QUOTE (Chris!! @ Jun 21 2009, 12:00 PM)

ended up with the 8400, gtx275,gigabyte ep45ud3p, 500gb hd, 4gb ram 2 channels
question - on the motherboard, for the ram theres 2 yellow and 2 red slots, do i put 1 in each colour or one in each red? or yellow? its get a red and a yellow, then a space then another red and a yellow
Back in the day, yes you needed to do this. Depending on whether the sticks are matched and dual channel or not, just chuck them in 1st, space, 3rd, space.
If it beeps like a mofo, then take the 3rd out and place it in 2nd.
And also, in regards to the whole dual core gaming thing: Games aren't yet designed to utilise the full potential of multi core processors, as far as I know, they still only utilise the 1st core and completely ignore any others (apart from Crysis maybe). You're probably better off sticking with a medium to high model dual core and upgrading everything again later down the track when the aforementioned does actually happen.
It also depends on what sort of other things you'll be doing on the PC, if you're going to be compiling complex C++ programs, running dual screens, holding a 20GB database, a file server and editing movies all at the same time, go for the quad.