How to Troubleshoot? ATI Radeon HD 5770 (Dual Cards)

[natedp]

Hi, I ordered a custom built PC and selected to have x2 ATI Radeon HD 5770 in CrossFire mode and I have been having problems that I believe are linked to one or both Video Cards malfunctioning or something. They are both seated properly and fans working and the temperature and PSU isn't an issue.

My DXDIAG seems to only see 1 Display Device (or something?) cause they are both 1GB cards but DXDIAG is showing only 724MB.

Is there something I have to do in the BIOS or with Software to Enable/Initiate CrossFire mode for the 2nd card to kick in? I have CrossFire Mode turned on in Catalyst Control Center...

 

[stormy13]

When Crossfire is enabled it should only show as one card as it is two working as one.

The memory reading is a reporting error between the driver and Windows. An uninstall and re-install of the driver. It could also be a bug in the current driver you have installed. If it showed correctly in a previous driver then it is a bug in the current one, and likely disappear in the next.

Also when it does read correctly it won't show up as 1 GB either (don't forget that Crossfire or SLI for that matter doesn't double the amount of available video memory), but it will show up as a value of this,

http://www.sevenforums.com/tutorials/89278-video-memory-virtualization-brief-guide.html

P.S. it also isn't an AMD specific bug either as it has happened to Nvidia cards as well,

GTX 285 2GB only showing 768MB in DXDIAG

 

[natedp]

Thanks for the links stormy13, the Guide definitely clears up alot of confusion I have been having... though I am still frustrated as I basically had to stop using my practically brand new PC because I spent more time watching my PC restart than I did anything else on it....