Can Ripjaw and Sniper work together at 1866 speeds?

[Gasmachine]

I recently built my system with the following specs:

G-skill sniper 2x4gb (2 kits) with 1866 speed rating:
G.SKILL Sniper Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-14900CL9D-8GBSR
DDR3 1866 (PC3 14900)
Timing 9-10-9-28
Cas Latency 9
Voltage 1.5V

i7 3860 CPU

MSI motherboard (the one with 8 memory slots) with 2011 CPU slot
MSI X79A-GD65 (8D) LGA 2011 ATX Motherboard

670GTX NiVIDIA

The system was working great and stable with XMP profile enabled with the 16gb sniper memory running at 1866 without any changes in any other settings. I don't overclock my CPU.

Then G-skill Ripjaw memory kit 4x4gb (with 1866 speed rating) went on sale and I couldn't help myself so I bought it.

G.SKILL Ripjaws X Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-14900CL9Q-16GBXL
DDR3 1866 (PC3 14900)
Timing 9-10-9-28
Cas Latency 9
Voltage 1.5V

I put the Ripjaws kit in my system for a total of 32gb of RAM. Everything runs stable without any tweaking at 1600. However, when I try to set the XMP profile to 1866 (without any other setting changes) the system crashes.

I know how to access manual settings for memory in the bios but have very little experience of ever changing voltages. Please give me your experience on mixing sniper and ripjaw and how to get them to run at 1866 on my system. Thanks for all your help.

[Tradesman]

First I'll give you the standard spiel I pass along, any time you mix sets it can be problematic, even with the same exact sets. Here I'll add no guarantee, but think we can prob get them to run at 1866. To begin on this, disable or turn XMP off, it won't work well with two sets, the programming is for the packaged set. Manually set the freq to 1866, set the base timings to 9-10-9-29, set the CR to 2T (or 2N if the N designator is being used), set DRAM voltage to 1.56, set the MC voltage (believe it's CPUVTT on your mobo) to 1.18 and give it a try....if any problems may need adjustments to the advanced/secondary DRAM timings, notably the tRFC so might just check it and if on the lower end, try about 164....regardless, if problems post up your DRAM settings and system voltages