Pci e 8 x 8 vs 16 x 16

[NameTaken45]

i ordered a maximus II formula and as you probably know its pci e 2.0 8 x 8.
i was planning on ordering two 4870s for xfire. i was just wondering if the 8 x 8 will bottle neck the cards. and if so, how much? would i be better off only getting one 4870 x2? i really like running SLI/Xfire and including them in my LC loop for my Build log. any info would be appreciated, thanks.

[nzbleach]

Might lose 50-100 points in 3dmark.

[zanzabar]

with single gpu cards u wont notie anything with quadfire it would be noticeably slower than 16x16

[burebista]

Take a look.

[NameTaken45]

wow, great link. it looks like the p45 with xfire on the maximus II actually does pretty good/better against the other chipsets. thank you

[tiro_uspsss]

u'll be fine

[kill_a_wat]

Awesome link I have been curious about the dual 8x vs dual 16x PCIE issue.

Gee there really isn't that much difference...

[Clint]

I'm not so sure about the test, did they really use two 4x PCI-E or one 16x and one 4x on the P35 board? Kind of vital difference there.

[burebista]

16/4 it seems.
Anyway, on Legion Hardware were tested 2 HD4850.

[Clint]

16/4 it seems.
Anyway, on Legion Hardware were tested 2 HD4850.

Yeah, that's what I thought. He persists calling it "dual 4x lanes" in the thread though.

[humeyboy]

No issues on P45 as its PCI-E 2.0 unlike the P35 with PCI-E 1.0/1

No GPU today will saturate its bandwidth (a review last week or so ago) finally showed this.

[NameTaken45]

well this is all good news, thanks guys

[screwtech02]

Seems to be no info on "quadfire" on the P45 2.0.....

[mastrdrver]

Seems to be no info on "quadfire" on the P45 2.0.....

There was someone who noted on the [H] forum that he went from P35 to P45 with his 4870x2 and noticed zero difference with the faster bus. So, I would think that even an X2 doesn't get bottlenecked by 8x PCI 2.0 in game play.

[screwtech02]

With 2 4870x2's???

[NameTaken45]

links would be good.

[mattkosem]

With 2 4870x2's???

I'm curious about that too. I'd love a second 4870 x2 if it won't be bastardized by x8 slots.
--Matt

[screwtech02]

I just rechecked my 03 scorews between my P5E, and MIIF. There is a 1500 point difference between the x8/x16 setups. Most noticible was the texture fill rates, they were taking a hit on the P45 setup.... Although i dont know if it would be that noticible in a "real world" gaming test.. It's too bad that the P45 clocks quads better than the X38/48. Maybe Foxxcon will get their act together with the Avenger, although my hopes are not high....

[PakaPaka]

check out this links :

http://www.tweaktown.com/articles/14...nce/index.html
http://www.xtremesystems.org/forums/...d.php?t=202249

[screwtech02]

At least the xtreme post used 2 x2 cards, and being able to actually push a quad further on a p45 imho, greatly outweighs the performance hit it takes on the x8 setup with 2 x2 cards.....

[adpr_02]

Take a look.

Geez, good thing I'm upgrading from my p35 soon .

[mastrdrver]

With 2 4870x2's???

No just one but since P35 is 16x 1.1 then 8x 2.0 should be similar.