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6950 in a 4x 2.0 slot

post #1 of 24
Thread Starter 
So this is killing my brain cells , im dieng for xfire .. yes i can max out most games ..crysis i can get 45-50fps avg on enthusiast i want to see fps in the 60's/70's and iv read so many threads regarding this but i just cannot get a solid answer before i go ahead and spend money on a second gpu .

If i was to take my 6950 from the 16x slot and put it in the 4x slot and run a few benchmarks to compare the performance to the 16x slot would i get an answer that way ? iv heard pcie 2.0 is the same as 8x 1.0 which is decent enough bandwidth and shouldnt bottleneck .. or will it ? id love an xfire setup its all i can think about but i dont want to change my motherboard .

my pcie freq is 130mhz and I DONT USE SATA OR USB 3.0 at all .. so the lanes should stay free for my gfx cards right ?

any answers + rep

Btw plz dont link me to something iv read before , iv gone through 20 pages in google to get a good answer and at the end i came here cos i couldnt find one .

has anyone literally tested this ? could someone plz be a legend and try it out for me if u have 2 6950's and a 16/4x board ...+ rep foreva
Edited by Xristo - 2/8/11 at 4:23pm
    
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post #2 of 24
Thread Starter 
Im not letting this be ignored and sent to the 2nd page in 10 minutes like last time , anyone ?
    
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post #3 of 24
If you bench your card in the x4 slot you should get a decent idea of how it will perform as a second card in crossfire. Personally, I wouldn't crossfire unless I had at least 2 x8 slots but some people have said the performance hit of x4 isn't huge but it does exist.
post #4 of 24
For a single HD6950, going from x16 to x8 in 1920x1200/1080, you might expect a performance loss of 4%-11%.

Data for HD5870:
4%: http://www.techpowerup.com/reviews/A...caling/25.html
11%: http://www.tomshardware.com/reviews/...ng,2517-6.html


For two HD6950s in x16/x4, it is not too optimistic, needless to say, basing on the above data.
For 2900XTs, it is about 13%-20% loss for 1920x1200 (http://www.bit-tech.net/hardware/graphics/2007/10). 2900XT is outdated and since it is much weaker than the 6950, it can form a 'lower bound' for reference. But this is just considering one factor, other factors like driver are not.

I think I have seen a more recent test. When I find it, I will post it here. In the meantime, I hope this helps.

Edit #1:
Here is some brighter data, showing a pair of GTX480s is not limited much by x4/x4.
http://hardocp.com/article/2010/08/2...16x16_vs_x4x4/

So far, my conclusion is that if you add a second 6950 to run in x16/x4, you will still get a large performance boost due to CF and your objective is met here. However, you will not get everything out of the pair. So, if you can swallow this second part, adding a 6950 is still thinkable.
Edited by windfire - 2/8/11 at 5:39pm
post #5 of 24
Why would you overclock your pci-e frequency?
I personally wouldn't touch it.

You won't see a huge difference since PCI-E isn't using the full bandwidth in the lanes it's given. What resolution do you plan on using? Eyefinity?

Have you attempted a Bios flash/unlocking it to an HD 6970?
    
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post #6 of 24
Thread Starter 
No eyefinity .. i just want high fps on my single monitor 1920x1080 , i overclocked my pcie to 130 just to see if it would give me extra performace , it didnt ..

as i said in crysis i get roughly 45fps avg maxed out , i want 60 , 70 fps smooth gameplay ... maybe the 2nd 6950 can make up for those fps ? if its only working at 90-95% thats still not a deal breaker to me .. hmmm * scratches head *
    
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post #7 of 24
I had a Crossfire setup for nearly a year.
Yes its damn worth it.

A 16X / 4X mobo will give you 94% of the performance of 16X / 16X mobo.
A 6950 doesn't outrun that setup, it would push your min FPS from 40's to mid 60's, it makes a great difference and hefty overclocks aren't needed when your rocking multiple GPU's. Some games nearly double in average frames.

Radeons scale like Rosie Odonnell's Menu.
I am gonna double up Q2 of this year.
Edited by amstech - 2/8/11 at 5:19pm
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post #8 of 24
hmm have to look into this since a buddy of mine was bummed he bought a 16/4x board gonna have to look into it some more now..
    
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post #9 of 24
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post #10 of 24
Quote:
Originally Posted by amstech View Post
I had a Crossfire setup for nearly a year.
Yes its damn worth it.

A 16X / 4X mobo will give you 94% of the performance of 16X / 16X mobo.
A 6950 doesn't outrun that setup, it would push your min FPS from 40's to mid 60's, it makes a great difference and hefty overclocks aren't needed when your rocking multiple GPU's. Some games nearly double in average frames.

Radeons scale like Rosie Odonnell's Menu.
I am gonna double up Q2 of this year.
94% of what you would get of 16X x 16X? Are you sure? I'm having the same question come to mind time and time again, I too have a 6950 but I will be using Eyefinty at full HD. May I have a link to where you got this information from? or is it from first hand experience, because I have had many people tell me that crossfiring in 16X x 4X will really bottleneck everything.
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