The best thing to do is to look at the RAM stick in the Predator and buy the same.
If it's a standard motherboard (not custom for Predator) you can probably find a table of supported RAM sticks online.
Normally it is DIMM288 in desktop format. and 3200 supports both intel and amd. but with intel you could usually go higher. Here, too, you would have to read the manual of the CPU.