Hello Dark MantisI had same problem with other psu - freezing and rebooting endlessly. This psu: OCZ600SXS2. Stock radiator till next week (well stuck to mobo). Gigabyte has memory on support list (only difference - khx8500d2k2/1gn, me - khx8500d2k2/4g). http://download.gigabyte.eu/FileList/Memory/motherboard_memory_ga-ep45-ud3lr.pdf Kingston website does not show khx8500d2k2/1gn at all! http://www.ec.kingston.com/ecom/configurator_new/modelsinfo.asp?SysID=54899&mfr=Gigabyte&model=GA&search_type=&root=us&LinkBack=http%3A%2F%2Fwww.kingston.com&Sys=54899-Gigabyte-GA-EP45-UD3LR+Motherboard&distributor=0&submit1=Search . Tried and had same problem with OCZ2N1066SR2GK (on Gigabyte list). OCZ2N1066SR2GK works fine with older Gigabyte mobo. I did memtest with OCZ2N1066SR2GK, no errors.