929 W for the $2000 overclock (that's peak load) but still that 850W PSU is getting maxed.
SSDs are a lot faster but you are overestimating their speed. If you are comparing the SSD raid you have in this build with, say, a 7200 RPM HDD, load times will NOT be 1/8th as long. The best you can do with most games is about 1/3 - despite the fact that the SSD array is more than 3 times as fast. You have to consider other potential bottlenecks.What you will notice with an SSD is that levels will load in 1/8th the time, and that for every other practical usage scenario (internet, productivity, file copying, booting, program installation etc...) you'll notice a huge difference by spending a few bucks on an SSD.