FSP is now listing the FSP500-50FSPT, a 500W, 80+ Platinum FlexATX PSU on their website!
That thing has a higher power to volume ratio (>1000W per Liter) and is more efficient than the ST45SF-G, ST60SF-G and the SX500-LG PSUs!
Breakdown of the features:
Dimensions: 150x81.5x40.5mm...