Cheap graphics card for intel core 2 duo

[arktose]

I'll give you as many stats on my pc as I know.

winxp
Intel Core 2 duo @2.13 ghz
nvidia geforce 7650 gs
3gbs ram

i would just like to upgrade the graphics card. I'm trying to run left 4 dead 2, and while it says my computer can run it, even with optimized settings, after 20-30 minutes of play, there is graphic stutter for almost 20 seconds every 10'ish minutes.

originally, I thought sapphire radeon 5450 hd would be fine, but it gets mixed reviews (but it's sooo cheap)

any help would be super appreciated!

 

[arktose]

would something like this work? http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5450-overview/pages/hd-5450-overview.aspx

 

[Koenigsegg]

We have to know your PSU and your motherboard

 

[Sunius]

Yes, we definitely need to know your motherboard and power supply unit.