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Upgrading My GFX Card And PSU Help

Hey There,

I want to upgrade my graphic card of alienware x51 from nvidia gtx660 to 

MSI Nvidia GTX 770 Gaming 2GB DDR5 TF Fan PCI-E Graphics Card

I am confused about the power supply problems related to graphic card.The minimum power supply requirement of nvidia gtx 770 is 230 watts

Here are the configurations:-

Processor:-Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz

Memory:-8 GB

Power Supply:-Alienware 240 Volt Power Supply

Current Graphic Card:-NVIDIA GEFORCE GTX 660 (BSOD'S ALOT)

Please help me as soon as possible.

Thank You


GTX 770 GPU Engine Specs:
  1536CUDA Cores
  1046Base Clock (MHz)
  1085Boost Clock (MHz)
  134Texture Fill Rate (billion/sec)
GTX 770 Memory Specs:
  7.0 GbpsMemory Speed
  2048 MBStandard Memory Config
  GDDR5Memory Interface
  256-bitMemory Interface Width
  224.3Memory Bandwidth (GB/sec)
GTX 770 Support:
  GPU Boost 2.0, PhysX, TXAA, SHIELD-Ready, NVIDIA G-SYNC-readyImportant Technologies
  3D Vision, CUDA, DirectX 11, Adaptive VSync, FXAA,
  3D Vision Surround, SLI-ready
Other Supported Technologies
  PCI Express 3.0Bus Support
  YesCertified for Windows 7, Windows 8, Windows Vista, or Windows XP
  Yes3D Vision Ready
  Yes3D Gaming
  YesBlu Ray 3D
  Yes3D Vision Live (Photos and Videos)
  YesNVIDIA PhysX™ Technology
  11Microsoft DirectX 11.2 API
Display Support:
  4096x2160Maximum Digital Resolution1
  2048x1536Maximum VGA Resolution
  One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPortStandard Display Connectors
  4 displaysMulti Monitor
  InternalAudio Input for HDMI
GTX 770 Graphics Card Dimensions:
  4.376 inchesHeight
  10.5 inchesLength
Thermal and Power Specs:
  98 CMaximum GPU Temperature (in C)
  230 WGraphics Card Power (W)
  600 WMinimum Recommended System Power (W)
  One 8-pin and one 6-pin
and this is the edition i found because it is cheap, 
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