Firmware update for old DDR4 memory?

Hi,

I recently added more ram to my old computer but when both kits are added, memtest86 11.0 fails.

Board: MSI B360 Gaming Pro Carbon
Old RAM: Patriot Viper  PVE416G266C6KGY 16GB  2666 CL16 1.2V
New RAM: G.Skill F4-2666C19D-32GIS 32GB 2666 CL19 1.2V

The timing info from the Patriot EPROM is odd. Is there any update?

---=== Timings at Standard Speeds ===---
AA-RCD-RP-RAS (cycles) as DDR4-2133              15-15-15-36
AA-RCD-RP-RAS (cycles) as DDR4-1866              13-13-13-31
AA-RCD-RP-RAS (cycles) as DDR4-1600              11-11-11-27

there is no 2666 entry, while the RAM was sold as 2666 C16.

Part Number                                      2666 C16 Series

The timing does not allow 2666 C16:

Minimum RAS to CAS Delay (tRCD)                  13.500 ns

In the past I forced 2666 which just worked fine. and was a little bit faster than the new RAM with C19.

But with both kits fitted the auto config seems to totally freak out.

thanks