Is a Corsair HX 620W ATX2.2 Enought for an i7 rig?

[audiolab]

This is the spec I am going to order tomorrow;

In 2007 I bought a "Corsair HX 620W ATX2.2 Modular SLI Compliant PSU (CMPSU-620HXUK - from OCUK)", which has now been discontinued but it is working fine in my current Core 2 Duo system. My question is should this power supply cope with the above i7 rig? or am I better going for a 750/850w one?

I have used a few of the online calculators and they seem to indicate it has more than enough juice. While I don;t want to skimp when spending this much I also don't want to spend money if it is not needed.

Any thoughts would be appreciated.

 

[audiolab]

Thanks, I thought as much. If it was a budget brand supply then I would probably change it but I think I will see how it goes. If there is any instability I will swap it out.