I haven't...but that doesn't mean there hasen't been savings. I have the Neo 480 Watt and I can't say I've seen a difference worth mentioning. Given the amount of things I changed, it's really hard to notice a true savings via power supply anyway. The newer CPU I have consumes less power, so that throws off the results. Plus, my electric company's prices fluctuate so I'd have to get a unit to measure the true power consumption of just my one PC in order to tell. I guess my point is, I didn’t buy it for power savings…just increased capacity.