It was a Alpine 700W, this was the same one as my old one and again about 1 hour ago the Power Supply blew up.
I've never seen the Alpine series (not sure it's available in the States), but I saw it was 15-22 GBP ($23-34 USD). That price tells me it's a very low quality PSU and it isn't surprising that it failed so quickly. Unfortunately, PSUs are one area where it's crucial to get quality. The Corsair you purchased is definitely more than adequate but is a much better brand so you should be good.
Hope this helps.