I guess that is one way to go, but I've never used it much, because I've never seen an improvement. I just plugged in a 32GB 3.0 flash drive and set it to be dedicated, thinking that it would use more than just 4GBs as is the max with the sliding scale setting, but it didn't increase the amount RAM available, according to CoreTemp, and I also noticed that the current amount of RAM being used is slightly greater than before setting it up. Also looking at the drive in the file manager, the readyboost file is labeled at only 4GBs, so there is no point in dedicating it to readyboost.