Raptor Computing Systems Community Forums (BETA)

Raptor Computing Systems Hardware => Talos II => Topic started by: pocock on August 30, 2022, 02:56:21 am

Title: different memory sizes on each CPU in multi-CPU systems?
Post by: pocock on August 30, 2022, 02:56:21 am

For dual CPU systems, is it necessary to have an identical memory configuration on each CPU?

For example, if a user has 4 x 16GB on CPU1 does that mean the user must have 4 x 16GB on CPU2?

Or can the user have 4 x 16GB on CPU1 and 4 x 32GB on CPU2?

Title: Re: different memory sizes on each CPU in multi-CPU systems?
Post by: ejfluhr on September 01, 2022, 02:13:45 am

I believe the processor hardware can support different memory configurations on different sockets in a system.  I suspect it depends on support in the firmware and/or software, not the hardware.

Title: Re: different memory sizes on each CPU in multi-CPU systems?
Post by: amock on September 01, 2022, 05:31:22 pm

The User's Guide has RAM installation tables that show you can have any number of DIMMs between 1 and 16, so it is possible to have different numbers of DIMMs for different processors.  I haven't tested it, but that makes me think the DIMM sizes do not need to match between processors.  They have their own memory controllers, so that also points to not needing to match RAM between CPUs.

Title: Re: different memory sizes on each CPU in multi-CPU systems?
Post by: ClassicHasClass on September 01, 2022, 09:54:08 pm

Correct, they do not need to match. That said, I like the symmetry.  8)