Crossfire only 50% gpu usage

[emosun]

When I'm running crossfire and monitoring the gpu usage it will only be roughly 50% across both gpu's. This seems to happen with two different machines I have.

Turning the graphical setting in the game up or down doesn't make the gpu's work any harder. They seem like they are throttled at 50%. With a single gpu it'll reach 99% usage by itself just fine. But with two it's almost as if each card is trading the next frame with each other thus meaning it's only working half as hard.

When i run passmark in crossfire both cards will use 100% usage so I know crossfire is working fine.

[The Sloth]

not all games take advantage of crossfire/ SLI

[Electronics Wizardy]

What hardware, what gpu's, what games

[emosun]

1 minute ago, nerdslayer1 said:

not all games take advantage of crossfire/ SLI

thanks I'll keep that in mind if I use software that isn't compatible with crossfire.

[emosun]

6 minutes ago, Electronics Wizardy said:

What hardware, what gpu's, what games

i tried it on a pair of 2600's and 3870's with various games like dirt 3 , gta 5 , metro LL ect. all games with official crossfire support. it's like the crossfire profile isn't being efficient with how it splits the load

[Electronics Wizardy]

8 hours ago, emosun said:

i tried it on a pair of 2600's and 3870's with various games like dirt 3 , gta 5 , metro LL ect. all games with official crossfire support. it's like the crossfire profile isn't being efficient with how it splits the load

those are ancient cards now, I wouldn't even bother with crossfire.

[emosun]

Just now, Electronics Wizardy said:

I wouldn't even bother with crossfire.

wow thanks for the help that really addressed the issue

[Electronics Wizardy]

8 hours ago, emosun said:

wow thanks for the help that really addressed the issue

what is the rest of the system specs

 

What cpu + mobo?

 

what OS?

 

[emosun]

One machine uses a q6600/asus p5k/windows 7 and the other uses an i7 930/pegatron truckee/windows 7 or 10. Although both configurations are different they both exhibit the same issue of splitting the load between the gpu's in an odd way

[emosun]

I just tried dirt 3 , and with crossfire after the benchmark it claims the average fps was 40+ , and in single card mode it was 38.

HOWEVER , when in crossfire it looks absolutely nothing like 40+fps more like 20fps , while single card mode visually looks wayyy better.

[emosun]

any ideas?

I also just tried the original boarderlands , which yielded a full 50% fps increase with two cards instead of one. Even though the game doesn't have a crossfire profile and isn't very specific on crossfire compatibility it's had the only real solid performance boost so far.

could this have something to do with the cards not liking direct x 9 or 11?