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What difference does hardware encoding make?
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Yeah, memory bandwidth helps, but more importanly the system's memory acccess latency goes down with the number of channels used to access it.

I have 64GB in my system now, not because I needed that much memory, but because I wanted 4+4 channels (each CPU has a Quad controller) to access my DDR3 memory (T7610 here, with two E5-2667 V2). So I have installed 8 sticks of 8 MB in my machine (of 16 slots total), 4 sticks for each CPU (to use their Quad channels)

Sure it's not a linear dependency, due to other bottlenecks (like the L3 level CPU, or the two QPI links, or PCI-Express 3.0 latency moving data between CPU and GPU).

PS: You really need to check the recommended Dell fill for your memory slots, especially in your case with un-equal sticks. Best way to go is to fill all slots equaly.
One of your CPU's has memory in Dual channel, the other in Quad. There will be times when the Quad ch CPU will wait for a result that is in the Dual ch CPU memory.

This message was edited 7 times. Last update was at Mar 23. 2020 09:12

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JeffK.Boston [Avatar]
Newbie Private Message Joined: Sep 14, 2010 05:40 Messages: 24 Offline
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I have 64GB in my system now, not because I needed that much memory, but because I wanted 4+4 channels (each CPU has a Quad controller) to access my DDR3 memory (T7610 here, with two E5-2667 V2). So I have installed 8 sticks of 8 MB in my machine (of 16 slots total), 4 sticks for each CPU (to use their Quad channels)


Thanks I would have never thought of that. I had four 16GB RDIMMs sitting on the shelf which is why I ended up with 128GB total - I don't need that much memory. I shall experiment - I will borrow some memory from another workstation and play around...
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Thanks I would have never thought of that. I had four 16GB RDIMMs sitting on the shelf which is why I ended up with 128GB total - I don't need that much memory. I shall experiment - I will borrow some memory from another workstation and play around...


Yeah, I don't "need" 64GB either, but I wanted to have Quad channel used on each CPU for latency and bandwidth.
My CPU has a max mem BW of 59.7 GB/s, but that's only in Quad channel mode.
Your CPU, since it has DDR4 controller, has a max mem BW of 68 GB/s... but again only in Quad mode. In Dual channel mode it halfs that.
CPU-Z is a good little software that can show various CPU-related things, including the mode of connected memory.

LE: Comparation between E5-2667 V2 and V3:

https://ark.intel.com/content/www/us/en/ark/compare.html?productIds=75273,83361

[Thumb - comparation.PNG]
 Filename
comparation.PNG
[Disk]
 Description
E5-2667 comp
 Filesize
113 Kbytes
 Downloaded:
1 time(s)

This message was edited 6 times. Last update was at Mar 23. 2020 10:11

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