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1156 xfire mobo advice please !

post #1 of 10
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hello everyone i just wanted to ask something ..

i have bought another 6950 and am now using 2 of them on my p55a-ud3 mother board which is 16x 4x .. adding the card improved my 3dm11 score from 6100 to 9555 . In games it dips as low as it would with a single card , not how i imagine crossfired 6970's to be .. first gpu hits 99% and the second one hits 85% max sometimes it sits lower at 50% even in bf3 on ultra which is a major concern cos i love that game i want steady 60fps on ultra and it still dips to high 30's frown.gif same as with single card . They should both be at 99% right ?

I noticed people with i7 870 and 2x6970 scored alot higher than what i did with 12,000+ points ..

This would be because of the 4x lane ? im looking to buy another motherboard tommorow its an MSI P55-GD80 it has 8x 8x .. my i7 870 @ 4.2ghz should not bottleneck the cards would it ? but most of the results on the 3dmark website prove it shouldnt .

i was considering getting an i5 2500k with an 8x 8x mobo , is it worth it ? or just get a mobo for my 870 ?

im in abit of a pickle ,
any input appreciated ! thanks
    
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post #2 of 10
Your current CPU is perfect for now, only upgrade if it's not going to cost you anything, I'm also not sure the 2500K would be worth going to as it should be a downgrade in some cases.

You're definitely bottlenecked if my 470s in SLI are anything to go by, I swapped my i3 for my brother's Q6600 and my 3DMark 11 score went up.
My score with 470s, x8 x8 and a Q6600 at 3.8.
My score with 470s, x16 x4 and an i3 540 at 4.41GHz

Look at the graphics score, 815MHz core in the second link rather than 800 but the first one is still around 1k higher with a CPU that doesn't run 3D apps as well as the i3.

Edit: Your CPU would only be the limiting factor in games that are very CPU dependant, your performance in BF3 should be either equal to the 2500K/2600K or so close that it makes no difference.
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post #3 of 10
I thought I hit edit thumbsdownsmileyanim.gif
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post #4 of 10
The lane difference may be it. One card is sending data directly to the CPU, but the other is going to the chipset then to the CPU, creating huge latencies and bottlenecks. The x8/x8 mobo should solve that problem.

Unless you are really itching to upgrade, there's no need. My 1156 i3 still can handle anything i throw at it without whining, so an i7 should have no issues with anything. Plus good P55 mobos are pretty cheap as of lately.
Quote:
Originally Posted by Mike-IRL View Post

I thought I hit edit thumbsdownsmileyanim.gif

That has happened to me as well tongue.gif
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post #5 of 10
Thread Starter 
Thanks for the advice guys will buy the Msi p55 motherboard tommorow .. yes they are cheap =) Msi isnt really my favourite brand but ill give it a go for the first time i guess .

I love my 870 , just curious to know since now im dealing with xfire if its capable of maxing out the two cards .. even on an 8x 8x board

I wish i chose x58 from the start
Edited by Xristo - 3/23/12 at 6:31am
    
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post #6 of 10
Quote:
Originally Posted by Xristo View Post

I love my 870 , just curious to know since now im dealing with xfire if its capable of maxing out the two cards .. even on an 8x 8x board

It should. My i3 can keep both of my 450's happily fed, and yes, the performance increase is noticeable from just a single card. Both are running 8x/8x btw.
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post #7 of 10
Thread Starter 
theres a big difference in bandwith usage between 2x gts450's and 2x 6970's though smile.gif

Im about to go buy a mother board in an hour , im hoping im making the right choice ..
    
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post #8 of 10
Quote:
Originally Posted by Xristo View Post

theres a big difference in bandwith usage between 2x gts450's and 2x 6970's though smile.gif
Im about to go buy a mother board in an hour , im hoping im making the right choice ..

My 470s get a similar score to other people's cards in Heaven on two x8 lanes but I only just noticed you're running eyefinity, that should mean 8x lanes make more of a difference.
Honestly I amn't sure how much difference they'll make with those cards but there should be a slight decrease in FPS compared to an x16 x16 board.

Edit: Probably about 5%, maybe less, like I say I'm not sure but it wouldn't be a huge decrease or anything.
Edited by Mike-IRL - 3/23/12 at 5:46pm
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post #9 of 10
Quote:
Originally Posted by Xristo View Post

theres a big difference in bandwith usage between 2x gts450's and 2x 6970's though smile.gif
Im about to go buy a mother board in an hour , im hoping im making the right choice ..
Well, an i3 can't feed a pair of 6970's... my build is balanced though, like yours.
Quote:
Originally Posted by Mike-IRL View Post

Honestly I amn't sure how much difference they'll make with those cards but there should be a slight decrease in FPS compared to an x16 x16 board.
Edit: Probably about 5%, maybe less, like I say I'm not sure but it wouldn't be a huge decrease or anything.

16x/16x lanes are meaningless unless you're using dual GPU cards. There are some benchmarks somewhere...

EDIT: Here they are smile.gif
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post #10 of 10
Thread Starter 
got the msi p55 GD80 , problem solved !!!

Bf3 on ultra , silky smooth 60fps .. and i went from 9555 to 10366 in 3dm11 .

While playing games it would drop to 30Fps , now it does not do this it stays at a constant 60 .. the 4x lane was restricting the card

I do not advise xfiring on 16x 4x after seeing the improvment i saw .

The thing is , the fps were pretty much the same 16x 4x and 8x 8x ..few fps difference and thats it

but !! now it does not create huge bandwidth bottlenecks that cause it to drop to 30fps under load thumb.gif

I never saw the card over 80% now it sits at 99% with my other gpu =)

I have been curious about this for so long , now i know 16x 4x do not work properly together no matter what is posted on the internet .. maybe for weaker cards but not 6970's .

thanks for the info , the first poster sort of made my mind up for me and im glad i went and bought a motherboard for my 870 rather than abandon it because its a great cpu , my setup eats bf3 alive now ! awsome.

P.s with the newboard i was able to go from 4.2 stable to 4.3 stable ! win win , the p55a ud3 was a crappy board , good quality but nothing to this one .
Edited by Xristo - 3/24/12 at 12:17am
    
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