Radeon HD 6550D Xfired with HD 6670 - Worse performance score???

[brownd95]

Hi All.

Can someone please advise with the following:

I have a radeon HD 6550D onboard gpu

I seen on youtube it could be crossfired with HD 6670 dedicated card.

Its all set up but the windows experience index score and furmark score show the performance as being worse with both cards fitted in crossfire than just running the one.

Surely its meant to be double the speed now i have 2 gpus running???

Thanks,

 

[brownd95]

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1) Running crossfire

2) dedicated card Hd 6670 running on its own

 

[spixelspixel]

Windows experience and furmark mean nothing, test with a game to see if there's any difference.

 

[brownd95]

There is a benchmark test on mafia 2... could i run this under both conditions and see which one gives the highest fps??

The card running on its own so far is running at an average of 28-29 fps

Thanks,

 

[brownd95]

Ok here we go:

dedicated graphics card = 29fps

the 2 gpu's crossfired = 23-24 fps

Im shocked.

Could anyone give me an idea why this could be??

Thanks,

 

[spixelspixel]

Yes you can use that, or better yet try heaven benchmark 4.0

Download here http://unigine.com/products/heaven/download/

 

[Hyburnate]

I'm not too clued up on the APU, however can you disable the graphics and just run the graphics card on it's own? If so, try that and post back the results, it could be down to the APU holding back the dedicated.

 

[spixelspixel]

Ok here we go:

dedicated graphics card = 29fps

the 2 gpu's crossfired = 23-24 fps

Im shocked.

Could anyone give me an idea why this could be??

Thanks,

Judging by the screen shot posted on furmark it looks as if when you enable crossfire it's only using the 6550d

 

[brownd95]

Hi. If i set pci slot in bios and let windows load, test the mafia 2 game i get 29fps.

If i set the bios to onboard, and load the pc, in amd vision engine control centre ( dual graphics mode is automatically enabled), i try the same game and only 23-24fps.

cheers,

 

[brownd95]

spixelspixel I shall try that link you sent me cheers.

 

[spixelspixel]

Have you tried updating your graphics drivers? It's possible your current ones doesn't properly support crossfire with the onboard graphics.

Also try connecting your monitor to the onboard instead of 6670

Read this http://www.tomshardware.com/reviews/amd-a8-3850-llano,2975-2.html

 

[brownd95]

Hi again.

So after using Heaven Benchmark I found the following:

1) onboard gpu =
FPS:
6.2
Score:
156
Min FPS:
3.3
Max FPS:
13.9

2) dedicated gpu =
FPS:
9.0
Score:
227
Min FPS:
4.8
Max FPS:
19.8

3) xfire both onboard and dedicated =
FPS:
12.8
Score:
321
Min FPS:
7.3
Max FPS:
30.0

So thanks very much for your help with this benchtest. You were right not to believe the windows experience index score.
Can I ask apart from fitting a more powerful graphics card, is there anything else I can do to up the fps??

Cheers,

 

[spixelspixel]

Not really apart from overclocking (use msi afterburner program for this). I'm not sure if its possible with the 6550d/6670 crossfire though.

The onboard graphics also performs better with faster memory as shown here
http://www.youtube.com/watch?v=z0Z7H1PYUkk

The best option though is to just get a new graphics card and don't use onboard at all.

 

[brownd95]

cheers spixelspixel