Sapphire 9800XT Problems

[Langer]

I have had this card for around 2 - 3 years and had no problems untill recently. From the moment the computer starts up the screen has blocks of colour all over it, which makes viewing anything almost impossible.

I have updated the drivers but have had no luck.

I have no idea what this is or wheather the card is still under warranty? Any help would be much appreciated.

 

[Langer]

Ok if I need a new card that means a new rig as old motherboard has AGP x8.

Old system is:-

P4 2.8 clocked at 3.5
OZC 1 gig PC 4400
Sapphire 9800XT
120 gig maxtor hardrive
creative audigy platinum

If I upgrade to one of the new Intel Core 2 DUO E6600 "LGA775 Conroe" 2.40GHz, with say the HIS ATI Radeon X1900 XT ICEQ 3 SILENT Heatpipe 512MB will there be much of a difference in performance compared to my old system?

Is the extra £70 for the 650mhz His over the 625mhz worth it?
What can the Intel Core 2 DUO E6600 be clocked to on air?
Ill need new ram to overclock the new processor any you can recommend?

Any help appreciated