The issue looks to be that you are hitting the max in memory using the dimms you have. If you are willing to swap out ALL the dimms to RDIMMS or LDIMMs, then you can go to a max 512GB (RDIMMS), or 768GB (Ldimms) on some servers. It depends on the exact servers being used. If you let me know the servers then I can tell you what they can go to in memory.
To answer your question about RAM speed affecting performance. Most setups don't notice much of a difference between 1066, 1333 or 1600MHz memory. Benchmarks will show differences, but in real life the difference is much less noticeable.
If you're adding memory and aren't using all available memory channels (3 per CPU for 11th gen servers, and 4 for most 12th gen servers), I would recommend to add memory in such a fashion to use all memory channels.
It is also important to properly populate your memory in your server.
To help figure out how to populate the memory, check out this site: http://poweredgecpumemory.com/. It lets you pick your server, the memory quantity you want and show you some of the dimm population options.
I have a Precision T7500 and I'm trying to spec out memory for an ESXi server. I was on chat with Dell Support yesterday and they didn't seem to understand what I was asking. The machine is advertised as being able to utilize up to 192GB and the speed tops out at 12800. I want to get to at least 96, or 128. Either will work. I want to do it without down throttling the speed to 800 Mhz. Is this possible? If so can you tell me how or direct me to someone who can?
The technical specs say that 16GB 4R DIMM's will operate at 800MHz, which makes it a question of whether it is the size that forces the speed throttling or the rank. If it is the size, then the statement that configurations over 72GB will run at 800MHz will hold true. If it is because of the ranks, you "might" be able to find 2R 16GB DIMM's and get them to run at 1066 or even 1333, but even then it is probably unlikely.
Ultimately, this is either a limitation of the board (possibly addressed at some point by a BIOS update) or a limitation of the processor's memory controller. So, I would make sure your BIOS is up to date, but there is a better than average chance you will not get the memory to run faster than 800MHz at those capacities.
DELL-Chris H
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August 8th, 2013 09:00
Benwaynet,
The issue looks to be that you are hitting the max in memory using the dimms you have. If you are willing to swap out ALL the dimms to RDIMMS or LDIMMs, then you can go to a max 512GB (RDIMMS), or 768GB (Ldimms) on some servers. It depends on the exact servers being used. If you let me know the servers then I can tell you what they can go to in memory.
Dev Mgr
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August 9th, 2013 09:00
To answer your question about RAM speed affecting performance. Most setups don't notice much of a difference between 1066, 1333 or 1600MHz memory. Benchmarks will show differences, but in real life the difference is much less noticeable.
If you're adding memory and aren't using all available memory channels (3 per CPU for 11th gen servers, and 4 for most 12th gen servers), I would recommend to add memory in such a fashion to use all memory channels.
It is also important to properly populate your memory in your server.
To help figure out how to populate the memory, check out this site: http://poweredgecpumemory.com/. It lets you pick your server, the memory quantity you want and show you some of the dimm population options.
Ryan Scruggs
1 Message
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January 22nd, 2016 05:00
Chris,
I have a Precision T7500 and I'm trying to spec out memory for an ESXi server. I was on chat with Dell Support yesterday and they didn't seem to understand what I was asking. The machine is advertised as being able to utilize up to 192GB and the speed tops out at 12800. I want to get to at least 96, or 128. Either will work. I want to do it without down throttling the speed to 800 Mhz. Is this possible? If so can you tell me how or direct me to someone who can?
Respectfully,
Ryan Scruggs
theflash1932
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16.3K Posts
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January 22nd, 2016 09:00
The technical specs say that 16GB 4R DIMM's will operate at 800MHz, which makes it a question of whether it is the size that forces the speed throttling or the rank. If it is the size, then the statement that configurations over 72GB will run at 800MHz will hold true. If it is because of the ranks, you "might" be able to find 2R 16GB DIMM's and get them to run at 1066 or even 1333, but even then it is probably unlikely.
Ultimately, this is either a limitation of the board (possibly addressed at some point by a BIOS update) or a limitation of the processor's memory controller. So, I would make sure your BIOS is up to date, but there is a better than average chance you will not get the memory to run faster than 800MHz at those capacities.