Thank you for the information. Please bear in mind that if you are using only one stick, to work on a single channel configuration it will be necessary to install the memory stick on DIMM 1, which is the first blue slot from the CPU socket. On a dual channel configuration, it is necessary to install the memory sticks on the blue slots (DIMMs 1 and 2).
For additional information on single, dual and multi-channel memory modes you can access:
Thanks for quick reply. However, this problem is not about single or dual channel configuration issues, it is about a motherboard bug when DIMM3 and PCIe card with legacy ROM inside x16 slot are used at the same time. I have 4 identical 8GB DIMM modules, but I have to take out 8GB from DIMM3 to be able to boot DQ77MK at all with a card inside PCIe 3.0 x16 slot... If I insert the card into that other PCIe 2.0 x4 slot, everything works fine, I can use DIMM3. However, I bought these motherboards in order to use all DIMMs as well as both PCIe x4 & x16 slots, but I can not.
I had tried all DIMM combinations, single module, two modules in single channel or dual channel config, three modules, etc... The system will boot only if DIMM3 is left empty. Tried this with two different DQ77MKs, same result, broken. Tried updating to v0056 UEFI firmware, same result, broken,
This is clearly a hardware bug, please try to reproduce this in your lab.
The list of PCIe cards I had tried:
- NC552SFP - dual 10GbE NIC (tried with two different firmware versions)
- Adaptec RAID 6805E controller
I just checked a -500 rev DQ77MK board with 4x 8GB Geil Corsa DIMMs. BIOS is rev 0056. I don't have the cards you tried, but do have a 3Ware 9650E-LP SATA II RAID PCIe x1controller. This worked fine with 2 drives connected in a RAID 1 config. I then tried an XFX GT220 PCIe x16 gfx card and an Intel dual GbE PCIe x4 card. They too worked fine in the PCIe x16 slot.
Have you tried the latest BIOS? It's now up to version 0057 and available from the Intel Download Center.
Also, check to make sure the DIMMs you are using are 1.5V. The system will support higher voltages, but this has to be selected manually in the BIOS.