Shadow is spot on. they'll both be fine, but the CPU will be holding you back a bit. A little bit of OCing will help. Out of those 2 cards, the 4670 is probably where I would go- no external power connector needed and its really powerful for the price.
thanks for all ur suggestion.. well my main motive was to use my monitor properly and some gamin with moderate settings.. i think of upgrading the psu to 500W.. and upon checking they told that there are two types like the basic psu of 500W and another one which they mentioned as server or somethin.. please advise
XFX 9600GT PV-T96G-YNF3 this is what i bought.. I got small cable with it having 2 pins on one side and i don't know where to connect it to the PSU.. I could connect one side of the cable to the graphics card to a slot at the socket near the fan's power
You should have got the HD4670 like everyone else said. It DOES_NOT_NEED_AN_EXTERNAL_CONNECTOR. Now you're chancing it with your PSU of blowing up your computer, because I really wouldn't trust a 400W no-brand PSU with a 75+Watt GPU.
thanks buddy.. testing the card now.. will keep posted... thank you everyone for helping me out here... the card as of now is cool.. is there any software by which we can measure the temperature of the card?