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x4 Vs x8 x8

post #1 of 11
Thread Starter 
How much slower is the x4 then the x16 x16 or x8 x8
and is it x4 x4 or x16 x4
    
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post #2 of 11
I'm not sure how much slower it is but most motherboards have a x16 as a primary and maybe another PCIe x?. I was informed here in one of the threads that there is no noticeable difference between x16 and x8. So they say that you can't tell the difference between two GPUs in crossfire whether the board is running x16 x8 or x16 x16. Now you have to be able to notice the difference between x16 and x4, but who knows, seems like a gimmick to me. All FX boards have 2 x16 slots and the others like GX and such will have 1 x16 and maybe a x8 or x4.
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post #3 of 11
check this... You are lucky that I actually found the address. I had buried it in some Doc file . A 480 sli configuration on 4x-4x mobo ( old boards) wont differe much from 16x-16x configuration ( in single display setup). if 4x-4x wouldn't bottleneck then nothing does XD . 16x-4x which is the norm for low and mid-range boards would be much better !

http://www.hardocp.com/article/2010/...16x16_vs_x4x4/

A tad shocking, ain't it ? ^^
Edited by luches - 2/17/11 at 5:21pm
post #4 of 11
Wow that is interesting..
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post #5 of 11
My gigabyte 870 has 16x / 4x and it doesn't seem to bottleneck my 5770s, but 5770s aren't very powerful. Depends what cards you want to put in there.
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post #6 of 11
1. it is 16x4x usually

2. It is not much slower until you get to high end cards.

Here is a nice review:
http://www.overclock.net/ati/773426-...ci_e-slot.html
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by RichardS View Post
My gigabyte 870 has 16x / 4x and it doesn't seem to bottleneck my 5770s, but 5770s aren't very powerful. Depends what cards you want to put in there.
So two 5770's would be good??
Quote:
Originally Posted by reflex99 View Post
1. it is 16x4x usually

2. It is not much slower until you get to high end cards.

Here is a nice review:
http://www.overclock.net/ati/773426-...ci_e-slot.html
Would it be fine with Two 5870's or 6970's maybe in the future
    
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post #8 of 11
You would probably notice like a 10-20% decrease with higher end cards
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post #9 of 11
Quote:
You would probably notice like a 10-20% decrease with higher end cards
No it wont .... a 4x pci-e 2 barely bottlenecks a 480 ( 4% maby) . for a 580 it might become 7% bottleneck which is still negligible .


read the review I posted, its solid proof ^^ : http://www.hardocp.com/article/2010/...16x16_vs_x4x4/

----------------------
you would be fine even if you CF a pair of 6970 ... the overall performance drop would be about 6% that's all ( on a 16x-4x board). maby even less
Edited by luches - 2/18/11 at 1:03pm
post #10 of 11
Ok then. Learn new stuff all the time.
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