Anyways considering you do not want to upgrade your PSU, then I’m guessing the ATI HD4670 should be perfect. Try getting the 512mb version (although I highly doubt you’ll find that).
Since you’ve got an old Intel board, I’m assuming your Intel Core 2 Duo must be around 1.8~2.4Ghz. So, using that processor + HD4670 should give you Low-Medium graphics @ 1440*900.
You don’t have to change the PSU if you are taking the HD4670 512mb/HD4670 1gb. Anything more than this would require a better PSU …
You can get its elder brother the HD5670 which should easily run most of the latest games at Medium-High graphics but then you’d have to shell out atleast 1.5k more and get a better PSU (FSP Saga II 350W).
Get a HD5670 512MB DDR5 ~ 4.7k and a FSP SagaII 400w ~ 1.9k.
FSP is a major PSU OEM. The PSU has a PCI-E power connector, 3 SATA power connectors and 3 4-pin power connectors IINM.
Don’t save money, especially when it comes to PSU.
At 1440*900 the 5670 will be able to handle most of the game with all settings at medium easily, in dx11.
It’s also got a better video decoder than the 4670, and it’s more power efficient, and a lot more powerful, it’s close to the 9800gt in performance. You’ll get close to double the performance of the 4670 for a 1000 bucks more.
I’ve read somewhere that the HD 5670 does not require an additional power source and draws power directly from the motherboard…do I need to connect the card to the PSU?
As you said, it doesn’t require any additional power source and draws power directly from the motherboard. So, you don’t have to connect the card to the PSU.
The card has been M.I.A. at shops for almost a year now completely phased out by the GTS 250 , the HD 5670 with the FSP Saga II power supply is the OP’s best bet in my view
http://www.anandtech.com/bench/Product/173?vs=178 ~ the HD 5750 is 15% above the 5670 in performance ( RAW ) + the 8800 GT is the basis of all the 9800 GT series cards so this bench provides a rough match up
The 512MB would suffice as there as hardly 1-2% difference between the 512MB and 1GB version. But the 512MB version seems hard to find (Should be priced at ~4.7k)