Upgrading my Alienware x51

I am kinda new to the software on computers but have researched some parts to upgrade my x51

MSI N670GTX-PM2D2GD5/OC GeForce GTX 670 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card

Intel Core i7-3820 Sandy Bridge-E 3.6GHz (3.8GHz Turbo Boost) LGA 2011 130W Quad-Core Desktop Processor BX80619i73820

G.SKILL Ares Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-1333C9D-8GAO

I know I'm going to need a better power supply i just don't know what kind. Will these fit or do i need to buy other things too? Also if you suggest any better parts please tell me
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More about upgrading alienware x51
  1. Dont Alienware's use some wierd, external PSU?
  2. rex4235 said:
    Dont Alienware's use some wierd, external PSU?

    Should I just build a new PC instead?
  3. Wait a minute, isn't an X51 a laptop or is it a desktop?
  4. Its like a slim desktop
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