So

Im testing 1600EB 4GB kit, had this ram well over 1800MHZ on P5E3 Premium.

1600 no way, 1500 no way, 1400 ish, 1333 jeez is it fast

This board is sooooo tight and must be at 1N by default it just hates 128IC's x16, to much load me thinks.

I will contat Asus and see what I can do with bios, for now try to keep the 4GB kits around 1333 6-6-6-(18>22 for TRAS) and test tRD at 6 or 7 tRFC can be 48 clocks.

This board is really fast with the ram like this, probably faster than 7-7-7-24 2T 1600 so do not think you are giving performance away as you are not.

more soon