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P35 Crossfire - Page 2

post #11 of 22
Quote:
Originally Posted by jpark59 View Post
x38 chipset has better perfomance than P35 even when you use one single Graphic card.
There is supposed to be tighter northbridge timings on the X38, but the real world difference is like <1%.
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post #12 of 22
Quote:
Originally Posted by gobalr View Post
with my single 8600gt overclocked on a 4x lane, i got 5200 on 3dmark06, now with the 16x slot im getting 6500, so you tell me if it matters...
An overclocked card is always going to push more data. The 3850 is probably no more data intensive than an OCed 8600GT, and you saw what, an 16% improvement? I don't think a 16% bottleneck is terribly significant. Also, why were you running a single 8600GT in the x4 lane? Was this on the same motherboard?
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post #13 of 22
Quote:
Originally Posted by Schroedinger View Post
An overclocked card is always going to push more data. The 3850 is probably no more data intensive than an OCed 8600GT, and you saw what, an 16% improvement? I don't think a 16% bottleneck is terribly significant. Also, why were you running a single 8600GT in the x4 lane? Was this on the same motherboard?
Wait, so you're calling an HD 3850 as fast as an 8600GT now?


Yes it will bottleneck, yes you will see a performance boost, but its not worth it. You're going to get the same results if you use a 3650. (Which you can do now with CrossfireX)

PCIe 4x is about as fast as AGP 4x, so think about that for a second and reevaluate your opinion.
    
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post #14 of 22
Quote:
Originally Posted by mrtn400 View Post
It would just badly bottleneck the second GPU. And there's no telling if that will result in less, the same, or more FPS.
Don't be silly. Of course there will be a performance gain. I have tested this myself. I used to run 2900XTs on a P5K Deluxe board. I have a thread with benches to compare if you're interested, but it's worth it.
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post #15 of 22
Quote:
Originally Posted by Schroedinger View Post
An overclocked card is always going to push more data. The 3850 is probably no more data intensive than an OCed 8600GT, and you saw what, an 16% improvement? I don't think a 16% bottleneck is terribly significant. Also, why were you running a single 8600GT in the x4 lane? Was this on the same motherboard?
Different mobos... and for some 16% improvement in 3dmarks is a big deal...
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post #16 of 22
Quote:
Wrong.

X38 = P35 with two x16 lanes.

They have the same performance.
Bandwidth is not there for no reason.
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post #17 of 22
I would try to get a 3870, on the x16 and put your HD 3850 on the x4.
post #18 of 22
Quote:
Originally Posted by darksideleader View Post
I would try to get a 3870, on the x16 and put your HD 3850 on the x4.
That's not a bad notion actually. It's been shown that a 3850 + 3870 combo works quite nicely.
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post #19 of 22
First off, if there isn't an OC on that CPU, it's not worth having the second GPU. And secondly, i don't think that 425w PSU will be enough for Crossfire. Hell, it may even have troubles running one 3850 + an OC'ed CPU.

So i'd suggest an upgrade in PSU, and at least a 3Ghz OC on the CPU b4 u think about Crossfire. For now, a 3850 will have to suffice if u're looking for an upgrade.
Quote:
Originally Posted by alexgheseger View Post
That's not a bad notion actually. It's been shown that a 3850 + 3870 combo works quite nicely.
yes indeed.
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post #20 of 22
Quote:
Originally Posted by ian209 View Post
First off, if there isn't an OC on that CPU, it's not worth having the second GPU. And secondly, i don't think that 425w PSU will be enough for Crossfire. Hell, it may even have troubles running one 3850 + an OC'ed CPU.

So i'd suggest an upgrade in PSU, and at least a 3Ghz OC on the CPU b4 u think about Crossfire. For now, a 3850 will have to suffice if u're looking for an upgrade.


yes indeed.
Overclocking the CPU likely won't result in a noticeable performance increase in actual gaming--there will be differences in 3dmark scores, but any game now can run just fine on a 2180 at stock. There WILL be a noticeable performance increase with an extra video card though--like in crysis, for example (not saying they play crysis, only that it would benefit from the extra gfx card) and COD4 and such. Much more so than overclocking the CPU regardless of whether the second card will be operating at 4x or 16x speeds...
    
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