When it comes to memory overclocking, Intel's Socket 1156 platform much more attractive than the 1366 platform. Nevertheless, some points should be considered. The new architecture of the processors are obtained for the Memory Overclocking completely new aspects. Since the memory controller from the motherboard to the CPU moved, you need now instead of a good motherboard a good CPU. The blame for low memory clock is now therefore no longer the main board, but to look at the CPU. Also has been the subject of "tensions" changed a lot. At the start of the Core i7 spread the rumor that the CPU may use a maximum of only 1.65 V as memory voltage. Meanwhile, has been shown that a higher voltage is quite possible. As a higher voltage effect in the long run is not exactly known. Nevertheless, there is such a warning is not without reason. Of course it is up to you how much power it expects of the memory controller. Also, we should be aware of the loss of warranty.
However, there is one crucial point about memory overclocking "for base 1156-systems: the Uncore clock. This is always min. 1.5 times as fast as the memory, depending on the largest memory divider of the CPU is available. In practice, the following calculation:
Core i7-8x0 (up to DDR3-1600 divider):
BLCK * Uncore Multi 18x = Uncore clock
133 * 18 = 2.400MHz clock Uncore
200 * 18 = 3.600MHz clock Uncore
BLCK 200 x memory divider (6x/8x/10x/12x) = max. DDR3-2400 at Uncore 3.600MHZ
Since 1156-base systems only have a maximum memory dividers for DDR3-1600 can store higher frequencies can be achieved only on the increase of BLCK. The Uncore clock is independent from the actual CPU clock and can be increased only by the BCLK Uncore Furthermore, the clock still responsible for other constituents in Uncore area such as the DMI-Controller, IMC (Integrated Memory controller and L3 cache realize. With a BLCK of 200MHz is also a memory clock can be of 1.200MHz (DDR3-2400) are. However, needed for high clock rates correspondingly high IMC voltage. Here is Intel a limit. Ideally, local people work the system with an IMC voltage of 1.15 V (standard), but Intel has released more than 1.35V.
To push the memory to its maximum as the motherboard is a Gigabyte P55-UD7 used. When a CPU uses Intel Xeon UP X3460. This is identical to the "desktop counterpart" Intel Core i7-860. In addition to the maximum clock rate and the lowest latency to be tested. There is even without overclocking the opportunity to improve the performance of memory. The maximum clock rates are determined at three different voltages: 1.50 V (JEDEC standard), 1.65 V and (standard voltage) and 1.75 V. The test system is tested against the remainder with another Memory and running with a memory clock beyond DDR3-2500 (2.250MHz). For the maximum latency set of CL10-12-10-301T, the Memory of Patriot maximum 1.254MHz (DDR3-2500) reached at 1.65 V. With the factory timings of CL9-11-9-27 was up to 1.218MHz (DDR3-2436) is possible. This limited the tRAS value. If this example to 28 or more relaxed, the memory can overclock a bit further. Even at 1.5 V provides the kit from good results and allows the DDR3-1600 mode with CL6-8-6-24. The DDR3-2000 mode was CL7-9-7-25 is possible with 1.65 volts. A higher memory voltage of 1.75 V did not improve - the kit does not scale to more tension.