topic Re: Does i7 5820k with 64GB RAM support quad channel mode? in Mobile and Desktop Processors

Does i7 5820k with 64GB RAM support quad channel mode?

iianj1 — Mon, 22 Aug 2016 21:44:10 GMT

I was just about to purchase and i7 5820k from OCUK when I saw this comment which worried me. From what I can gather this person is suggests that if you max out your board with 64gigs and youre running a 5820k it will NOT run in quad channel. Is this correct? I cant find information stating this on the intel site.

Additionally on the specifications pages, under CPU specs - Max RAM I note the qualification 'depending on memory type'. Does this mean the speed of the RAM? And if so what exactly is the limitation? Do certain speeds have a lower maximum GB of RAM?

This CPU is pretty fast, everything opens up instantly - and I can run quite a few VM's.

However there was one thing that has given me a bit of grief over the last few days. I have the EVGA X99 FTW mobo and it can support up to 128GB of RAM. I have two quad-channel kits of 32GB DDR4 2400MHz. However when installing that amount - the board would not boot. When lowered to 32GB, it booted fine.

After much messing about - and emails pinging back and forth to EVGA support about trying this and that - I checked the CPU specs on Intel ARK - and the i7 CPU's (even the extreme) can only support a max of 64GB - and this is single channel (I have 2 kits of 4x 8GB Quad Channel DDR4 2400Mhz).

To get the system booted - I had to slow the RAM down in the XMP profile to 2133MHz - otherwise it would either fail to boot, or only register some of the RAM (for example 48GB, or 32GB when all 64GB was installed).

If like me - you need this amount of RAM (or more) go for the Xeons instead.

Message was edited by: ian jarvis

Re: Does i7 5820k with 64GB RAM support quad channel mode?

idata — Tue, 23 Aug 2016 15:53:51 GMT

I was not able to find that statement either at Intel.com;however, I did notice that the processor model i7 5820k will handle DDR4 1333/1600/2133, that will be according to ark.intel.com.

Please bear in mind the memory controller hub is part of the processor and it will support up to 2133 memory speed.

Allan.

Re: Does i7 5820k with 64GB RAM support quad channel mode?

iianj1 — Tue, 23 Aug 2016 17:49:50 GMT

Thanks for the reply Allan, I wonder if that gentleman was having problems because he was running memory at over 2133mHz.

Could you offer any insight on the 'depending on memory type' thing? What type exactly do we have to use for the full 64 GB capacity to be available and function correctly? What happens if we have the wrong type and what IS the wrong type? Its bizarre for intel to add such a vague qualification which implies a huge impact on your system if you make a mistake.

Re: Does i7 5820k with 64GB RAM support quad channel mode?

idata — Wed, 24 Aug 2016 15:53:42 GMT

I understand for "memory type" the memory speed since the controller is part of the processor, this will follow the processor specifications.

As far as I understand, the motherboard maker should provide a list of suggested DDR4 that can help reach up to 64GB:

http://www.evga.com/support/motherboard/ http://www.evga.com/support/motherboard/

The content on the above site is not controlled by Intel. This information is offered for your convenience and should not be viewed as an endorsement by Intel for the merchants or services offered there.

Allan.