What is the power like to your house? Like all electricals, PSUs have very slim operating limits in terms of voltage(230V for the UK versions, 220V/230V for all other EU countries, 110V for the USA etc). Is it possible that the power spiked or sagged going into the PSU?
It's well known that brownouts or spikes in power can cause PSUs to go bang, that's why you'll never find a server with less than 2 seperate independent PSUs, and probably at least one power conditioner and/or UPS
Anyhoo, half of the componentry in my PC is corsair (Case, cooler, memory, fans) and they've all been rock solid. I've used a lot of CX and RM PSUs recently in builds and not had a DOA or a quick fail unit. Had loads of Corsair units going back as early as 2009/2010 and they've always stayed strong... but I have a power conditioner :P