Bigbruin.com posted a review on the Ultra Products XVS Modular 600W ATX Power Supply

During testing of the Ultra Products XVS Modular 600W ATX Power Supply I did not encounter any serious issues. It is very quiet (especially once inside a closed case), and was indistinguishable over the other fans in the system. The supplied cables were long enough to reach everywhere in a Thermaltake Eureka full tower server case, and there aren't many cases bigger than that.

Ultra Products XVS Modular 600W ATX Power Supply Review