|1. why are you buying from TigerD?|
2. why would you pay so much for a crappy video card?
3. will it work? - yes.
4. will it work well? - no.
5. I sure hope you didn't pay $180 + shipping for that Dell? If you did, you paid way too much.
Here's your system specs:
Get yourself a Radeon HD 4670 with either 512MB or 1GB GDDR3 memory. Choose the card that runs the memory at the fastest speed. 1GB cards are *usually* slower than 512MB cards.
And chuck the 512MB DDR2-400 & replace it with at least 2GB DDR2-800.