HD 5770 Crossfire - Showing 0% load on second GPU?

[anvilator2]

Hi folks.

Just yesterday did my first serious (serious for me is £500+ lol) self build. Part of the excitement of building the new machine was to run 2 GPU's in Crossfire. When I run 2 instances of GPU-Z, the second GPU is showing 0% load. Can't figure this one out, any suggestions would be much appreciated.

Setup:

Intel i7 930 2.80GHz @ 4.00GHz
Asus P6T X58 DDR3 Mobo
6GB XMS3 DDR3 Ram
Asus ATI Radeon HD 5770 CuCore 1024MB x 2 Crossfired
OCZ ModXStream Pro 700w SLI Cert modular PSU
Antec 300 case - running with 3 fans on low
Running on Win 7 64-Bit

2 monitors both plugged into same card (didn't work using 1 monitor/card)
1st monitor 1920x1080
2nd monitor 1024x768

GPU-z Readings:

Core Clock - 850.0 MHz / 850.0 MHz
Memory Clock - 1200.0 MHz / 1200.0 MHz
Temperature - 55.0C / 26.0C
Fan - 30% / 30%
Load - 98% / 0%
Temp #1 - 53C / 26C
Temp #2 - 59C / 23C
Temp #3 - 57C / 25C
VDDC Current % OCP - 30% / 9%
VDDC - 1.0000V / 1.0000V

 

[Meaker]

You have enabled crossfire in the CCC right?

 

[anvilator2]

Yes it's enabled in CCC, and when i select "Identify GPU" I get a big "1" on one monitor, and "2" on the other.

 

[Orcvader]

What are you stressing the cards with?

 

[anvilator2]

Currently just running a game called Aion with all settings to Max and AA at x8 in a heavily populated area. Maybe there is something else i could run that will test it better?

 

[BigBruiserAl]

your not using windowed mode are you?

 

[anvilator2]

Aha!! Yes, I was using Windowed fullscreen. I had no idea that would prevent it from working. Just switched to fullscreen and BAM! both GPU's are loaded fairly equally. Thanks very much for pointing this out to me, you guys are awesome

 

[jorzeh]

I know this might sound stupid but do you have the crossfire bridge installed on the cards and if so double check it's on both cards firm.

 

[jorzeh]

ow nice one hf xD

 

[BigBruiserAl]

Aha!! Yes, I was using Windowed fullscreen. I had no idea that would prevent it from working. Just switched to fullscreen and BAM! both GPU's are loaded fairly equally. Thanks very much for pointing this out to me, you guys are awesome

No worries dude glad thats all it was

 

[chief barker]

Sorry can somebody explain how it was running windowed fullscreen, and how do I check i'm not running it.

YES i'm NOOB personified.

 

[chief barker]

your not using windowed mode are you?

I have just tried BFBC2 and COD WAW and two instances of GPU-Z and my second card (5870) also shows 0% load (5970+5870)

What is happening with this windowed mode stuff chaps.

Please explain, thanks.

 

[chaotic_uk]

gpu-z seems broken as i get the same readings but crossfire works for me