Thanks for the reply, EssArrBee. Your explanation of the relationship between RAM and VRAM is excellent, and I've updated the original post to reflect my model. I'm glad to report that after digging through my SkyrimPrefs and enblocal.ini settings (particularly the [MEMORY] section, of course), I was able to drastically reduce the stuttering. I'm still not seeing huge improvements in my VRAM utilization, though. For the benefit of future generations, I used the INI Tweaks here: https://wiki.step-project.com/STEP:2.2.8#1.D._INI_Tweaks and the enblocal guide here: https://wiki.step-project.com/Guide:ENB#tab=Editing_Enblocal_INI. I've added a couple more tweaks to the enblocal file (notably, unsafe memory hacks :), so we'll see how that goes! After that, I'll probably be forced to admit that my system RAM is bottlenecking the flow of data from my disk to my VRAM.