I have a similar problem with a DZ77BH-55K and the memory voltage but for me the voltage is under my setting. I put 1.65 and the mainboard displays 1.52 or 1.59, in the OS with different monitoring softwares, the voltage is at : 1.632 or 1.648, i saw that when i boot for the first time, i have 1.632 and when i reboot i've 1.648. it depends, but the system is stable with prime95 and memtest with 1.632 or 1.648.
The timing memory is on manuel mode at 10-12-11-24 @1200MHz 2x4GB Gskill F3-17000CL9D-8GBXM.
Perhaps that the voltage of sensors bug.
It's definitely not a sensor bug. I can set the memory voltage to 1.20 volts, and the system is still booting (voltage displayed in BIOS an under Windows stays at 1.46-1.48 volts). Since I'm using standard 1.5 volt DDR3-SDRAM (which won't boot with 1.2 volts), this can only mean, that the DH87RL is ignoring any setting concerning the memory voltage.
I was able to get the Intel® Turbo Boost Technology box checked with an Intel® Core i3 processor. However, after saving the changes and restarting the option remains disabled. So, even though we can probably agree it looks like a bug, it is merely cosmetic because the option does not remain enabled (or saved) since the processor does not support it.
The memory voltage indeed remains close to the 1.5v value because the memory controller in the processor supports this voltage with a tolerance of plus/minus five percent. Other low power processors support 1.35 volts such as U/Y lines of products.
may I quote the official Intel website:
"Delivering the same performance as Intel® Desktop Board DH87MC, Intel® Desktop Board DH87RL provides open socket flexibility to increase processing performance to meet your need.
Intel Desktop Board DH87RL supports 4th generation Intel® Core™ i7/i5/i3/Celeron® processors in a land grid array (LGA) 1150 socket. The board features PCI Express* Mini Card connector, PCI Express 3.0, and dual-channel DDR3 1600 with four DIMMs (32 GB max), with 1.2 V to 1.8 V memory voltage control for maximum DIMM compatibility, which supports the Intel® Extreme Memory Profile (Intel® XMP)."
another Intel document:
"System memory features
The board has four DIMM sockets and supports the following memory features:
1.5 V DDR3 SDRAM DIMMs with gold plated contacts, with the option to raise the voltage to support higher performance DDR3 SDRAM DIMMs.
1.35 V Low Voltage DDR3 DIMMs (JEDEC specification).
Two independent memory channels with interleaved mode support.
Unbuffered, single-sided or double-sided DIMMs with the following restriction: Double-sided DIMMs with x16 organization are not supported.
32 GB maximum total system memory (with 4 GB memory technology).
Minimum recommended total system memory: 1 GB.
Serial Presence Detect (SPD).
DDR3 1333 MHz to DDR3 1600 MHz SDRAM DIMMs.
XMP version 1.3 performance profile support for memory speeds up to 1600 MHz."
If you say, that only U/Y processors (which are BGA processors) are capable of using low voltage memory, these official technical documents are wrong.