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BigDigital
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Memory configuration issue

HP Recommended
Z840 Workstation
Microsoft Windows 10 (64-bit)

I'm seeing a warning that my memory is not configured properly.  I have two CPU's and 3 8GB memory chips.  Do I need to have an even number of memory chips to maximize performance?  Or, do I have the third chip in the wrong slot?  I added the 3rd one myself thinking I followed the diagram on the inside panel of the case for memory placement.  I put it in the spot it has labeled as the #3 slot.  See photos.

 

My second quesiton is how to set up the machine for "high performance"  I thought I did so in windows but it keeps going back to some default setting.

 

 

 

HP 3.PNG

 

HP 4.PNG

 

 

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banhien
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94,961 88,217 12,302 26,147
Message 2 of 3
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@BigDigital

 

I think using 3 x 8GB = 24GB is not recommented/supported:

 

Types of memory supported on an HP Z840 are:

  • 4 GB, 8 GB, 16 GB, and 32 GB PC4-2400R 2400 MHz DDR4 Registered DIMMs supported on Intel® Broadwell (v4) processors
  • 4 GB, 8 GB, and 16 GB PC4-2133R MHz DDR4 Registered DIMMs supported on Intel® Haswell (v3) processors
  • 64 GB and 128 GB PC4-2400 2400 MHz DDR4 LR DIMMs supported on Intel® Broadwell (v4) processors
  • 32 GB, 64 GB, and 128 GB PC4-2133R 2133 MHz LR DIMMs supported on Intel® Haswell (v3) processors
  • Single and dual rank 4 GB and 8 GB based DIMMs are supported
  • Quad and octal rank 4 GB and 8 GB based LR DIMMs are supported

More indormation (p 22):

 

    http://h20195.www2.hp.com/v2/getpdf.aspx/4aa5-4045enw.pdf

 

Regards.

BH
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banhien
Level 19
Level 19
94,961 88,217 12,302 26,147
Message 2 of 3
Flag Post
HP Recommended

@BigDigital

 

I think using 3 x 8GB = 24GB is not recommented/supported:

 

Types of memory supported on an HP Z840 are:

  • 4 GB, 8 GB, 16 GB, and 32 GB PC4-2400R 2400 MHz DDR4 Registered DIMMs supported on Intel® Broadwell (v4) processors
  • 4 GB, 8 GB, and 16 GB PC4-2133R MHz DDR4 Registered DIMMs supported on Intel® Haswell (v3) processors
  • 64 GB and 128 GB PC4-2400 2400 MHz DDR4 LR DIMMs supported on Intel® Broadwell (v4) processors
  • 32 GB, 64 GB, and 128 GB PC4-2133R 2133 MHz LR DIMMs supported on Intel® Haswell (v3) processors
  • Single and dual rank 4 GB and 8 GB based DIMMs are supported
  • Quad and octal rank 4 GB and 8 GB based LR DIMMs are supported

More indormation (p 22):

 

    http://h20195.www2.hp.com/v2/getpdf.aspx/4aa5-4045enw.pdf

 

Regards.

BH
***
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.




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BigDigital
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Thanks, it would seem that you would desire even numbered dimms.  Page 24 shows the best configurations.  I’m wondering if removing the 3rd memory stick might be better than leaving it.  Alternatively, I could spend more money and buy another 8gb.  

 

I purchased “hp” memory stick, but it’s really Samsung with an hp sticker on it!  So maybe I can just buy a Samsung for less.

 

when I purchased the workstation from the dealer, it said the memory was 2400mhz, so I purchased the extra 2400.  However, the preinstalled 2x8gb sticks are 1866mhz!  I have not heard back from my dealer yet why the memory speed is not as advertised.  Does it really make much a performance difference though?

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