See here for Adobe Photoshop minimum requirements:
In fact a higher spec is better, with as much RAM as you can afford. I only have 4 gig RAM - would like a bit more for when a number of photos are open. Also I prefer 2 hard discs, one can be designated as a scratch disc (can be used for other things too). If you are lucky hssutton will contribute to the thread as a Photoshop guru!.