I think I know what the issue is and how to solve it!
Like a lot of other folks I have had issues with this card.
The first problems showed when playing Bioshock. Regular crashes to desktop or total system shutdowns occured within a few minutes of gameplay. I went through a lot of testing and fault finding and eventually came up with a working solution.
1. The card is power hungry and a 12V rail of 30A minimum is recommended.
A. I swapped the PSU and gained a limited amount of stability.
2. The card runs very hot and the heatsink design, particularly on the Sapphire Radeon card, does not allow a proper contact with the VR chips. In addition, if you remove the original heatsink you may not have any cooling at all on the VR chips using an aftermarket VGA cooler. The Arctic Cooling X2 is an exception to this, with a heat spreader supplied.
A. I cut off the part of the original heatsink with the VR cooling pads on and thermal glued it in place. The Zalman cooler does not have a provision for VR chip cooling.
3. There is some sort of chip almost directly behind the GPU on the reverse of the card, near the AGP slot. This also gets very hot and came under suspicion of being a problem.
A. Stuck a heatsink on it.
Now some of these 'solutions' seem a bit DIY, but they do work. The card now runs rock solid in Bioshock and 3DMark06.
If you are thinking of upgrading the cooling, then I would advise on making sure you get a VR chip heat spreader, a la AC X2. I have also seen a Radeon O/C'd X1950 PRO with a gold VR chip heat spreader fitted.
If you have a stock card and you have issues, the chances are that its heat or power related. First try another PSU that's man enough for the job, if no luck, then consider RMAing the card for another type.
Like a lot of other folks I have had issues with this card.
The first problems showed when playing Bioshock. Regular crashes to desktop or total system shutdowns occured within a few minutes of gameplay. I went through a lot of testing and fault finding and eventually came up with a working solution.
1. The card is power hungry and a 12V rail of 30A minimum is recommended.
A. I swapped the PSU and gained a limited amount of stability.
2. The card runs very hot and the heatsink design, particularly on the Sapphire Radeon card, does not allow a proper contact with the VR chips. In addition, if you remove the original heatsink you may not have any cooling at all on the VR chips using an aftermarket VGA cooler. The Arctic Cooling X2 is an exception to this, with a heat spreader supplied.
A. I cut off the part of the original heatsink with the VR cooling pads on and thermal glued it in place. The Zalman cooler does not have a provision for VR chip cooling.
3. There is some sort of chip almost directly behind the GPU on the reverse of the card, near the AGP slot. This also gets very hot and came under suspicion of being a problem.
A. Stuck a heatsink on it.
Now some of these 'solutions' seem a bit DIY, but they do work. The card now runs rock solid in Bioshock and 3DMark06.
If you are thinking of upgrading the cooling, then I would advise on making sure you get a VR chip heat spreader, a la AC X2. I have also seen a Radeon O/C'd X1950 PRO with a gold VR chip heat spreader fitted.
If you have a stock card and you have issues, the chances are that its heat or power related. First try another PSU that's man enough for the job, if no luck, then consider RMAing the card for another type.