Intermittent screen freeze with HD 4830

Hey there,

I build my own machine a few years ago, with an XFX HD 4830 graphics card inside. I've been impressed with the performance, but sadly it has caused continual hardware glitches, giving me a screen freeze about once a week, meaning I have to reset and lose all my data.

I've got an Intel DP43TF Motherboard with a Q9550 processor and 6gb of RAM. I'm happy with performance, no need for an upgrade there, just want to rid myself of this frustrating glitch.

Can anyone recommend a graphics card that will work with this combo, and fit the motherboard, and maybe be more likely to work. I use dual monitors through DVI to VGA adapters, and do a lot of graphics/video with occasional gaming.

Alternatively, any recommendations for hunting down the cause of the glitch...? I've assumed its the graphics card. I also get a brief screen freeze on resuming from standby also, which resolves after a few seconds.

Chris

EDIT:

APPROXIMATE PURCHASE DATE: now

USAGE FROM MOST TO LEAST IMPORTANT: Video editing, Photoshop, GTA IV, Fallout 3.

CURRENT GPU AND POWER SUPPLY: XFX Radeon HD 4830 512mb and 550W Gigabyte Superb 550P Power Supply

OTHER RELEVANT SYSTEM SPECS: Intel DP43TF Motherboard with a Q9550 processor and 6gb of RAM

PREFERRED WEBSITE(S) FOR PARTS: CCL COUNTRY OF ORIGIN: UK

PARTS PREFERENCES: whatever works

OVERCLOCKING: No SLI OR CROSSFIRE: No

MONITOR RESOLUTION: 2x 1280x1024

ADDITIONAL COMMENTS: Willing to spend a little extra to have something slightly future proof that I can move to my next machine...