I'm thinking in substitute my current Core 2 Duo E6400 PC with a Mini-ITX system, described below:
1 x ECS H55-I mini-itx motherboard
1 x Intel Core i3 540
1 x HD 1TB, 7200RPM
2 x 2GB DDR3 memory modules (total 4GB)
No video boards.
The extreme power suply calculator (here: http://extreme.outervision.com/PSUEngine) tells me my minimum PSU must be 142Watt, using the 8USB devices. I just don't know if this calculator can be trusted, but it is the first one I found on google.
I do have a mini-itx case, with a real 160Watt power supply, and I got another mini-itx machine with a 120Watt pico-psu unit.
There are 3 questions I'd like to ask you guys:
1) Assuming this 160Watt PSU can be trusted, would my system be in jeopardy with so little margin of use ? (there is only 18Watt "left" to use).
2) Would I be able to add a videocard later (say a radeon HD 5450) on this system, regarding power supply requirements ?
3) Is there any Core i3 or i5 that can be used with a 120Watt Pico-psu unit ?