I've even lowered the resolution and dpi (as some of these screenshots suggest they lowered their device resolution to possibly get a better score) but as of the current version of Antutu, they made it so that it doesn't affect the score at all. I can bump all the way down to 480 or lower with the 3D part running at pretty much max frames, and it doesn't affect the score at all. However I've noticed some people are also running an OLDER version of Antutu which might explain something.
I've OC'd my cpu and GPU and I can't even come close to 40k, even with literally no processes running on a custom rom.