My 7010 MT has A29 BIOS reports 1600MHz for a RAM speed.  It has the Hynix (I think) RAM it came with + A-Tech that I added.  3 slots = 12GB.
I have an Optiplex 7010 DT motherboard.  The motherboard's mounting slots conform to ATX spec.  CPU fan mounting holes also conform to Intel's CPU fan.  Installed the latest A29 BIOS/cleared CMOS.  Encountered two issues after a clean install of W10 Pro: 1.  Literature shows DDR3 1600 MHz memory speed when paired with 3rd generation Intel iX CPU.  The 3rd gen Core i7 3770 is capable of supporting DDR3 1600 MHz.  However, the BIOS and CPUz report a memory speed of DDR3 1333 MHz. 2.  Device manager reports two missing drivers, PCI SERIAL PORT and PCI SIMPLE COMMUNICATION DRIVER. Thank you, F
Optiplex 7010 DT DDR3 Speed and Missing Drivers