Upgrading...

Hey guys, This is my pre built system:
http://www.newegg.ca/Product/Produ [...] 6883109038

Its a COMPAQ Presario CQ5210F

here is some info:

CPU - AMD Athlon II X2 215

MOBO - PEGATRON CORPORATION NARRA5 5.00

Graphics - NVIDIA GeForce 6150 SE Integrated Graphics

Im pretty sure it's got a 250W power supply.

I want to add in a Radeon HD 6670 so i can play better games at higher settings.

Here are some benchmarks of the card:
http://www.anandtech.com/bench/Product/613

is a 250W psu enough? will i experience bottlenecks?

OH i almost forgot, I'll me playing games at 1336x768 (My max resolution) on my Compaq VGA monitor. I don't mind playing at 1024x768 either.

How much fps can i expect to get for games like Diablo 3, Black light retribution, etc?

Thanks.