Technical RAM challenge

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ffried78

Commendable
Jul 9, 2016
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Hey All,

So here is a technical challenge that has me particularly baffled to say the least, would be interested to see if anyone has any insights.

I have an HP z420 workstation which I was planning on upgrading from 8Gb to 24Gb. I've tried 3 different types of RAMs and each time they don't work.The first two types had different speed and different CAS latency so I understand why it wouldn't be compatibility, but this time I matched every criteria I could find.

Current RAM PC3-12800 1600mhz CL11 (Hynix HMT32U7CFR8C-PB to AE)

Latest RAM brought PC12800 1600mhz CL11 (UMOX)

Interested to hear what you experts have to say about this.

EDIT: Picture of the DIMMs without ram

view


https://drive.google.com/file/d/0ByYqoSxe29qtZzdCaXlYNmdlRFU/view?usp=sharing



 
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weberdarren97

Glorious
Aug 10, 2015
8,137
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Try each DIMM one at a time. Try each DIMM slot on the motherboard. If they all work by themselves, then it may be that they're not compatible.

Can you post a picture of the DIMM slots on your motherboard without any DIMMs in them? That would make it a lot easier for me to identify whether your motherboard has multiple channels for memory or not.
 
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das_stig

das_stig

Glorious
Jul 24, 2009
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The Z420 (Z620, Z820) have 4 memory channels per CPU, and each channel has 2 DIMM sockets: one black, and one white. Maximum performance is achieved when there is identical memory modules are installed in each channel, because memory can be accessed on all channels at the same time (OK, that is a very oversimplification).

To get the highest performance, install 4 of the same type of memory modules in each channel (put one in each black DIMM socket).

If one wants more memory, then put 4 identical modules in the white DIMM sockets.

Dual rank memory modules can typically give 15% to 20% more performance than single rank memory.

There are exceptions to this, but these are general memory population rules.

Workstation memory is ECC, and most are registered memory. These added chips increase memory cost.
 
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weberdarren97

Glorious
Aug 10, 2015
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Well when us users are working on several posts at a time, it's easy to get the details confused with one another.

Anyways, please post an image of the motherboard DIMM slots while not populated.

Upload your image to an image hosting site like Google Drive or Imgur and copy paste the link into the reply box. If using Google Drive, make sure Link Sharing is turned on.
 
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ffried78

Commendable
Jul 9, 2016
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1,510


Thanks for the tip! Heres the link: https://drive.google.com/file/d/0ByYqoSxe29qtZzdCaXlYNmdlRFU/view?usp=sharing
 
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ffried78

Commendable
Jul 9, 2016
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I have tried the new Ram on it's own and the pc wont boot. What other criteria or specification could be different to the original RAM that is prohibiting its function?
 
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ffried78

Commendable
Jul 9, 2016
7
0
1,510


There is no model number on the new one, the old one is mentionned on the post.

I have just noticed the old one is low voltage and the new one does not mention voltage. Could this be the culprit? or any other variable to consider?
 
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