Confused about upgrading ram

[howtoupgraderam]

Hello. Recently i bought a pre-built pc from a local computer shop. So far it's running great but
I'd like to install more ram in it (currently have 1x8, wanna 2x8). I've done some research about adding ram and I've learned that the only way to ensure compability between ram sticks is to buy them in kits. However (since my mobo only has 2 DIMM slots) to do that I would have to take out my current Ram and I wasn't sure if I was allowed to take out components out of the computer without voiding my warranty so I contacted the shop and asked them about it.

They said that (in case of my pc) in order to upgrade my ram it isn't necessary to take out any components, I can just buy an additional Ram stick and simply install it into the free DIMM slot. They said that it wouldn't require changing anything in the BIOS. They sent me a link to a compatible Ram stick, identical to the one they installed in my pc (Crucial CT8G4DFD8213).

However, one thing is bugging me. I have downloaded CPU-Z to check the components in my computer and according to the program the ram stick currently installed in my pc (Crucial CT8G4DFS8213.C8FBD) is different from the one they sent me a link to. This is what confuses me about this whole thing. Is it possible that CPU-Z is reading ram incorrectly?

What do you think? Should I trust the shop and order their recommended ram stick? What is the worst thing that installing this module can do to my pc? Also, do I have to get a more powerful PSU to install another Ram stick?

My pc's components:
MOBO Msi H110M Pro-VD (2 DIMM slots)
CPU Intel Core i5 7400
GPU MSI Geforce GTX 1060 3GB
PSU Kolink kl c500 500W
RAM Crucial CT8G4DFS8213 (or CT8G4DFD8213)

CPU-Z memory tab http://

 

[kaptainkuftic]

First, thank you for doing some research beforehand. It helps us address the problem better.

Now onto the questions. As you pointed out, yes, RAM is meant to be a kit. That's the only way to guarantee that the sticks work together. If you can't kit, you want the same make/model. If you can't find that, you need to make sure the modules are at least the same speed and timings. If you can't find that, just buy a new kit.

CPU-z probably isn't wrong, what is the RAM that the shop is showing you?

Adding that extra module won't break your PC. You're fine to add it, and it'll probably work just fine. If it doesn't just remove the new module and you're back to where you started.

I've never heard of that PSU before, and I can't find much about it. So I don't trust it all that much, but that's up to you. Here's a link to a good and cheap PSU that is by far more reputable https://www.newegg.com/Product/Product.aspx?Item=N82E16817151094

If I missed any of your concerns, I apologize. Just let me know what they were and I'll address them

 

[howtoupgraderam]

Thank you for answering. Now, onto your questions.
The Ram that's installed in my pc according to CPU-Z seems to be http://www.crucial.com/usa/en/ct8g4dfs8213
The Ram installed in my pc according to the shop http://www.crucial.com/usa/en/ct8g4dfd8213
The only difference between them that i have found is that the first one is single rank and the other is dual rank. I don't know what that means though.
Let me also clear up the concerns about the PSU. I wanted to know if (in general) 2 Ram sticks require significantly more power from the PSU than 1 Ram stick.

 

[kaptainkuftic]

Sparing the details of what rank refers to, because I don't grasp it all that well, more rank = better. It shouldn't make a difference though, if you pair them together that way. Both modules are of the same speed and timing, and both are from Crucial. While there are no guarantees, you'll probably be fine.

No, adding one more stick of RAM will not significantly impact your overall wattage. What I'm concerned with, in regards to the PSU, is its overall build quality. The one I linked is very good, and the one you have is sort of unknown.