Sign in with
Sign up | Sign in
Your question

Sli and x16 x16

Last response: in Graphics & Displays
Share
March 17, 2011 10:10:40 PM


Hi

I own a MSI P67A-GD65 motherboard. The specs state there are 2 x PCI-E 2.0 x16, So i assume you can run two graphic cards at x16.

I have two cards working fine together but when I use GPU-Z to find out what the cards are running at there running at dual 8x 8x..is this correct or should they be able to run at 16x?

If they can how do you turn them on?

Thanks


More about : sli x16 x16

a c 179 U Graphics card
a b V Motherboard
March 17, 2011 10:19:09 PM

8x/8x is correct, the Sandy Bridge chips only have 24 PCI-E lanes that have to get split to all the slots, so the two 16x slots are physically 16x and electrically 16x as well, as long as only one of them is in use, if both are in use they split the 16 lanes 8 and 8 which gives you a small performance hit but its pretty small(2-5%) only AMD 790FX and 890FX and Intel X58 chipsets are capable of 16x/16x crossfire or SLI.
Related resources
a c 106 U Graphics card
a b V Motherboard
March 17, 2011 10:40:18 PM

Pretty much you need another motherboard if you want to have 16x/16x SLI. It would give you a small performance increase, but of course isn't really worth the cost of getting a new motherboard.
a b U Graphics card
a b V Motherboard
March 17, 2011 10:50:55 PM

JackNaylorPE said:
Sandy Bridge chipsets are in fact capable of twin x16 but it requires an additional NF200 chip on the MoBo. Look for MoBo's like the Asus WS Revolution

http://usa.asus.com/product.aspx?P_ID=dzgoion0wgHoT7tp
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


It's different Jack. The NF200 is a repeater, so that cards that use identical data get full bandwidth. If you were using the cards for two different things, you would still be limited to a total of 16 lanes, with bandwidth distributed based on traffic stats.
March 17, 2011 11:22:43 PM


Fair enough..Did't know this and when I brought my motherboard I thought having two slots at 16x was all i needed and websites don't report them running in dual 8x..like you see on other motherboards
March 17, 2011 11:25:42 PM

Dont believe all the 16x16 hype. It has been proven time and time again that performance you lose is negligible. Like 2 to 5% in synthetic benchmarks. The x58 elitest wanted to push that it mattered so much and when the benchmarks started rolling out, they went back into their holes.

Dont worry, just game. Your fine.
a c 271 U Graphics card
a b V Motherboard
March 17, 2011 11:32:20 PM

silky salamandr said:
Dont believe all the 16x16 hype. It has been proven time and time again that performance you lose is negligible. Like 2 to 5% in synthetic benchmarks. The x58 elitest wanted to push that it mattered so much and when the benchmarks started rolling out, they went back into their holes.

Dont worry, just game. Your fine.

I still think that it matters, especially if people are after 'maximum' performance.
March 18, 2011 8:59:03 AM

Mousemonkey said:
I still think that it matters, especially if people are after 'maximum' performance.


2% of 60fps is a whopping 1.2 fps loss. So youll be gaming at 58.8 fps. Im gaming on an I7-860 machine with dual 460's. Im getting over and above the performance of an 580. Trust me, im not missing that 1.2fps.

Like I said, dont worry, just game.
a c 271 U Graphics card
a b V Motherboard
March 18, 2011 12:31:46 PM

silky salamandr said:
2% of 60fps is a whopping 1.2 fps loss. So youll be gaming at 58.8 fps. Im gaming on an I7-860 machine with dual 460's. Im getting over and above the performance of an 580. Trust me, im not missing that 1.2fps.

Like I said, dont worry, just game.

You can bet your bottom dollar that there are people who will lose sleep over that 1.2fps loss! :lol: 
!