Could you be more specific on the CPU & RAM, is it an intel pentium D or is it a Core 2 Duo? what type of RAM is it, PC6400?
Is this PC a custom-built job, or is it a pre-built system from the likes of HP or Dell? If so, list the model number.
the 400-watt power supply, does it have a 6-pin PCI-E connector?
Also, what is the current video card that you're using?
Please list the games you're referring to as "latest games"