Do Intel processor RAM limits double with 2 CPUs?

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Tiger Minecraft

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Mar 11, 2014
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The Intel Xeon E5-2687W supports up to 256GB of RAM. Does that mean if you have 2 of those (the max allowed in one configuration) then can you have up to 512GB of RAM? Also, does that mean you can have two quad-channel RAM configurations (one for each CPU) if your board allows it?

Thanks, Physics

P.S. Please don't say something like, "Oh, you don't need that much RAM," or anything like that. I came here for one reason: to get an answer, not advice. So if you are going to reply with that, please save it for someone actually asking for it and stop wasting your time.
 
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In short it all depends on motherboard as it depends on CPU.
If you got motherboard with for example 2 or 4 sockets for CPU. There may be lot of ram slots. Each of these slots will be connected to specific CPU and these CPU will communicate through something called QPI which will allow them to access memory of another CPU and take data of it.
I'm not sure if it's possible to connect 1 memory module to 2 cpus at once as I guess it could cause problems if 2 cpus would try to...
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Tiger Minecraft

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Windows 8 can support 512GB RAM, and IDK a mobo that has 8 channels, but for now, let's make both of those variables theoretical. Just say that both can support infinite.
 
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pm4

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Apr 28, 2014
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In short it all depends on motherboard as it depends on CPU.
If you got motherboard with for example 2 or 4 sockets for CPU. There may be lot of ram slots. Each of these slots will be connected to specific CPU and these CPU will communicate through something called QPI which will allow them to access memory of another CPU and take data of it.
I'm not sure if it's possible to connect 1 memory module to 2 cpus at once as I guess it could cause problems if 2 cpus would try to control that ram module. That is what was QPI made for.

For example there are intel server boards with 48 ram slots and 4 cpu sockets with support up to 1,5TB of memory. Which you can saturate if you get 32gb ram into each slot but that would already go beyond limit of CPU you posted.
I'm not sure what would happen if you would populate all 48 slots and use only one CPU, I bet 36 of those slots wont be usable without CPU to which it should be connected.

So to answer initial question. Yes each Xeon cpu can have it's own 256 GB memory provided you use right motherboard.
 
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