Geforce GTS 250 1GB vs Geforce GTX 460 1GB vs Geforce GTX 460 768MB

[asiff6000fx]

hi all i am hoping to get a new graphics card and want to know witch one is the best in performance Geforce GTS 250 1GB or Geforce GTX 460 1GB or Geforce GTX 460 768MB these are the configuration for the card please give your feedback


GeForce GTS 250
Performance
738 MHz GPU
128 Processing Cores
400 MHz RAMDAC

Memory
1024 MB, 256 bit
2200 MHz (effective)
70.4 GB/s Memory Bandwidth



GeForce GTX 460
Performance
763 MHz GPU
336 CUDA Cores
400 MHz RAMDAC

Memory
1024 MB, 256 bit GDDR5
3800 MHz (effective)
121.6 GB/s Memory Bandwidth

GeForce GTX 460
Performance
720 MHz GPU
336 CUDA Cores
400 MHz RAMDAC

Memory
768 MB, 192 bit GDDR5
3600 MHz (effective)
86.4 GB/s Memory Bandwidth

i need your help to choose the best card and please let me know will my current PSU can give the correct power to the card i have a Cooler master eXtreme Power Plus 550W +12v1 16A ,+12v2 16A for the moment it will be great if u can help me out to choose one

This is the system i have

Processor - Intel® Core™2 Quad 2.4GHz
Memory - 4.0 GB RAM
HDD - 160GB
Cooler master eXtreme Power Plus 550W +12v1 16A ,+12v2 16A

Note : i am hoping to get only one single card

Thanks

 

[plznote]

The GTX460 1GB is the best