Confused between two graphic cards and my pc spec compatibility

hi guys, I would like to buy either the Sapphire vapor x radeon HD 7770 GHz 1Gb 128bit GDDR5 Overclocked edition or the Gigabyte NVIDIA GeForce GTX 650 - GDDR5-2GB.

I have a Processor Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz, 2668 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. P01-A4, 1/15/2010
SMBIOS Version 2.6
Hardware Abstraction Layer Version = "6.1.7600.16385"
Installed Physical Memory (RAM) 4.00 GB

Power supply

AC INPUT- 165-250V~,3.15A, 50Hz
DC OUTPU: 250W (+3.3V & +5V = 110 W MAX)

Which should I buy?
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More about confused graphic cards spec compatibility
  1. Neither. You'll need a new power supply before you get either of them.
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