• P8Z68 V-LE 16x , 4x Crossfire Bottleneck or new motherboard?
    8 replies, posted
Recently, i built a PC so that I could play bf3 at 1080p 1920 x 1080. It runs at ultra at around 25FPS. My GPU is an AMD Radeon Sapphire 6870 and my mobo is a P8Z68 V-LE. I am aware that the V-LE has two slots for dual GPUs, a 16x and a 4x slot. Would it be worth it if i got another 6870 and crossfire or would it be better to get a P8Z68 v-Pro mobo (16x,16x) then crossfire? So basically, is the bottleneck of having a 4x slot so terrible that I should get a new mobo?(i have an I7 2600k so i know that's not the problem)
[IMG]http://img832.imageshack.us/img832/9763/multigpu.jpg[/IMG][IMG]http://img84.imageshack.us/img84/5070/singlegpu.jpg[/IMG] The bottleneck isn't too bad. 8x/8x is better then 16x/4x though. Not enough to make it not worth crossfiring. 6.5% lose in performance compared to 8x/8x.
[QUOTE=4RT1LL3RY;33442668][IMG]http://img832.imageshack.us/img832/9763/multigpu.jpg[/IMG][IMG]http://img84.imageshack.us/img84/5070/singlegpu.jpg[/IMG] The bottleneck isn't too bad. 8x/8x is better then 16x/4x though. Not enough to make it not worth crossfiring. 6.5% lose in performance compared to 8x/8x.[/QUOTE] Thanks. Someone had told me that a 4x slot was like a 25% bottleneck. Thanks for being so helpful.
it depends entirely on the cards being used and how much bandwidth they need with 6870s I doubt you'd be able to tell without comparing the numbers directly, maybe a couple FPS
[QUOTE=reapaninja;33444619]it depends entirely on the cards being used and how much bandwidth they need with 6870s I doubt you'd be able to tell without comparing the numbers directly, maybe a couple FPS[/QUOTE] d Thanks, I thought it was such a big deal that it was a 4x slot
Most cards don't max out the bandwidth of PCIe, 8x PCIe is enough for most cards as long as its PCIe rev2. Remember on your motherboard you are using PCIe revision 2 or greater, so a 4x slot is equivalent to a 8x slot in PCIe revision 1.
[QUOTE=4RT1LL3RY;33447914]Most cards don't max out the bandwidth of PCIe, 8x PCIe is enough for most cards as long as its PCIe rev2. Remember on your motherboard you are using PCIe revision 2 or greater, so a 4x slot is equivalent to a 8x slot in PCIe revision 1.[/QUOTE] Oh, alright. So i should go for it and get another 6870?
Yeah, go for it. But remember that crossfire and SLI don't scale well in all games as well as some games having microstutter in dual card setups. For BF3 though it is supported well. Microstutter only matters at lower fps, like 30, above that you won't notice it. I definitely recommend it from a value standpoint. 2 HD6870 will give you a better framerate then a 580GTX in most games.
[QUOTE=4RT1LL3RY;33450916]Yeah, go for it. But remember that crossfire and SLI don't scale well in all games as well as some games having microstutter in dual card setups. For BF3 though it is supported well. Microstutter only matters at lower fps, like 30, above that you won't notice it. I definitely recommend it from a value standpoint. 2 HD6870 will give you a better framerate then a 580GTX in most games.[/QUOTE] Sweet! thanks bro
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