Dell XPS 420 Graphics Card upgrade?

Here are some specs:

Intel Core 2 Duo E8300 @ 2.83GHz

Windows 7 64 bit

3.00 GB Dual-Channel DDR2 @ 398MHz

Dell Inc. 0TP406

466GB Seagate ST3500620AS

I got this pc in 2008 and I have had it sitting in the corner now for about 6 months, A few friends have really good pc's and are saying just how better games look on the pc that on an Xbox 360 or a PS3 but when I try and play games like mass effect and Need for speed on my pc I get much lag, pixels missing,a strange black strands running across the screen. SO I was thinking about upgrading so I can hopefully play games without these problems, so, because Im so clever I have worked out that to accomplish this, I need to get new ram and a new GPU, (also possibly a new PSU). I am thinking of getting this ram:

It looks good and has good reviews. For the graphics card, this is where you come in, I have next to no knowledge about GPU's.
I have NO MORE than £100 to spend on the GPU and it HAS TO BE FROM Amazon UK. If you could send me links to the best GPU you can find on Amazon UK. Your help is greatly appreciated.
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More about dell xps 420 graphics card upgrade
  1. about the ram, what you have is not just 400MHz ram. Because it is DDR = duel data rate = X2 = 800 MHz ram. for you to buy the ram you have listed you would be down grading your ram speed. Most times when you look at ram it lists full speed the ram you have listed is 667MHz max not 1333Mhz.

    you will need a new PSU pick out a 550W.
  2. £100 for all upgrades or only for video card?
    Better video card - more money due to the upgrade of power supply, it is like snow ball.
    So, how much you can spend total on your XPS upgrade?
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