Review of 7300GS click here
"What does it mean by this?
512MB DDR2 nVIDIA GeForce 7300GS - TV out- DVI - PCI X (256Mb SMA)"
I think what that means is the pc has 512Mb DDR2 RAM and the graphics card can use 256Mb.The thing to be carefull about is the 7300 uses shared memory...ie it has very little onboard memory and instead uses the system RAM.....Nvidia claims this is a way of getting a better specification of graphics card for the money.
If the graphics is capable of using up to 256MB that will only leave 256MB for windows and any games you run.
I believe the card is good for a budget card but whilst it supports all the latest features....like HDR lighting, it is really not powerfull enough to run them.
And you will need to double the amount of RAM to 1GB otherwise you will get performance slowdowns if gaming.