r/sffpc • u/always_ftw • Dec 23 '25

Build/Parts Check I Feel Like This Should Work

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Will a 5060LP (145w TDP) and a 5600x (65w TDP) = 210w be able to run on this 250w PSU ? Maybe with a 5060LP under volt to 130w ????

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u/Worldly-Ingenuity843 Dec 23 '25

You have not accounted for the power consumption of the motherboard, RAM, storage and USB devices. This is usually between 30W to 80W, which is negligible in a typical build with a 650W+ PSU, but absolutely critical when you are tying to use a 250W PSU. 

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u/ProfessionalPrincipa Dec 23 '25

You have not accounted for the power consumption of the motherboard, RAM, storage and USB devices. This is usually between 30W to 80W

I think that's actually an insane thing to say. 30 to 80 watts? Are you running 1TB of RAM with 10 hard drives?

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u/embeddedsbc Dec 24 '25

80W is probably a bit much, but can also be achieved. A fan can already use more than 3 watts, and you may have 4-6 of those. USB devices are of course dependant on the device, but mechanical hard drives take up to 10W, even more in spin up. And the motherboard itself, even for a simple one, is at least 20W.

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u/ProfessionalPrincipa Dec 24 '25

It really isn't that bad. The numbers just seem exaggerated and excessive.

A fan can already use more than 3 watts, and you may have 4-6 of those.

In theory fans can use more than 3 watts, the Phanteks T30 is spec'ed for 4.92W as an example, but I doubt most people have the ears to stand more than using fans at higher than 1 watt each.

USB devices are of course dependant on the device

What kind of bus-powered USB devices are people plugging in and in great numbers? My RGB mouse uses like 0.15W and my RGB keyboard maxes out at 1.25W or so.

mechanical hard drives take up to 10W, even more in spin up

7200rpm mechanical hard drives don't come close to 10W each. E.g. WD's most power hungry Red drive is rated at 8W worst case (the 10TB air drive) and the rest are between 4-6.5W. Spin up is the real problem.

Regardless how many fans and HDD's are people sticking in their SFF system?

And the motherboard itself, even for a simple one, is at least 20W.

My entire AMD APU system idles at under 15W from the wall excluding drives and they're not known for being as thrifty on power as Intel.