"The Athena Power AP-MFATX35 measures only 3.2" x 1.7" x 6" (80 x 40 x 150 mm) (W x H x D), being targeted to small form factor (SFF) computers with Mini-ITX motherboards. Rated at 350 W, is has the 80 Plus Bronze certification, which promises at least 82% efficiency. Let's see if this product is a good option."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips