QUOTE(k!nex @ Oct 30 2008, 03:35 PM)
wanna ask smtg,dis 4850X2 if use wif PCI-e 1.0 will drop how many % performance compare to PCI-e 2.0?
i play at 1280X1024 ressolution,with or without AA also can. i play games like lost planet, race driver:grid, need for speed series,juiced 2.i dun play crysis.
i'm using a 8800gt wif a P35 mobo. feel like wanna upgrade but scared my PCI-E 1.0 bottleneck dis 4850X2 by large margin.
Let's see... 10~20% performance loss if crossfire potential is shown to the max. PCI-E 1.0/1.1 DOES matter. We're talking about 2 GPUs through one slot here, so pci-e 1.0 x16 should be bottlenecking it.If I am right, one 4850 should consume the bandwidth of say.. pci-e 2.0 x6 or pci-e 1.0 x12. Hence, 4850x2 would need pci-e 2.0 x12 OR pci-e 1.1 x24(WHICH DOES NOT EXISTS).
pci-e 1.0 x16=pci-e 2.0 x8
pci-e 1.0 x32(IF it exists)=pci-e 2.0 x16... you get the picture.
If you don't get the picture, pci-e 2.0 has twice the bandwidth of pci-e 1.0.
pci-e 1.0 x16 might not bottleneck a 4850 but it sure would bottleneck a 4850x2.
However, rarely do people do reviews(or at least performance charts) regarding pci-e 1.1 and pci-e2.0. The one I found were on 4870x2 on pci-e 1.1 and pci-e 2.0 and that was the only one I found.
Well, the good thing is, you can be our lab rat then

. You'll need a new mobo eh?
QUOTE(S4PH @ Oct 30 2008, 05:51 PM)
i guess x2 is better than CF coz if CF sure got some bottlenecks.
What do you mean by bottleneck?? If you're talking about CPU bottleneck, you need the same amount of CPU power to power up a 4850x2 or a 4850 CF. It's the number of GPUs that matter, not the number of PCBs. If you're talking about bus link length... the difference is unnoticeable(dude the difference is just going to be 1 fps or something)
EDIT: Don't get mad at me if I say pci-e 1.0 and 1.1 interchangeably, the fact remains that pci-e 2.0 has twice the bandwidth of those two.
EDIT2:Hmm... I think we should be seeing pci-e 3.0 in 1 year's time?
Added on October 31, 2008, 6:16 pmQUOTE(bryanyeo87 @ Oct 30 2008, 07:33 PM)
Should I merge this thread with the HD4xxx discussion? Because I dont think there is a need for opening a HD4xxx x2 thread when there is already a thread discussing the HD4xxx series.
If you did merge the thread on R700 (4870x2) thread with the discussion, then I guess this is mergeable. However, we should bear in mind that there's an 8800gt thread out there, solely for 8800gt and 9800gt.. then again they are famous (r700 thread not so famous). Either this is merged or we create a 4850x2 discussion thread and merge it with that.
This post has been edited by blindbox: Oct 31 2008, 06:16 PM