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Question INSTALL SSD PCIe TO UPGRADE MY DESKTOP

Another Question: the Desktop have a two slot for DDR-4 3200 memory ram. One of the slot have 8 GB of Memory RAM preinstalled. Another slot is free. I wonder if is possible to install 16 GB of Memory RAM in available slot. Or the both a slot have to be same amount of memory and I only can upgrade with equal memory RAM that was preinstalled, that is 8 GB.
 
You can install a 16GB for a total of 24GB. The performance won't be quite as optimal as 2x16 or 2x8 but, it will work just fine. A lot of people run into a similar issue with PC's that have a soldered RAM module and an open slot.
 
Although I realized is that I should not opt for the 16 GB RAM which, despite totaling the 24 GB (16+8), is not as effective as the total of 16 GB (8+8). It sounds strange, but that's exactly how I realized it, isn't it?
 
It's not going to affect anything in a huge manner.

Personally ram is cheap for 32gb under $100 and I would just upgrade the pair at the same time.
 
Although I realized is that I should not opt for the 16 GB RAM which, despite totaling the 24 GB (16+8), is not as effective as the total of 16 GB (8+8). It sounds strange, but that's exactly how I realized it, isn't it?

Not at all strange. If you have your RAM installed in the motherboard correctly and paired up, 2 sticks can indeed run faster than 4. Mixing pairs of RAM of different speeds will cause the faster RAM to default to the slower speed.
 
I installed the PCIe SSD 2TB NVMe M.2 Disk with the PCIe adapter 4x in the Mainboard PCIe 16x slot.
I deleted the partition of the 128 GB SSD disk preinstalled where the original OS was and installed the OS on the new SSD disk.
However, on startup after the LENOVO logo appears, the screen displays the following message:

">>Checking Media Presence......
>>Media Present....."

This happens when the Ethernet network cable is disconnected. When I turn on the network cable a third message line appears:
" Start PXE over IPv4 on MAC: 1C-69-7A-C3-79-D6"
This time the PC only starts after I press 4 times on the key "ESC"

I updated the firmware of the BIOS and the problem remains.
What should I do to resolve this issue?
 
It might not be possible to boot the 2TB drive while it's in a pci-e x16 slot. you might want to use the m.2 slot for the boot drive and the pci-e slot as a secondary drive.

As the lenovo uses a custom motherboard, it's not easy to find out whether it's actually possible to boot from the pci-e slot.
Lenovo's site lists the board as a Lenovo BDPLANAR AMD Vermeer Pro 565 with model number AM4P19ME
 
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Lenovo has a nifty BIOS simulator under How To's >>> BIOS/UEFI.

So it shows that there's Other Device in Boot Sequence. Move Other Device to top with +/- keys, Save and Exit.

If that doesn't boot from the 2TB SSD, take out the old SSD from M2 slot and put the 2 TB one there and then move your old M2 to the NVMe adapter in the PCIe 16x slot. Go back to BIOS and move M2 back to very top in Boot Sequence. It should boot from 2TB now.
 
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