Upgrade options - i7 Extreme 975

[aeg]

I have the following spec's system and looking for some advice on preferable upgrade that would make noticeable performance change ,

1. Asus P6TD DELUXE motherboard.
2. Intel core i7 Extreme 975 (3.33). (The Delta DBX-A Cooler)
3. 6GB DDR3 Corsair RAM.
4. GeForce GTX275 graphics card .
5. CoolerMaster HAF 922 Case.
6. PSU Corsair HX1000.

thanks and regards,

 

[Wolfshadw]

NVidia Geforce GTX690.

-Wolf sends

 

[FinneousPJ]

Yeah a new GPU.