If people had their way, as long as a memory module would fit onto the motherboard slot, they would install them. But wait. Memory modules also have their proper classifications as well. This dates back to the type of memory modules that are acceptable.
We look back at the Pentium III or IV. If you will recall, they had these tags of either a PC 100 or PC 133. To this day we see them still and one thing you will note, memory modules of a different kind do not work well together. You will notice this if you dare try. Other than seeing your operating system not loading properly, you will get tons of blue screens which will point to numbers which you may try to figure out.
While you are busy trying to determine which hardware component this may be, take out one of the memory modules and see if the blue screen will go away. If it does, then you are trying to do something that will be constantly giving you headaches.
At times when you may not even know which is the proper ram module to use, it would be best to try them one at a time. Module compatibility also depends on how the motherboard will accommodate them. After you have determined which specific module type is acceptable, then that is perhaps the best way to stick to the brand that suits your PC.
Testing memory modules will not really hurt your PC immediately. But if you are wise and cautious, it would be best to stick to the actual PC specs given and avoid experimenting for the proper well-being of your PC.