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Go to SolutionHello igmac
With 8x4GB and 4x8GB modules available the maximum configuration would be this:
A1/B1: 8GB
A2/B2: 8GB
A4/B4: 4GB
A5/B5: 4GBAvailable memory will be 48GB unless my math isn't working this morning. If you had 2 more 8GB DIMMs then you could populate the third slot on each side; excluding limitation on quad rank and other restrictions on using the third slot.
Thanks
Thank you for that Daniel.
We just finished upgrading the 2 servers with the memory as given above a few minutes ago. I tested the various possible memory configurations, and can confirm that your answer above works perfectly.
I couldn't find where to 'accept' your answer and to mark the question as answered though. Could you possibly do that? Keep the forum nice and tidy :-)
In the end, because we had 2 servers, both with 4 x 4g x 2 processor banks (8 x 4g in total) per server, I configured one server with 4 x 8g per processor bank (64g total) and set it to Advanced ECC mode (8g's were in slots 2,5,3,6 with 1,4 empty as per manual).
For the 2nd server we used the spare memory modules and put 4g modules into every slot, giving 48G. This one was configured in Optimizer mode, again as per manual.
FYI, I also tested with:
A1/B1: 8G
A4/B4: 4G
A2/B2: 8G
A5/B5: 4G
This you told us would work and we confirmed it - and then also added:
A3/B3: 4G
A6/B6: 4G
You said it would work on 8G/8G, not with 4G/4G but we tried it anyway. This actually did work, BUT was flagged as an "Unsupported Memory Configuration" and gave the "F1 to continue" message. I assume that the memory in this configuration would have been in a very low performance mode or something like that. I suppose that in a pinch you might be able to use it like this (home server anyone?), probably by disabling the "F1 to continue" option in the BIOS.
Thank you very much for your assistance.
Regards,
Ian.
I've got an almost identical situation, where we have existing 4G x 8 modules on two processors.
We're wanting to install another 8g x 4 modules to max out the memory sockets.
From what you write above, you say we would not be able to populate the 3rd channel and would have to remove those 4g modules from A3, A6 and B3, B6 and instead of going from 32G to 64G we would only get it up to 48G max by mixing 8g and 4g memory modules? Ours is a R160 btw.
We've already noted that the system will have to move from Advanced ECC mode into Optimizer mode.
On the same line of questions:
We have a R610 with 6 x 2GB for a total of 12GB. If I need to double the RAM to 24GB, here are my options:
1. Add 6 x 2GB
2. Add 3 x 4GB (I'm not sure this will work)
3. Replace all 2GB with 6 x 4GB
Or are there other options I can consider.
Thanks
Hello i-jen
1. Add 6 x 2GB If you have two processors(Which I'm guessing you do or you would not have 6 available slots) then yes this will work.
2. Add 3 x 4GB (I'm not sure this will work) This will not work in a 2 CPU configuration. Each lane(A lane and B lane) must have an identical memory configuration. There is not a way to split 3 DIMMs evenly across the two lanes. You would need to add 6. Our 11th generation servers do not allow flexible memory configurations, so if you have 3 DIMMs populated in bank 1(slots 1-3) then you can only populate bank 2(slots 4-6) with 0 or 3 DIMMs. You would not be able to populate 1 or 2 DIMMs in those banks. Aside from that you would also need to match the B side(Lane 2) with the same DIMM configuration.
3. Replace all 2GB with 6 x 4GB Yes, that should work as well.
Thanks
I ended up purchasing 4 additional RDIMM of 8GB each thinking just swapping out the 2GB sticks and replace with 8GBs. However, after speaking to tech support, I was told there shouldn't be a problem mixing the two.
In Advanced ECC mode, I could put the 8GB in slots A2/B2 & A3/B3 and 2GB in A5/B5 & A6/B6.
In Optimized mode, which should be the default when the server was shipped, I can have the 2GB in A1/B1, A2/B2 & A3/B3 and 8GB in A4/B4 & A5/B5. This will yield 44GB total, a good addition for a server running SBS2011.
Thanks
In Optimized mode, which should be the default when the server was shipped, I can have the 2GB in A1/B1, A2/B2 & A3/B3 and 8GB in A4/B4 & A5/B5. This will yield 44GB total, a good addition for a server running SBS2011. That memory configuration should not work. Have you tested this?
Flexible memory configurations are allowed in our 12th generation servers. You will get a message that the configuration is not optimal, but it will work. In previous generations, like the R610, it will give an unsupported configuration error and disable the DIMMs in slots 4,5.:
1-3: 3x2GB DIMMs
4,5: 8GB DIMMsFor this configuration to work you will need two more 8GB DIMMs, so that the two banks have the same number of DIMMs populated. Also, for best results you want to populate larger DIMMs first, so you would put the 8GB DIMMs in 1-3 and the 2GB DIMMs in 4-6.
Thanks
Daniel My
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Posted September 21st, 2012 15:00
Hello Mike
I wouldn't say it is recommended, but it will work. The only problem with mixing memory is that you will not be able to populate the third channel. It will make slots A3,A6 - B3,B6 unusable.
I would populate it something like this:
8GB - A1,A2,B1,B2
4GB - A4,A5,B4,B5
I can't think of a way off the top of my head to hit 40GB. If you are only running a single proc then you would populate it like this:
8GB - A1,A2
4GB - A4,A5
If there are any questions let me know.
Thanks