That's interesting. My Dell Inspiron 15 laptop with a Core i3 1.9Ghz processor and 4GB of RAM is just as responsive, and in some cases even more so, than my desktop, whose specs are listed below.
Both have the 64 bit, 1703 Creators Update Windows 10 Pro installed. The only reason my desktop has 16GB of RAM is because Newegg had a sale at the time and 16GB was only about $10 more than 8GB of the exact same memory. I don't know what the clock speed of the memory in the laptop is, but it's definitely not any higher than that of the desktop, and is most likely less.
Perhaps I've just been lucky.
If memory serves right Gabe, the FX-6100 is a good bit slower than an i3 @ 1.9Ghz (I assume an i3 3227U?). Which would explain why the one with a lower amount of RAM feels the same, if not faster. Regardless, I can almost promise ya, if you upped your RAM, then prefetch would be a happy annoyance.
You're correct on the i3 being the 3227u, but it's just over half the clock speed of the FX6100, and less than half when it comes to benchmarking.
It's probable that the performance of the laptop, at least when it comes to things like opening and running basic programs and such, is faster due to it being more integrated. Feed it something more intensive and it will most likely fall behind the desktop, and quickly.