Can I use different sticks of RAM?

Question

Iron

I bought a PC from my hands, there is one RAM bar in width that is noticeably larger. In terms of speed, both 1333 and 4Gb, Core i7 2600 percent.
Am I losing something in speed in this situation? How to check?
https://habrastorage.org/files/88a/7e3/5d9/88a7e35...
https://habrastorage.org/files/a39/416/a68/a39416a...
https://habrastorage.org/files/ 122/d30/0b2/122d300...
https://habrastorage.org/files/833/d07/d5e/833d07d...
https://habrastorage.org/files/bd1/902/a45/bd1902a...

Answer 1

By width? Maybe in height? Physically? One plate is just Low-profile, that means. If the parameters are the same (frequency, size, preferably timings), then everything should be fine.