modify crossfire of radeon 4870 X2

I bought a computer with 2 radeon X2 with NO crossfire formation. It works well for over a year then recently I got major problem with booting.

It seems that one of the radeon has problem:

1. Device manager shows that both are working properly. But if I disable one of them then enable it again then one of the radeon brings the computer into safe mode, the other is fine.

2. The CCC shows that there are a primary adapter and a disabled adapter. A graphics benchmark software says that one of the adapter is off port.

When I disable the bad adapter, then my computer boots fine. Is one of the radeon really bad even device manger says it is working properly?

Also, my computer gives a warning about crossfire has been enabled. But how do I check of modify the crossfire status?

My computer:

winXP pro x64
AMD phenom II X4 955
CPU 3.21 GHz 7.99 GB RAM
2 radeon HD 4870 X2 1gig of RAM each at non crossfire formation.
2 hard disks in raid 0

 

Best bet is to get the manuals for your motherboard and the graphics cards, read through any sections relevant to your situation, but if it is my own hardware, I read through the whole manual.

AMD sell their graphics chipsets to many graphics card manufacturers, do you know who made the graphics cards, the model number (4870 is the model of the GPU, the Graphics Processing Unit), etc? If you can't find the information in Windows or by a hardware identification program (like SIW), you can take one of the cards out, the make and model will be printed on the card.

You should do testing by swapping the cards or using one at a time. I had a somewhat similar situation recently and found a dust build-up in one of fans/heatsinks of one of the cards. Check for dust build-up.

I might wonder if it could be a power problem.

Having Crossfire or a single card might have settings in the BIOS, another reason to find your manuals.

Matt

 

I could have easily called the seller to ask but unfortunately it was robbed some time ago and apparently stops working. You know the company name is Vigor gaming in California. So I will have some reading to make. But I am not in a rush to do it since the computer plays games well with just one 4870. I even think that it runs smoother with one radeon than with 2 radeons. The fan now blows cool air out instead of warm air as it did before with 2 radeons running.

I may want to pick up a single radeon 5870. This seems a very good card. And do you know which brand is the best for 5870?

 

try here:

http://www.digitaltrends.com/video-card-reviews/xfx-radeon-hd-5870-review/