Question ReadyBoost and laptop upgrades

[Pupq1]

I've been looking for ways to upgrade my non-serviceable laptop and the first thing i found was ReadyBoost
Now, my question is, is the flash drive's memory used as RAM or just faster storage?
I'm asking cause I also wanna get an external SSD and someone said that it doesn't make sense to use both SSD and ReadyBoost. So should I just use them both?
Also, I only have one usb 3.0, should I also get a spliter to plug both the flash and ssd? Would that affect speeds?

 

[k1114]

It's disk caching that's why it would slow things down because a ssd is faster than usb. Windows already caches to ram so if you have enough ram then it will just slow down the laptop even more.

 

[Pupq1]

It's disk caching that's why it would slow things down because a ssd is faster than usb. Windows already caches to ram so if you have enough ram then it will just slow down the laptop even more.

I have 8gb of ddr3l RAM at 1600mhz and the flash I use is USB 3.0 and has 8gb but only about 4 of them are usable for ReadyBoost
So should I just get the ssd and check how much ram is used while playing some games and if it turns out 8gb is enough, just give up on the flash?

 

[k1114]

Even if it was using all the ram, you are not going to get better gaming performance. Disk caching helps hdd performance and that does not matter for gaming except for loading times.