Memory configuration issue

[BigDigital]

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.

[banhien · Accepted solution]

@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.

[BigDigital]

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?