Hmm, I'm not convinced that the X series uses flash instead of Ram, but neither can I definitively prove otherwise. I could've sworn it was listed as loading to Ram on the site, but that might just be a feature of the other X series carts.
I did find this thread of others talking about it:
https://atariage.com/forums/topic/27957 ... questions/
But some of the info was incorrect too, so take with a grain of salt and all that.
I also read that loading to flash improves the power draw, and thus battery life (something I haven't thought about); so if correct, the older everdrive is actually better for handheld use in that respect.