Memtest stable? What voltage did you use?
From my testing it was *kinda* stable at 1960 same settings and voltage (1.65V), but 1T.
Every 1MHz HTRef up, required one step higher voltage. So, for 2000 1T I'd need around 1.72V or higher.
Can run 2000 8-8-8-24 1T 1.65V, but it's not memtest stable.