Why is 1.65v the maximum DRAM voltage? If you absolutely must run at 4.2GHz, just increase your VTT and bump up the VDimm to match and keep the .48 difference. It's not going to hurt anything, assuming you have your RAM properly cooled.
That being said though, I only ever run my VDIMM higher than 1.65v when I'm benching.
No need for me to raise it to run a stable 24/7 4.2GHz overclock fortunately, since this system hums along just fine with a .30 difference(VTT=1.37v/VDIMM=1.66v).
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