The first problem is your 9400GT is a bit old. I'm surprised there are still updated drivers for it.
That card should still be able to handle World of Warcraft because it was developed for a variety of hardware in mind.
But yeah, you may have to stick with lower settings. Specially since the Wineserver runs in the background eating up CPU's processing power.
Memory size isn't a huge deal, you can actually set it higher than the amount you have. Try searching online for your video card and see if you can find the exact one you have. Sites like
Newegg.com can tell you how much memory you have.
Also, look in the Nvidia Manager and it will probably tell you as well.
Another trick that can take a while to search is:
- Open Terminal: Ctrl+Alt+T
- Type: lshw
This will list all of the hardware specs for your computer. The video card is there somewhere...
The strange colored ground and textures can be direct x related.
You could try installing other d3dx packages and see if they help.
Also try searching
WineHQ's for World of Warcraft Warlords of Draenor to see if anyone else has experienced these symptoms.