ATI Crossfire Info

In case anyone is using Crossfire or is considering it, there is a problem if you have more than 4GB of RAM. Chances are, this would lead to you having a BSOD that recognized the problem as atikmdag.sys and will proceed with a physical memory dump.

If anyone needs further guidance on this, please feel free to let me know. I spent 2 days working with this problem, only to find that the solution was a simple as removing some RAM.

Is the problem affecting Vista 64 Bit or 32 or both?

Have you tried SP1 RC to see if that will fix the issue?

I've only experienced it on 64-bit. Obviously, >4GB RAM on 32-bit is rather pointless anyway. I haven't tried SP1 RC. It seems to be more a driver issue than a Vista problem; I say this based on it's limit to Crossfire functionality. ATI is aware of the issue. Once the full release of SP1 is out, I'll install and give it a go, but don't bet on it helping.

You are aware of the Vista 64 issue with over 3 GB of RAM installed, right?

What do you mean? You can support more than 4GB of addressable memory space on a 32 bit OS.

What issue do you speak of? I installed Vista 64 Ultimate on this machine (4 GB of RAM) without any issues what so ever. Rock solid.

Did you have all 4GB of RAM installed during the formatting process?

i have 4gb of ram and have had since the format and install of x64

and i have never had a problem either

so my question is the same... what problem do you speak of??

RellikZephyr

In fact, I had 6GB of RAM in during the formatting process. There were no issues with anything until I enabled Crossfire. The second Crossfire enabled, the computer went a little haywire. Safe mode worked because it does not have Crossfire support. I am quite sure it is a driver issue. Something in the way ATI did its coding does not square with the additional RAM.

And Richard, I'm pretty sure the maximum supportable is about 4GB, but that includes your video card and sound card (if you've got memory there) and one or two other things. So, realistically, they toss the limit to around 3.5GB. Unless you know something everyone else doesn't.

Maybe I do ...

http://www.microsoft.com/whdc/system/platform/server/pae/default.mspx

Not all Msft products will push support beyond 4GB, you can get up to 128 GB of addressable memory support in some 32 Bit products.

Oh, and to answer your original question... Yes. I had all 4GB in from the start of the install process.