Correct RAM for upgrade from base 8gb on new ENVY 795-0007na PC

[chrislongshot]

I ordered the new ENVY 795-0007na PC which has a standard 8Gb RAM. At the same time I ordered 2 x Kingston - DDR4 - 8 GB - DIMM 288-pin - 2666 MHz / PC4-21300 - CL19 - 1.2 V. RAM sticks..….which appeared to be the correct spec......however both sticks cause beeps and no boot. This happens even when one only is installed and factory stick removed.

Seems odd that both sticks would be faulty.  

The factory RAM is definitely 2666 according to the Bios, and that is what HP list against the PC. SK Hynix shows up in HP diagnostic tool as the maker

1. Is there're something I am missing in terms of spec which I should be looking for ? (https://support.hp.com/gb-en/document/c06069007 is the HP spec link for the PC)

2. should those Kingston sticks work OK? (ie are they likely to both be faulty)

3. assuming faulty and I replace them is  buying 2 x 8gb a bad idea and would this  really mean throwing the existing 8gb Hynix away since I haven't got matching pairs....(I would like 16-32gb RAM or anywhere in-between, was originally hoping that I might end up with 24Gb) 

I am not very experienced at all with RAM as you will note - but I am sure that I  have put them in correctly and the original stick works fine after trying various options and putting that one back the way is was from the factory. 

Hope somebody can help

Thanks

[Paul_Tikkanen]

Hi:

I agree that it would be very unlikely that both memory modules are defective.

Can you post the info off the label on the memory or from the Kingston website?

It has to be non-ECC, unbuffered, low density, and it should have the same timing specs as the one that came with your PC.

Timing specs/density may not be advertised on the memory label.

I have zipped up and attached a free utility below, that will show you all the memory info regarding the memory module that originally came with your PC.

[chrislongshot]

Thanks so much for showing interest 

Brill -  your tool shows the RAM as SK Hynix HMA81GU6CJR8N-VK with a spec ofDDR4-2666 / PC4-21300 DDR4 SDRAM UDIMM

utility also says 'single channel' and clock of 1333

this does have N against the ECC

The RAM I bought is KTD-PE426S8/8G (off the box lid)

Many thanks

[Paul_Tikkanen · Accepted solution]

You're very welcome.

You bought the wrong memory type for your PC.

You bought server memory, which is ECC.

https://www.memory4less.com/kingston-8gb-ddr4-pc21300-ktd-pe426s8-8g?rid=14&msclkid=d281a02df95f1e78...

This memory should work for you...

https://www.crucial.com/usa/en/ct8g4dfs8266

You can get it on amazon UK.

https://www.amazon.co.uk/Crucial-CT8G4DFS8266-PC4-21300-288-Pin-Memory/dp/B0734V4SSR/ref=sr_1_1?keyw...

[chrislongshot]

Thank you very much for that....a mine field.

Out of interest is there something on the HP spec which indicates the nonECC status so that I should have known to watch out for it ?

Finally ...Do you think if i buy 3 of the RAMsticks you suggest they should work ok with the factory chip?

Regards & thanks

[Paul_Tikkanen]

You're very welcome.

The specs on your PC's support page don't mention the non-ECC spec like they usually do, but they do mention the unbuffered spec, and all non-ECC memory is unbuffered, and all ECC memory as far as I know, is buffered.

https://support.hp.com/gb-en/document/c06069007

This detail would not have been easy for you to catch, but I can guarantee you the memory you bought won't work in any home PC.

Once bit, twice shy as the old saying goes, so if this happened to me, I would take a two-step approach.

By the one 8 GB memory module.  Pair it with the original one. 

I looked at the picture of the motherboard, and normally, you put the memory in every other slot, when you don't have 4 sticks, but I see that yours has two black slots and two blue slots.

I assume you put the other memory chip in the same colored slot the original one is in.

If it works, then buy the other two to complete your memory upgrade project.

You want to install the memory in matched capacities so it runs in the better performing DDR (dual data rate) mode.

With only one memory module installed, your PC is running in the lower performing SDR (single data rate) mode.

Please post back and let us know how your PC memory upgrade went on the second go-around.

[chrislongshot]

Thanks - you have been brilliant - will post feedback as chat

regards

[Paul_Tikkanen]

Anytime.

Glad to have been of assistance.