Is this dual channel or async?

[Rover4444]

I have two pairs of RAM sticks, each pair with different sizes. Both pairs have the same speeds and timings. If I put one stick from each pair in each channel, would it run in dual channel, or asynchronous dual channel/flex mode?

An example configuration would be 16x8x16x8 in a A1xA2xB1xB2 motherboard.

 

[Macro Device]

Async of course. You'll have 8+8+8+8 for TRUE dual channel and 8+0+8+0 for the second layer.

 

[Rover4444]

Async of course. You'll have 8+8+8+8 for TRUE dual channel and 8+0+8+0 for the second layer.

Why? In a 16x8x16x0 configuration the first and third would run in dual channel while the second would run in single for an async setup. I think it'd still be dual given the configuration in each channel is identical.

 

[ir_cow]

1-3 and 2-4 ram slots share the same channel. Very rarely is it the opposite. Either way it's not 1-2 a 3-4.

Not sure what you mean by synchronous or asynchronous for ram. Asking single channel or dual channel?

You can't have more than 2 DIMMs per channel for a 4-DIMM motherboard.

 

[Rover4444]

1-3 and 2-4 ram slots share the same channel. Very rarely is it the opposite. Either way it's not 1-2 a 3-4.

Wrong. You've got things mixed up, the truth is the exact opposite of what you're claiming.

Not sure what you mean by synchronous or asynchronous for ram. Asking single channel or dual channel?

No. Asynchronous dual channel/flex mode occurs whenever you use RAM modules with different capacities or use a third DIMM slot.

You can't have more than 2 DIMMs per channel for a 4-DIMM motherboard.

This is not relevant to my question.


Anyways guys I found the answer here, it looks like it's dual channel:

 

[ir_cow]

Ah your right. Brain fart. First 2 and last 2 are the same channel.

 

[agent_x007]

If both channels have equal number of sticks and capacity per channel matches, they should work in "full speed" Dual Channel mode. You simply need to put each dual channel kit in matching DIMM channels.

In practice (for current Intel and AMD stuff) : If, for example, 16GB stick goes into first slot closest to CPU socket, the matching stick to it should be put in 3-rd DIMM from socket (on dual channel capable motherboard). Then one 8GB would go to second slot from socket, and the other 8GB stick in forth one.

You can do it for vastly different pairs of memory sticks too (dual channel will work for example on pair of 2GB DDR4 get's matched to pair of 16GB DDR4), BUT you may encounter boot issues if MB/EFI can't figure out timing training for all sticks at once (default JEDEC profiles are too different for example).