Intel historically supplies motherboard manufacturers with detailed architecture/engineering guides that help when designing boards, which is important when accessing various voltage lines. Recent moves to fully-integrated voltage controllers has meant that such access has been curtailed, none more so than on X99, where motherboard partners are pretty much left in the dark. Intel prescribes a range of voltages and adjustments that can be made in the BIOS, mobo guys follow suit.
Asus, however, believes the enthusiast should have unfettered access to all manner of voltage. Engineers, it says, have examined the LGA 2011-v3 CPUs in excruciating detail and deduced the role played by each of the pins on the bottom; the new chips have different pin-outs than their predecessors.
The end result is that, fully tapping into this new pin-out, Asus' OC Socket has more pins than a standard LGA2011-v3. The extra pin-outs, located at six sections around the socket, enable all Asus X99 boards to circumvent the voltage limits imposed by Intel and provides a means by which more voltage rails can be monitored. What's more, the company says, enhanced monitoring and regulation helps when really pushing the CPU to the limit (think 1.6V-plus), minimising voltage drops and increasing overall efficiency by only allocating the exact voltage required. Intel's integrated voltages, accessed by other boards, aren't that fine-tuned, apparently.
These pin-outs also control access to behind-the-scenes voltage and regulation of DDR4 memory. Asus goes further and says that its OC Socket, therefore, also enables X99 boards' BIOS to reduce memory voltage yet still increase DDR4 overclocking potential to levels higher than would otherwise be the case.