Am building a HTPC and the case comes with a 250W 1U PSU, there will be no dedicated graphics card as there is no room. The 250W PSU will need to power motherboard, CPU, RAM, Laptop DVDRW and a laptop HDD. With just these components can I use any CPU/board for sale or does it need to be under a certain TDP? Full PSU specs are:
1 The continuous max. DC output power shall not exceed 250W.And +5V、+3.3V total output power must not exceed 125W.
2 A 0.1uF ceramic disk capacitor & 10uF electrolytic (low ESR) capacitor should be put across the output terminals during ripple & noise measure. The oscillo-scope bandwidth set at 20MHz with co-axial probe.
3 Regulation load must within 30% to 70% of maximum load
4 AMBIENT TEMPERATURE 25℃.
3.1 OVER LOAD PROTECTION
3.1.1 120-160% of maximum power.
3.2 SHORT CIRCUIT PROTECTION
All output to ground.
NOTE : After protection active all output will shut down .After shut down the power supply shall return to normal operation.only after the fault has been removed and the remote signal reset for a minimum 1 second (or the AC remove for 10 second).
4.0 TIMING SEQUENCE
TURN ON TIME
P.G Delay time
Hold up time.
5.0 TEMPERATURE CHARACTORISTICS
5.1 OPERATION AMBIENT :
+10 to +40℃。
It is the discrete graphics card that mostly determines the psu required. Since you have only integrated graphics, you can probably run on as little as 80w if you have a 32nm cpu.
There may be more to it than that. Psu quality counts, so it might be wise to see if you can find some reviews of the specific unit.
In general, included psu's from case vendors are not regarded as high on quality. Antec seems to be the exception.