Small RAM dilemma

[Rym]

I wanted to ask here for confirmation, to my knowledge this combination I want to do should work perfectly together?

 

I have currently these 2x16GB SR modules: https://www.crucial.com/memory/ddr4/bl2k16g32c16u4b

 

I want to add these extra 2x8GB SR modules: https://www.crucial.com/memory/ddr4/bl2k8g32c16u4b

 

I want to add them to get the dual rank performance boost for my 5600x, which would range around a 10% increase.

 

 

Am I right in my thinking that there shouldn't be any problems mixing these 2 kits for this purpose?

[Kaaverik]

1 hour ago, Rym said:

I wanted to ask here for confirmation, to my knowledge this combination I want to do should work perfectly together?

 

I have currently these 2x16GB SR modules: https://www.crucial.com/memory/ddr4/bl2k16g32c16u4b

 

I want to add these extra 2x8GB SR modules: https://www.crucial.com/memory/ddr4/bl2k8g32c16u4b

 

I want to add them to get the dual rank performance boost for my 5600x, which would range around a 10% increase.

 

 

Am I right in my thinking that there shouldn't be any problems mixing these 2 kits for this purpose?

Sorry, but Ryzen can only support dual channel configurations for the dual rank performance boost (with only 2 modules) The DIMMs are the same speed and latency so they should work well in the system, and they will only run in dual channel mode because there is an even set of 4 DIMMS present.  Threadripper allows for Quad channel, and it also has more RAM slots.

 

EDIT: single channel mode for 4 DIMMS is not real, it is a fluke. 2 or 4 DIMMS will work in dual channel mode on Ryzen systems

[Jurrunio]

22 minutes ago, Rym said:

Am I right in my thinking that there shouldn't be any problems mixing these 2 kits for this purpose?

Be prepared to redo the frequency and timings because the XMP is not rated to do so. The sticks will run, just most likely not at the speed they advertise.

 

7 minutes ago, Kaaverik said:

Sorry, but Ryzen can only support dual channel configurations for the dual rank performance boost (with only 2 modules) The DIMMs are the same speed and latency so they should work well in the system, but they will not run in dual channel mode because 4 DIMMS are present. The system will revert back to single channel mode for each DIMM. I know because when i upgraded to 32gb of ram (4x16gb) my system reverted back to single channel mode. It is an architectural design. Threadripper allows for Quad channel, and it also has more RAM slots.

That's complete crap. Your 4x16GB system needs a check, it shouldnt do that.

[iMxmo]

35 minutes ago, Kaaverik said:

Sorry, but Ryzen can only support dual channel configurations for the dual rank performance boost (with only 2 modules) The DIMMs are the same speed and latency so they should work well in the system, but they will not run in dual channel mode because 4 DIMMS are present. The system will revert back to single channel mode for each DIMM. I know because when i upgraded to 32gb of ram (4x16gb) my system reverted back to single channel mode. It is an architectural design. Threadripper allows for Quad channel, and it also has more RAM slots.

4 DIMM's on the 5600X will be dual channel. It has two memory channels..

51 minutes ago, Rym said:

Am I right in my thinking that there shouldn't be any problems mixing these 2 kits for this purpose?

Mixing different kits of ram may prove troublesome, you will most likely have to adjust timings/frequency 

[Kaaverik]

37 minutes ago, Jurrunio said:

Be prepared to redo the frequency and timings because the XMP is not rated to do so. The sticks will run, just most likely not at the speed they advertise.

 

That's complete crap. Your 4x16GB system needs a check, it shouldnt do that.

My bad, it was still running in dual channel mode. Edited to reflect the change!

[YoungBlade]

I have a similar configuration on my computer, 2x16GB + 2x8GB TeamGroup Vulcan Z DDR4-3000 16-18-18-38, with a Ryzen 9 5900X. It works just fine. I'm even overclocking the RAM to 3200 speeds with the XMP timings enabled.

 

So it can work just fine. There's a chance that the memory controller will have issues and you'll have to adjust speeds and/or timings to compensate, but there's also a chance it'll just work no problems. We can't know which way it'll go until you try it.