1. Take the current motherboard, CPU and RAM.
2. Throw them in the bin.
3. Replace them with an i3 CPU + board + 2x 4GB DDR3-1600.
4. Replace the GTX 660 with a card that more closely matches the performance of components in (3), e.g. a GTX 650.
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The QuadFather: 4x4x4x4
4 cores (QX9650) / 4 GPUs (2x 9800 GX2) / 4x 2GB DDR2-800 / 4 hard disks (quad 320GB Seagates, RAID-5)