Whatever you think about the Steam Machine, the fact is it's launching into a brutal market for anyone trying to sell a gaming product. So brutal, in fact, that Valve has been unable to source the 8GB SODIMMs that it originally planned to use in pairs in the system. As a fallback, Valve has had to ship at least some portion of Steam Machines with a single 16GB SODIMM instead of two 8GB modules.This, obviously, won't activate the back half of the Hawk Point 2 processor's memory controller, leaving the system with just a 64-bit memory interface like an OG…