INTEC275 PC: Power Supply Options

Moving on to the power supply (PSU) considerations.

Again, the issue is the space space space. Assuming that I'll use a Mini-ITX motherboard (170 x 170 mm), PSU must be smaller than 100 x 79 x 308 mm... Most certainly a full-size ATX PSU is out.

There are basically 2 choices: Flex-ATX PSU or DC-to-DC converter with an external brick.

Flex-ATX PSUs (best known to be on Shuttle's XPCs) comes in the basic dimension of 150 x 81.5 x 40.3 mm (base model; there are longer models to accommodate higher output power). It cannot come in better dimension than this!

We don't need a lot of power, (Someone over at AVS Forum throwing 50 W as the power consumption for a Zacate-based HTPC.) But we want silence and 2 SATA power connections. And, I found a perfect unit:

FSP120-50GNF 120W Single FANLESS FLEX ATX Server Power Supply
newegg


Now, there are 2 concerns. First, there seems to be two versions of this PSU: one with 8 4-pin Molex connectors and another with 2 SATA power connectors. I want the latter, but it's not certain which one a store carries...

Secondly, it comes with 20-pin motherboard connector (not more modern 24-pin version) and has no 4-pin ATX 12V connector. Most motherboards released so far requires both (Asrock board seems to be the only exception). Now, there are adapters for both of these connections, but it would be the best if I don't need to invest in them.

For DC-to-DC converter route, the most prevalent option seems to be the PicoPSUs from Mini-Box.com.

For an ordinary setup, PicoPSU is a nice compact option, but the height clearance might be a problem for INTEC275 PC as it has a good chance to be located underneath the optical drive. Other options includes the Molex 80W unit.

I'm leaning towards Flex-ATX PSU route, but motherboard power requirement must be reviewed carefully.