Take a look at the entire review. They tested quite a few psu's. Antec Earthwatts EA500 and Corsair HX520 were rated Number 1 and 2. The Sumvision was at the bottom of the list. It definitely cannot deliver the advertised specifications.
8800GT had recommended 22Amps on the +12volt rail, 19amps might do it but be close. OP the most important thing for modern systems is Amps on the +12 volt rail it is the one that drives your CPU, GPU and storage. For example I have somewhere a 680watt ATX psu with 16amps on the +12 volt rail, looking at the total watts you would think it was fine but it could not run a vanilla 6800 stable.
The 1024MB version of the 8800GT only uses 76 watts and 6.5 amps at full load. The 512MB version of the 8800GT uses 112 watts and 9.5 amps at full load. The source of the information is a recent Toms Hardware article about video card power requirements. I checked the atomic web site also. That site shows even lower wattage.
The 4670 uses about 57 watts and 4.7 amps at full load. The atomic web site shows a slightly higher 70 watts.
The rest of the components in the pc won't use more than about 200 watts. The Bestec should be able to handle the system.