Consider it just Specultaion Intel X99 seems the perfect choice for the Mac Pro form factor instead C60x (read C602, C603... C608). X99 support ECC and NON ECC DDR4 and Quad Channel (as the Mac Pro requires), provides 14 USB3 ports, NVMe storage comptatibility (faster than m.2), 40 PCIe 3.0 lanes (the Mac Pro requires 32 for GPU, this leaves 8 lines for 2xThunderbolt 3 heads, each head comprises 2 phisical ports ) plus 8 PCIe 2.0 Lines (good for 2 more Thunderbolt 2 heads), do not provides vPro (who cares?), and bursn only 6.5W (1.5W less). Interesting the X99 platform, supports core i7 upto 8 cores (on the mac pro form factor we only could hope on 6 cores version due TDP of 130W) on Non ECC DDR4, and Xeon E5v3 Upto 18 cores, which includes the E5-2690v3 with 12 at same TDP as the current 12 core xeon on the nMac Pro (and 400$ cheaper), also switching to X99 will save some bucks on the Motherboard, requiring less complementary chips (besides the X99 is cheaper than C60x). Notorious, the X99 opens the possibility to an more mundane Gamer-Aimed Mac Pro with core i7 (and surely Radeon R9-395x2), whithou requiring to develop an different motherboard and keeping the same thermal core. I'm convinced at least the next Mac Pro will be on X99 and Xeon/AMD Dx10 GPUs, but Apple could sell quick an lesser "pro" Mac pro on with i7-Radeon 300 series gpu.