I have a 650 watt powersupply, I dont remember the exact brand.

I I want to know if it will will good enough for my system after a series of upgrades.

Ill have two EVGA 8800 GT's in sli with a Intel Q6600 EVGA on a nForce 680i A1.

I think it might be enough but im not sure.

Power supply calculator link in my sig- use the free version.
you input ALL your hardware... even USB stuff (usb draws power)
It will give a number-- I usually add at least 50 W headroom-- more if you plan more upgrades

it said 327...

that cant be right can it?

2 8800GT's in SLI?
Q6600?

Actually you'd be surprised, I have 3 HDs, 2 Disc drives, 1 Floppy Drive, 2 fans, and some other stuff (filled all my PCI slots and drive bays) and it says I only need 277watts (I've got a 500w psu though)

yeah, but that's at idle...your peaks would be a lot more
plus you add 100 watts for expansion/heavy loads
427-- I'd go 500 at least-- if you want to plan to reuse the PSU later-- which with a good-quality maker is more than possible... Go 600 or 700.

Well i've got a 650 watt.

Thanks fellas!
Im much more confident in my psu now!

Cheers! :]