Precision 3640 uses JEDEC standard Ram. There is no XMP for this model. They often ship with OEM 3200 Mhz ram XMP but with 10th Gen  Intel Core i3/i5 processors, are limited to 2666MHz Intel Core i7/i9 processors, are limited to 2933MHz    
Which memory modules I should put in Precision 3640 Tower with Intel Core i9-10900K in order to get 2933 speed? I have tried Kingston HyperX FURY DDR4 3200 MHz (HX432C16FB3K2/32) and Kingston DDR4 2933 MHz (KCP429NS6/8), but they don't seem to get 2933, which is presumably because BIOS does not support XMP. Is there a chance of BIOS getting XMP support?
Precision 3640 memory upgrade