Here is Eternal Lands, a free 3D MMORPG.

The game use gl4es and is playable. You may need to lower some details (the cloud shadow eats a lot of CPU, and the reflection too). You can also reduce the viewing distance. It should be nicely playable on Gigahertz. Lower model will need to reduce viewing distance (also, use the "poor man" preset). CC will need a Swapfile, not sure for other models.

History log
=========
Build 02
-------------
* Better initial setup parameter
* Change file permission to allow download of new / changed content

Build 01
-------------
* Initial build
* Some Pandora customisations