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What's going on with Crossfire??

Fuzz

Fuzz

Fuzz

Soldato
Joined
3 Aug 2003
Posts
15,921
Location
UK
Can someone explain what's going on here cos I am a bit :confused:

Boot pc.
turn off adwatch and msn
open crysis test program
Run program
Open gpu-z
take screenie
open paint, paste, save and close
These are the results..
crysistest-crossfire-disabled.jpg


open Catalyst control centre scroll down to crossfire and tick box.
Wait for it to make changes and OK

Run test program again
Open gpu-z
take screenie
open paint paste and save
These are the results.
crysistest-crossfired.jpg



Erm bit lost tbh
 
Your not giving use many details here. What motherboard, what drivers for ati(7.12 are the latest) and what processor at what speed? and anything else you can tell use).

Matthew
 
yeah depends on your CPU speed, does sound quite low though considering I got 48.655 on the very same test just using a single 8800 gts 512mb

Also, how come your PCI-E is set to x8 and not x16
 
I was more worried about the fact that the FPS DECREASED, when crossfire was turned on.
Why would telling you what the CPU is help?
Fair enough if you were just looking at the original FPS and thought it was low though, I wasn't sure to be honest, everyone keeps telling me the 1950's are crap.:(

Am on the laptop at the mo so will update the spec of what the thing is running when I get up out of my pit.:D

Will look also look into the 16 - 8 pci-e issue as well, I didn't notice that.
It is indeed a 975 M/B (intel badaxe rev1 I think)
 
if u have a low speed cpu and a high end gpu, your cpu will limit your gpu.

e.g i had a 6000+ @ 3gjhz then i upgraded to a quad core cpu @ 2.2ghz and i've lost some fps in some games due to some games only use 1or2 cores which would make my cpu limit my gpu
 
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Hey quick question for you nokinidea, what kind of crossfire performance do you actually get in crysis, or is the performance like you would get with a single card while actually playing the game.
 
very little difference between having it crossfired or not.

Had a look in the boot menu to find I cannot adjust the 8x/16x

pci-e-band.jpg


Not looked at updating drivers yet, will do that now.
 
8x is correct as you have 2x cards in, only runs 16x when running single card, when you have 2x cards installed for Crossfire, both lanes will run at 8x, as per the features chart in this review, and the basic features on the 2nd page.

Expansion slots:

(2) x PCI-E x16 (operates in 1x16 and 1x8 or 2x8 mode)
(1) x PCI-E x16 (operates in x4 mode)
(2) x PCI 2.3

http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2681
 
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I think they are set at 8x because both x16 slots are occupied, so the chipset automatically assigns 8 lanes to each slot. I think you will see an improvement when the 7.12s go on. I think they are the first decent set from ati for the x19xx cards for a long while! imo
 
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Dunno, why ive never really bothered going SLi/Crossfire, never been worth it as you don't get double, only reason its worthwhile now is because cards are so cheap, even though you don't get double performance, you do get decent performance for the price.

Take the GTX when it came out at £400 a pop, say that gets 150fps in a game so you add another for SLi, now for another £400 you would want another 150fps to give 300fps in total, but doesn't work like that, you would be lucky to get 200 in total, so another £400 for 50 or so frames extra, no thanks.
 
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nokinidea said:
I was more worried about the fact that the FPS DECREASED, when crossfire was turned on.
Why would telling you what the CPU is help?
Click to expand...

Basically because enabling crossfire has an overhead attached to it when enabled. Extra info has to be processed in order to get it to work, so if your cpu was only just dealing with supplying 1 gpu with data, now it has to deal with the crossfire overhead AND processing extra info to a second card. If your cpu hasn't got the guts, performance may be worse.

^^^ That's why I asked about the spec of your system :) ^^^

Other than that, I'm gonna say drivers most likely answer if your cpu is ok.

To be honest, the worst answer will be that you PSU isn't up to dealing with 2 cards so the cards aren't getting the power they need to do serious number crunching (honestly, this can be a cause). But that's the worst scenerio and we will deal with the cheapest (FREE :) ) options first :)

Matthew
 
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