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this is your spec from other posts, which gives 100W, so I presume you have added a graphics card.as you say your psu calc said 300 to 350 WWith your current calc I would take the sfx 450W. Calculated power 350W plus 100W for overheads/relaxation over time. Platinum for better quality components. Only £10 in it between the two power supplies. And the SFX protects you if you want to stay small form factor.You will probably need an SFX adaptor plate for the case, looks like it was designed for ATX power supplies
this is your spec from other posts, which gives 100W, so I presume you have added a graphics card.
as you say your psu calc said 300 to 350 W
With your current calc I would take the sfx 450W. Calculated power 350W plus 100W for overheads/relaxation over time. Platinum for better quality components. Only £10 in it between the two power supplies. And the SFX protects you if you want to stay small form factor.
You will probably need an SFX adaptor plate for the case, looks like it was designed for ATX power supplies
