seasonics are good supplies, but we arent there yet
I assume you have an optical drive of some sort, CDRW or DVDRW right?
the figures for the 6800GT
http://www.xbitlabs.com/misc/picture/?src=/images/video/ati-vs-nv-power/6800gt_table-b.gif&1=1
most of the rest would be on the
http://www.abit-usa.com/produc...egories=1&model=80]mobo[/url] and not seperate equipment, I gave you 3 case fans and a big fan on the CPU (high draw not physical size)
http://takaman.jp/D/?M=PcQORNSCkG5DrYcZAZbOP&english
or a theoretical maximum of
+3.3V @ 2.5A
+5V @ 9.3A
+12V @ 18.4A
286 Watts
in this case we can skip the spinup draw baseline and proceed diectly to a realworld worse case senerio
+3.3V @ 2.5A
+5V @ 9.3A
+12V @ 16.4A
about 250 watts
with all the fans, the HDD at 25% draw
the CPU, AGP, mobo and a single optical spinning up at 100%
since most supplies are rated at an artificailly low temperature you cant replicate
they need to be derated
so Id recommend at least a 400 watt supply with a minimum of 26 amps on the +12V rail
but in truth it would be far better for you to get a supply that meets the latest spec ATX12V v2.0
which will have a 24 pin main power connector (and an adapter if your board is 20 pin which it is) they generally have 30A on the combined +12V rails
an entry level supply would be the
http://www.newegg.com/app/View...=17-104-934&depa=1]Fortron Blue Storm[/url]
there are several Enermax ATX12V v2.0- supplies, there is also the Antec Neopower
total wattage is from 470- to 500 watts and would provide you with some expansion room and a safety margin