i7-5820k X99 board 96GB Memory from different capacity/speed RAM sticks

[seabird5050]

My computer has the following specs

CPU: Intel i7-5820K
Motherboard: Gigabyte GA-X99-Gaming-5P
Memory: 64 GB (4 x 16GB DDR4)

The motherboard supports up to 128 GB memory but the CPU specs say it supports 64 GB maximum memory.

Found a blog on PC World that claimed a similar spec PC took 128 GB. I happen to have a a 4 x 8 GB spares lying around recently and wanted to give it a shot. It Works !!! My PC now has 96 GB of RAM.

1. Why is it working ? Intel CPU specs say 64 GB max.

2. The X99 is quad-channel so I installed the 16GB sticks in Channel A / B and the 8GB sticks in Channel C / D. Is it good to keep it like that as the memory capacity / speeds are different ? Would it do any damage to the computer ?

4 x 16GB DDR4 2800 MHz (1.35V, 14-16-16-36)
4 x 8GB DDR4 2666 MHz (1.2V, 16-18-18-35)


Thanks,

Rick.

 

[Tradesman1]

Best to alternate - have a 16GB and an 8GB in each channel - which puts 24GB in each channel and all the DRAM running in quad. As is, it is running in Flex mode which would be 32GB in full quad with the remainder in dual or single