Memory installation

I would like to ask a follow-on question: When I order the memory modules, should I also buy a kit in order to install the memory on my iMac? Also, since my iMac can work with up to 64 GB of memory, would it be better to leave the two factory-installed modules (with 4GB apiece) and install two 16 GB memory modules?

The reason why I want to do this is that I like to keep a lot of windows open at once and I am running some programs that I think are resource hogs (such as Dropbox, EndNote, and Adobe Acrobat Reader DC, Microsoft Word, and Microsoft PowerPoint). With everything open, I often receive the running out of memory notice.

Apple says I need to make sure the Small Outline Dual Inline Memory Modules (SO-DIMM) meet all of these criteria:

• PC3-14900
• Unbuffered
• Nonparity
• 204-pin
• 1867MHz DDR3 SDRAM

How can I make sure the modules I am buying meet all of these criteria?

I was only now able to carve out some time to install the new OWC memory modules that arrived several days ago. But, I was having some problems. The notch for the memory modules in my computer is on the left-hand side. So, I thought Macsales.com sent me the wrong memory modules. I called them and told them the problem, and the nice guy who spoke to me told me to turn the memory modules around and see if the notches lined up. They did line up. Then, he told me to put the original Apple memory module in one of the 4 module "stair steps" (my term) and alternate them with the new OWC memory. I did so, and my computer started right up with no problem. But, I am worried since I left the OWC stickers on the memory modules; will this cause a problem?

Thank you very much. I had already planned to buy it from Crucial; I am glad to hear that it is a good source.

Wait, scratch my comment above. I was looking at the wrong area for information.

I need:

• PC4-2400 (19200)
• Unbuffered
• Nonparity
• 260-pin
• 2400MHz DDR4 SDRAM

Thanks. I will do that.

I think it is much faster.