RESOLVED (to my satisfaction) by installing an extra 4 sticks of RAM, making 64Gb in total.
HWINFO32 now reports Quad channel, instead of dual channel.
It seems that, for full quad channel operation (ie, at the local as well as the remote level in a NUMA system), each CPU must have access to its own set of four channels of RAM.
The architecture can only be used when all four, or a multiple of four, memory modules are identical in capacity and speed, and are placed in quad-channel slots. When two memory modules are installed, the architecture will operate in dual-channel mode. When three memory modules are installed, the architecture will operate in triple-channel mode.
NOTE: Memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance.
Refer the below picture for memory configuration:
NOTE:
Table above show all configurations are ECC RDIMM.
* Configurations required load-reduced memory and are 1333MHz speed only.
NOTE: The total amount of available memory will be less than 4GB. The amount less depends on the actual system configuration. To fully utilize 4GB or more of memory requires a 64-bit enabled processor and 64-bit operating system.
000tim000
8 Posts
1
May 31st, 2013 07:00
RESOLVED (to my satisfaction) by installing an extra 4 sticks of RAM, making 64Gb in total.
HWINFO32 now reports Quad channel, instead of dual channel.
It seems that, for full quad channel operation (ie, at the local as well as the remote level in a NUMA system), each CPU must have access to its own set of four channels of RAM.
Tim
Dell-Rajesh R
4 Operator
•
3.3K Posts
0
May 29th, 2013 04:00
Hi Tim,
The architecture can only be used when all four, or a multiple of four, memory modules are identical in capacity and speed, and are placed in quad-channel slots. When two memory modules are installed, the architecture will operate in dual-channel mode. When three memory modules are installed, the architecture will operate in triple-channel mode.
NOTE: Memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance.
Refer the below picture for memory configuration:
NOTE:
Table above show all configurations are ECC RDIMM.
* Configurations required load-reduced memory and are 1333MHz speed only.
NOTE: The total amount of available memory will be less than 4GB. The amount less depends on the actual system configuration. To fully utilize 4GB or more of memory requires a 64-bit enabled processor and 64-bit operating system.
Awaiting your response!
000tim000
8 Posts
0
May 29th, 2013 04:00
Thanks for your reply.
Your chart shows 2 different ways of configuring the PC for 32Gb RAM.
Method A is to populate a total of 4 slots with 8Gb RAM sticks.
Method B is to populate a total of 8 slots with 4Gb RAM sticks.
My PC uses Method A.
My question is this: given that I have two CPUs, does Method A deliver quad channel performance? Or should I use Method B?
Regards,
Tim