16GB RAM for $100? That sounds like PC-10666 (1333MHz) RAM in which case you have created a bad bottleneck for your 'gaming machine'. Get faster clocked RAM over dumping a lot of ****, slow RAM. Minimum PC-12800 (1600MHz) Your gaming machine will appreciate it for you.

Everything has to be even. Don't buy the latest and greatest graphics card if you've got slow RAM, a slow CPU and a slow harddrive. Determine what your machines bottleneck is and improve that. Changing from an HDD to an SSD will often be a much bigger improvement for your machine then forking an extra $500 for a slightly faster CPU/Graphics card.