Uh, The "missing .5GB" isn't missing, it's there and it just runs at a slower chip because part of the GPU is missing a L2 cache chunk. not the ram itself. Replacing ram would do nothing. that is of course if you can even replace the ram on GPUs the packages are soldered directly onto the PCB and the traces and interconnects are much too small for human precision. That and i'm 99.9% sure you can't just BUY a .5GB Dram that will work with a 970 off of Ebay, lol.