in mind this board isn't out...yet.

There's a huge difference between physical x16 slots and them actually running at 16x speed. I highly doubt that board has more than two 16x speed slots.
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post #18 of 24
Quote:
Originally Posted by CallsignVega View Post
I will be pushing mega-pixels at 3x 30" screens so I am sure bandwidth requirement is very large. If it's less than 5% thats fine, but I have the suspicion based off of these numbers the performance drop will be at least double digit versus using 3x - 16x slots.
I may be wrong, but I thought that SLI didn't do multiple screens? Or is that outdated information?
     
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post #19 of 24
Quote:
Originally Posted by CallsignVega View Post
There's a huge difference between physical x16 slots and them actually running at 16x speed. I highly doubt that board has more than two 16x speed slots.
Lol... see my edit. O_O

I can't believe neither of these sources looked at the zarking picture...
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post #20 of 24
Thread Starter 
Quote:
Originally Posted by e_dogg View Post
I may be wrong, but I thought that SLI didn't do multiple screens? Or is that outdated information?
Not only is that outdated information, you need SLI in order to do multiple display surround.

Quote:
Originally Posted by [\\/]Paris View Post
Lol... see my edit. O_O

I can't believe neither of these sources looked at the zarking picture...
Ya, I saw that there are 3x slots that say 16x/8x. The problem is that doesn't tell you if all three can run 16x simultaneously, which is the problem all of the current P67 boards have.
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