Populating RAM DIMMs in quad socket H8QGL-F

[mlotek]

Hello,

I have a quad socket machine running x4 6274's as shown below

https://kudlaengineering.wordpress.com/2013/02/24/64-core-kopernik-is-born/

I am running CFD simulations on unstructured grids, so I require great bandwidth between my cpu's and ram (as I understand it, if populated correctly you will get quad channel).

I currently have x4 DDR-1600 ECC in P1-1A, P1-2A, P1-3A, P1-4A (all are next to CPU1). My questions:

1) Am I taking advantage of quad channel communication for all procs?
2) If I leave it like this, what is the performance penalty (just order of magnitude, or is it just couple%)?

Thanks for your help -

Tom

 

[RGone]

Memory Population for Optimal Performance – For a Motherboard
with Four CPUs (CPU1, CPU2, CPU3 & CPU4) Installed

CPU1 P1-1A P1-2A P1-3A P1-4A
and so on per cpu four sticks at a time to each cpu.

That is what the manual says about ram and population of the dimm slots. It looks like you could make do with 9 more sticks of ram though for the best performance. Nothing I have ever seen shows any performance hits or gains for less than full dimm population with four cpus.
RGone...