Graphics upgrade on a desktop. Need some help :)

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It's a great feeling...

Received the PSU yesterday (Installed it, and everything was working fine)
Received the GPU today! yaaay
I'm going to install it now!

the graphic card is sooo beautiful!!

installed the two Fans, the PSU and the graphic card
Updated the latest GPU driver from nVidia.
But Windows Update suggest me an optional driver for the GPU... ?? I didn't want to install it... what do you think? Because I installed the latest driver from nVidia...

I will put the RAM, and that's it!

I have to get an additional 2GB RAM, but only DDR2 is appropriate.

And how about an nVidia Geforce GT440.... that's the most affordable 1GB DDR5 I've found

But doing that... is it going to strengthen my game playing shows a lot? or just a little bit ?

I have to get an additional 2GB RAM, but only DDR2 is appropriate.

And how about an nVidia Geforce GT440.... that's the most affordable 1GB DDR5 I've found

But doing that... is it going to strengthen my game playing shows a lot? or just a little bit ?

If you read in my old replies you'll see that I was going to get the GT440.But the GTX550Ti is way more powerful but for only 20$ more!!! It's worth the 20$ more!!!And it depends of what graphics you do already have...



Talking about the GTX550Ti... I just borrowed Battlefield 3, and COD MW3 from my friend.... everything on EXTREME/HIGH quality!!! So smooth!!! 
I had COD Black Ops, and it was OK, I couldn't play with it with the highest quality (with the old specs)... but now I feel like having a Ferrari of desktops    (well...  I can't have a real Ferrari... so I can dream with my computer  )
Thank's all for your help! Especially Raptor !