Smallest POWERFUL PSU for Thin Mini-ITX DIY Case

Brian McG

Distinguished
Jan 23, 2015
48
0
18,540
I am in the process of designing a DIY case for a portable Workstation/Server that will fit in a briefcase. So far I've got it down to 9.4 litres and have identified the limiting factor is the size of the PSU required.

The best solution so far is a Corsair SFX 450. But it is 63.5mm thick. The other dimensions 120 x 100 are fine, but I'd like to make the case thinner. I've looked at 1U PSUs but the smallest I've found is 180 x 81.5 x 40.5. Unfortunately the 180 makes the case too large to fit. I'm also concerned that the 40mm fans in a 1U PSU will be too noisy. Hence the preference for a Corsair SFX as it has a 90mm fan.

Does anyone have any suggestions to make?

The spec I have in mind is pretty high-end:

  • CPU - Intel i7 7700K,
    Water Cooler – ID-Cooling Frostflow 120L,
    Motherboard - Asus ROG Strix Z270I Gaming Mini-ITX ,
    GPU – Gigabyte GeForce GTX1070 Mini-ITX,
    RAM – 32GB DDR4 4266MHz,
    M.2 SSDs – 1 x 500GB Samsung 960 Pro (leaving one slot spare),
    Hard Drives – 4 Hot-Swappable 1TB Seagate Barracuda Hard Drives (3 in RAID 5 Array, 1 for backup) ,
    PSU – Corsair 450W SFX SF450.
So far this all fits into a case 410 x 317 x 72.5mm, including a tinted tempered glass lid.
 
Solution
I FINALLY found one for myself it is the Seasonic SSP-300SUG 300W 1U PSU which is only 81.5 x 150 X 40.5mm. Importantly it has a 24 pin connector in that length that direct the cables upwards, meaning that it does not take up more the 150mm.

Using this means my case would be only 415 x 314 x 61mm, which still fits my briefcase - JUST! BUT I was concerned that at only 300W it would not be powerful enough for my build. So I used the OuterVision® Power Supply Calculator and it calculates my requirements as 400W. So unless someone can suggest something else, it looks like I'm back to square one.

Brian McG

Distinguished
Jan 23, 2015
48
0
18,540
I FINALLY found one for myself it is the Seasonic SSP-300SUG 300W 1U PSU which is only 81.5 x 150 X 40.5mm. Importantly it has a 24 pin connector in that length that direct the cables upwards, meaning that it does not take up more the 150mm.

Using this means my case would be only 415 x 314 x 61mm, which still fits my briefcase - JUST! BUT I was concerned that at only 300W it would not be powerful enough for my build. So I used the OuterVision® Power Supply Calculator and it calculates my requirements as 400W. So unless someone can suggest something else, it looks like I'm back to square one.
 
Solution