@billybob62
We don't know which exact CPU you have but if you switch to 2400 ram the gains will be minimal if any, and only in applications that heavily utilize the CPU and RAM, but the negatives will be felt if you indeed use anything near 7GB+ at peeks and that becomes more true, the older CPU is. On the other hand, if you keep your needs below 7 GB, I don't see any issues but no real benefits either.
I agree with
@fantom and In most cases, using the 1600 16GB ram will be better than 2400 8GB, Especially if you use many applications and/or open several tabs on the browser. Keep in mind It's not clear if you have 2 sticks of 4GB or 1 of 8GB but if it's 1 of 8GB, you will force the CPU into single channel mode, which will make things even worse.
If you worry about games, note that if you are GPU bound, ram speed will have minimal effects, if you are CPU bound, you may see some increase but only in few games that again use the CPU more.
If you have both RAMs, feel free to test the validity of what we say to see for yourself. Do whatever you do every day with either and see if and when the PC slows down.
@billybob62 instead use vram to make changes, if and where required.
If by Vram, you mean Virtual memory (swap), what changes are there to be made that are related to what the user is requesting? really asking.
It is known I assume, that its best to avoid using Virtual memory to make up for RAM at all costs, especially if one is using spinning rusts (normal hard disks), with the slight exception of people that have semi-fast NVMEs or fast SSDs but overall it's better not to force the use of Swap over RAM if possible.
