Good point. I'll try and listen to them both.
I would recommed to use the OCCT PSU test, to assess the load noise level, in order to log some voltages data (even if they're not that reliable), with the PSUs mounted in the FD case, and all the panels closed, in order to simulate a sort of "real world scenario".
Pairing a power meter (like a Kill-A-Watt) would be a very nice and useful tool, if you can have one.
I was thinking of getting a seasonic with passive cooling or low noise, depending on price and efficiency. But if there are better alternatives I'd like to hear them.
Well, please take note that's my own very personal opinion.
I don't like that much current fanned XM3/XP3 (X-series/Platinum) Seasonics, and F3 (G-series and derivatives) are worse, noise-wise.
Their fanless units are better, but QC at Seasonic doesn't seem at their best, currently: I was told from a reputable source they experienced RMA for coil-whine with a ratio in excess of 10% (latest example on SPCR
), so whether it might be a good choice, you have to carefully pick your seller (they have to be known to make no objections to any customer request, as at worst you might be forced to RMA a PSU even more than two times).
About alternatives, I think there's plenty of options, but you should give us some links to what is available in Denmark nowadays, even because local pricing may vary a lot.
Where to find info on the hard drives? Is there a general ruled of thumb, or do I need to look at the specs for each model?
I have Seagates, Samsungs and WDs, all above 1-4TBs.
It would be better to pick technical docs from manufacturers.
Probably the most important data to correctly size the PSU is their maximum current draw at spin up. As a rule of thumb you could consider about 2A of current draw from the 12V rails for each 12V 5400rpm drive (like a WD Red/Green), but there are drives which draw current even from the 5V rail.
Say the drives uses 7W each, making it 70W in worst case and the mobo 20W and the new CPU 85W and rounded up, that is 200w, so a 300w should do?
Set aside the spin up issue (which controller do you use?), IMVHO you shouldn't draw much more than around 130-150W DC under a severe load (not benchmark/stress testing), and on average I'd expect noticeably less. I assume your drives are 5400rpm desktop ones.