What type of memory

My daughter has a desktop computer and she needs more memory to run some of her applications. I've checked it out as best as I know how but all I can come up with is that the memory in it is 8 GB of ADATA XPG memory, and she has on empty slot. I googled the memory and I think I found it but it comes in two options, 8GB 3200Mhz & 8GB 3600Mhz, and I don't know which to get or if it matters.

Her computer is a: Cyber Power PC, product id: DC6115BB-FC14-4923-BAE9-F7455B8D1219, device id: DC6115BB-FC14-4923-BAE9-F7455B8D1219

Any ideas? Thanks.