Originally Posted by wolverinegod
It's hard for me to comment on that as I'm not entirely sure which options you selected and i'm by no means a power expert ... that said, I just filled out a regular desktop with the g530, one dram ssd, one dvd burner and it says the system needs 130 for me (not 174). I know that site adjusts for things like form factor as well, but i think it's a good starting point. I've read several writeups on it from sites like maximumpc and i have yet to see anyone say it's terrible (i'm not saying it is or it isn't, i'm in no position to judge ... i'm just saying that those that are seem to speak highly of it from what i can tell).
Without knowing how they calculate it, it's hard to understand how accurate it is for these low power systems. I can't explain the discrepancy without knowing their method. I only know what's I've measured which has been pretty consistent. I measure the usage of every new build that uses different components with the Kill-a-Watt at the desktop, playing 1080p and with Prime95. Of course, who knows where I wrote it down...
. SandyBridge 65W TDP, 4GB RAM, 64-128GB SSD and a tray or slot-load burner is usually around 25W-30W desktop, 40W 1080p video, 55-60W Prime95.