On SR 4000cl14 b-die A2 pcb I can't even get as much as you on DR.
Tested with bios 003, 901, 1303, 1304.
vddq 1.5-1.55v sa 1.45v
I can't get more than 4000 MHz on two sticks.
If I set the dram voltage to 1.8v, then it turns out to take 4100 cl 14. Or with one bar on slot B2 4133cl 15 to 1.8v at a memory temperature of about 16 degrees.
Still earned 3800 cl 12 at 1.8v and 4000 cl 13 at 1.7v.