This is not my machine but my soon to be Step Grandson's. My son built it for him and it's an online gaming machine.Most of the components are all named brands, MSI motherboard,Phenom 2 Quad Core.2x AsusGTX 550ti,Crucial Memory.However the PSU is a Q-Tec 650W Triple Fan Model and I don't think it's SLI capable. Am I wrong in thinking this.At idle the machine seeme to be OK but as soon as you start gaming (single or multiplayer)both cards heat up at an alarming rate.Also the frame rate while gaming at any setting is rubbish(25-30)but I had to shut the machine down after 15 minutes. Thank you in advance for any advice or solutions to this problem. Grandad John