If you want to buy “the best” power supply for your small form factor (SFF) computer based on the TFX12V standard, Seasonic SS-300TFX is the product you should buy.

Of course there are cheaper units available on the market, but they don’t offer the efficiency level (between 83.4% and 86.6% in our tests), the ultra-tight voltage regulation (voltages very close to their nominal voltages) and the practically  non-existent noise and ripple levels (the lowest we’ve seen from all power supplies we’ve tested to date) found on SS-300TFX.