About the external power supply, I think the DC external connector is the same as for the DH61AG because this is the next-in-line upgrade for Intel's only thin mini-ITX. The 2.5 ID/ 5.5 OD specs for the plug might be a misprint/mistake by Intel; I have the same specs in some notes I got from pre-introduction gossip but the best source for accurate information from Intel is any document that does not have pictures of people in it (i.e, technical documents). I have not called Intel Help on this because when I called to notice that some of the spec sheets they had online listed the DQ77KB as using 240-pin DDR3 when it is obvious the board uses 204-pin SODIMM, I spent 30 minutes gettings nods and thank you's but none of the incorrect documents have been changed. For the right plug, check with Mini-box.com or atechfrabrication.com.
I noticed some problems I had with what I thought was a dream thin-mini-ITX, the DQ77KB in an earlier message in this thread. Here are some more notes:
1. The audio codec is ALC-892. The signal to noise for this codec is about 90dB for output. That's not great, and wouldn't replace very many soundcard options. So if you want great sound quality and want to use a DQ77KB, think about using a soundcard, and there goes the PCI-e 3.0 slot (remember, it is just four lanes of 3.0). The DH77DF board from Intel has the 898 codec and bring the signal to noise up to 110dB--that's a real challenge to most available sound cards. The DH77DF is a mini-ITX but stands about an inch higher than the DQ77KB.
2. The only third-generation i7 processor you can use with the DQ77KB, according to Intel, is the 3770s. You can't use the k (unlocked) or the t (low-power) versions. This means you can't change the CPU or memory clock with a DQ77KB (except possibly reducing the native speed of the processor in the BIOS to control temperature).
3. The paradox is: why have 3rd generation processors that are supposed to save energy but can't use low-voltage memory? The solution is: use low voltage-rated memory (DDR3U- DDR3 L1.25- 1.35V) but use the higher (1.5) voltage required for the 3rd generation processors for over-clocking the memory. The problem is, you can't change the clocks on the XXXXs processors that are required for the DQ77KB.
My question to the readers is: can you use the 3770K in the DQ77KB, not at 77W TDP but 65W TDP by underclocking it? Maybe Intel does not list the 3770K as compatible with the DQ77KB because if you let it fly at 77W it would destroy the board, but in more careful hands... Let me know if anyone has tried it and thanks.