Graphic card advice on old system

[nfcs2008]

Hey guys i currently want a new graphic card to play Battlefield 3 and my current graphic card system do not support the game so I would like some advice on which card should I get with budget around 50-80 pound as I trying to get it to work at minimum or medium setting.


My system current setting

Intel(R) Core(TM)2 Duo CPU E7400 @2.80 GHz
6GB RAM
System Model : Inspiron 545s
Window 7 Professional 64 bit
Graphic card: ATI Radeon HD 4300/4500 series

Many thanks in advance

 

[nfcs2008]

yeah my PSU is in 300w for my 545s it is a pretty small case would it help if i upgrade it to 400 w?

 

[nfcs2008]

I think i should wait till i have the money to get build one myself, it is quite costly to upgrade this dell machine , thanks for your advice d_brennen