Rumor: Haswell-DT will bring RCR to Shark Bay LGA 1150 platform
Since the introduction of microprocessors second generation intel core “Sandy Bridge”, the overclock was relegated to the upper range “K-Series” , thanks to the introduction of the integrated clock generator in the CPU, a feature that remains in microprocessors Third Generation Core.
The clock generator integrated in the CPUs Core of 2nd and 3rd generation LGA 1155 socket prevents that overclock in microprocessors that do not have the multiplier Unlocked “K-Series” or lacking Turbo Boost technology, because the increase bus frequency over 5MHz, also alters the frequency of DMI and pcie bus, causing data corruption and instability in the team.
The socket enthusiast platform LGA 2011 Intel microprocessors made by Sandy Bridge-E and Ivy Bridge-E future, has a technology called Reference Clock ratio (RCR), thanks to which, the bus frequency is DMI and PCIe BCLK somewhat independent, provided fixed multipliers are used as 1.25x (125MHz) and 1.67X (167MHz) for BCLK thus can achieve a good clocking range, although the microprocessor lacks multiplier unlocked.
During IDF2012, Intel said its future microprocessors based on Haswell for socket lga 1150 “Haswell-DT” with enhancements focused on overclocking, so presume those Expreview bring RCR technology (or something similar), at least the high-end models, allowing more overclock, especially in microprocessors that lack unlocked multiplier.
This is not yet a fact confirmed by Intel, but may Expreview speculation is correct, then these constraints on overclocked are not present in non-Intel microprocessors, and incorporate a measure of RCR would lure back the overclockers low budget.
Link: Haswell支持外频比率调节，超频性能或将质变 (Expreview)Tags: blocked, bus, core, CPU, DMI, Haswell, Haswell-DT, intel, lga 1150, overclock, overclocking, pcie, RCR, Reference Clock ratio, Unlocked