Dual or Quad Core Intel Xeon up to 3GHz! Every Mac Pro offers the incredible power of two 64-bit Dual-Core Intel Xeon microprocessors — with 4MB of shared L2 cache per processor and 1.33GHz dual independent frontside buses. You choose the processor speed — 2GHz, 2.66GHz, or 3GHz. Up to 32GB RAM Configure your Mac Pro with up to 32GB of 667MHz DDR2 fully buffered ECC memory. This new fully buffered memory architecture allows for greater memory capacity, faster speeds, and better reliability, and at 256 bits wide, it boosts memory bandwidth and application performance. APPLE Compatible 8GB 667MHz DDR2 FBDIMM Kit (2x4GB) $995.00 APPLE Part# MA686G/A Compatible 4GB 667MHz DDR2 FB DIMM Kit (2x2GB) Regular price: $210.00 Sale price: $180.00 APPLE Part# MA685G/A Compatible 2GB 667MHz DDR2 FB DIMM Kit (2x1GB) $100.00