There are websites where you can look and compare videocard speed averages. (See Related links). According to VideoCardBanchmark the 7770 got more than twice the performance marks.
Will a xfx nvidia geforce 9600gt xxx edition graphics card work on 300w power supply
no
No, you must buy an NVIDIA GeForce 8400gs card.
Integrated graphics card.
it will never be GeForce 8400 is improved and and is better than GeForce 6800 in every way
8500gt by far
Call of Duty: Modern Warfare 2 will not run on a nVidia GeForce 6200 GT graphics card. You will need a 256 MB nVidia GeForce 6600GT or better graphics card.
Sorry the last remnant will not support Nvidia geforce 5500 graphics card is is to old of a graphics card your going to have to buy a Nvidia geforce 8600gt or a 8800gt i have already went threw the same thing.
Nvidia GEforce
amd radeon is the best compare to nvidia
A Nvidia GeForce 670M
A superclocked nvidia geforce gtx 680 or a nvidia geforce 680 ftw also I realise that the ftw has double graphics memory but does the superclocked card beat it? The one that is the double graphics would be the best one cause it is double graphics and superclocked. So your best bet would be to go with the best one!