Is your 920 able to run 4GHz Uncore without RAM being at 2000?
Maybe you could do yourself the favour to fill out (copy it here and fill out) the BIOS template for the classified:
http://www.evga.com/forums/tm.asp?m=...&key=%EF%BF%BD
It's not easy to find the right balance between vtt and vdimm and the fitting RTL configuration. Subtimings matter as well. So please be detailed and it would definitely help to get you a signature with your system specs so that we can see what you got at first glance.

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