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HD4850 crossfire dual x8 versus x16

Last response: in Motherboards
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August 1, 2008 1:34:37 AM

i've seen so many benchmarks etc. about dual x8 vs dual x16 and i've gotten so many different results.

i recently bought a 4850 and i'm using it on my pci-e 1.0 motherboard at the moment. (which is performing amazingly well. runs crysis very high and is totally playable.) gpu-z says i'm getting 67.2 GB/sec bandwidth. i don't have anything to compare that to though, is that good/bad?

i'm looking to get a 4850 crossfire setup and was looking at this board
http://www.newegg.com/Product/Prod [...] 6813130172
which runs x8/x8. it's really cheap for a pci-e 2.0 board, but would it be worth it to get a board that runs x16/x16?
the x16/x16 ones i've seen are basically twice as much. is it worth it?

OR

if i don't go the crossfire route would it even be worth it to buy a new motherboard to upgrade to pci-e 2.0?


thanks :sleep: 


p.s. i did also post this in the graphics cards forum; multiple opinions are always nice.
August 7, 2008 7:48:44 PM

I haven't used GPU-Z much but if it is of any help to you, im on PCI-E 2.0 x16 and GPU-Z reports the exact same number for me (67.2GB/sec). Only when I overclock will it break into the lower to mid 70's. So I'd say considering your 1.0 spec, you're doing very well and might not even need to upgrade at all. I think 2.0 is really getting ready for the future, if anything else.

I couldn't locate the board you linked, but from reviews and what I've heard, P45 boards are an extremely good value and offer outstanding performance at 8x/8x. This is only edged out by an X48 of course, which supports 16x/16x and probably has an advantage as you start creeping into higher resolutions. I wouldn't say the difference is that dramatic though. I went X48 because im a spec junkie, but the reasonable person inside me would have bought a P45 board, like an Asus P5Q Pro.
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