@rds well like i said, its an i7 920, used parts i had lying around etc...
I'm assuming since you said laptop, you're running high capacity drives off USB. I have 15 drives in the 3-4TB range (usually refurb'd datacenter HGST), so i'm guessing 120-150w from drives and 90w from processor/mobo. 200w seems very "eco" to me... i'm running the whole rig for the power consumption of 1 current generation crypto mining GPU.
J