I write from PC, there are installed now:
Motherboard: Gigabyte GA-P35C-DS3R but not 2.1 or 2.0, my ver. 1.1 (but read below)
BIOS Version: Intel P35 BIOS for P35C-DS3R F12 (SLIC added)
CPU Type: QuadCore Intel Xeon E5430, 2666 MHz (8 x 333)
and 8Gb DDR3 1866MHz
DIMM1: Kingston HyperX KHX1866C9D3/4GX (Manufacture Date: Week 44/2012)
DIMM3: Kingston HyperX KHX1866C9D3/4GX (Manufacture Date: Week 44/2012)
But BIOS files of rev 1.x, 2.0, 2.1 are identical byte-to-byte, MB descriptions are the same, it's mean that in logic of different revisions are no differences. May be used different manufacturers of components as capacitors etc. But 8Gb of DDR3 DRAM works PERFECT! Tested by different stress tests and tests for memory.
Initially, MB didn't start with both modules, but i've tried with 1 at first, PC started correctly, then I added a second module and about 2 years them works fine.
Hope this info will be useful)))