Hello,
1. AIDA64 said that my Ripjaws memory is recommended for 4 DIMM's.
2. I still don't know why the supplied memory voltage is less than the setting in BIOS: is the onboard power management software in error, or are the voltage regulators/supply connections defective, say by too much internal resistance (I should return for a replacement)? At the default 1333 MHz and 1.5 v BIOS settings (CPU at 3.5 MHz.), the system is unstable, often gives memory errors.
3. If the deficient memory voltages are compensated for by using higher settings in the BIOS, both 1333 MHz and 2400 MHz will run in Windows (once installed), and test without error by memtest86, prime95, and Intel Extreme Tuning. At least between the CPU and memory there is no bandwidth problem (once the voltages are fixed up). (CPU at 3.5 MHz.)
4. Although the memory tests OK at 2400 MHz (with the voltage bumped up), a Windows 8.1 Pro 64 installation DVD would not then run correctly in an optical drive. Windows installation required 1333 MHz (voltage 1.5125). The mSATA system boot drive did not develop errors after some days of use. Afterwards I changed the memory to 2400 MHz (for testing), but then in a few days the mSATA system boot drive developed errors. It appears that the CPU can work with the memory at 2400 MHz, but I/O devices have a problem, more so for the slower optical drive than for the SSD mSATA. So there is some sort of a bandwidth, or timing, coordination problem between the memory at 24000 MHz and SATA I/O. I don't know if this would be called DMA synchronization error. Consequently, the memory cannot be used at 2400 MHz, but not because of a bandwidth problem with the CPU. (CPU at 3.5 MHz.)
I apologize if this seems to be a repost, but I think this time the issues are less tangled.
This motherboard/CPU combination continues to promise to be something special. Thanks to all concerned.
Tom