First, to satisfy Takumi:
:twisted::twisted::twisted: FLAME FLAME FLAME FLAME FLAME FLAME FLAME :twisted::twisted::twisted:
Glad I got that out of my system. :awe:
Well, that's a fair point. But it's only one of the potential reasons for buying the X-650. I agree that you need to draw the line somewhere in terms of what you actually need and what you benefit from. That applies to every PC component, not just power supplies. There's always the same law of diminishing returns when you pay for higher quality or performance. That said, I don't think you'd make a mistake either way - the X650 and the Core 650 are both great buys IMO. When I said "I wouldn't pass it", I didn't mean I'd fault the OP for going with XFX instead.
I do agree that 5 years in the computing world is a long time and a lot of things can change. What was fast yesterday will be slow tomorrow. But PSUs are just part of the backbone that powers all those components that actually undergo that rapid improvement over time. While it is certain that components will be a lot faster and will require new data transfer specifications, we don't know that they will require new power specifications. In fact, I think it's unlikely, though possible, that components will use any more power 5 years from now. They may even use a lot less power. Performance increases because performance/watt increases, not because watt requirements increase.
In this particular case this is almost completely negated by the power savings over 80+ bronze by the time the PSU needs to be replaced.
I completely agree with you that we've reached a plateau in the total power draw required by PCs. However, as we've seen over the past 5 or so years, the required voltage distribution changes as do connectors. 5 years ago, you would have seen PSUs out there with lots of power on the 5V, which is hardly used today. You also wouldn't have seen very many PCIe or SATA power connectors. Instead, you would have seen lots of Molex, which is also not really used today. So, while the form factor hasn't changed, the actual guts of what makes a good PSU have.
Also, when I did my calculation, I did best case for the X650 based on the limits of the 80Plus spec. If both PSUs fall somewhere in the middle of their respective bands, the break-even point goes out even further. Also, 150W average is a pretty high figure based on gaming 8 hours a day, which helps the X650 a lot. I didn't explicitly state this before, but I should have. I still think that, in light of all the factors, 5 years is too long of a time horizon.
So yeah, an X650 is a good PSU, I just don't think that it is $110 good and won't recommend it as such. That doesn't mean that my recommendations are the only good recommendations though.