I have a similar Problem as emanuu3. My Graphics performance is poor and I'm pretty new to this mackintosh thing so I#m not yet able to fully help myself. I've looked all over the net to retrieve some information concerning the Intel HD4400 graphics support in Mac OS.
The System: GA H87N-WiFi, Core i3 4130T (HD4400), 4GB DDR3 1600, 320GB HD
I've tried your hint with chameleon boot args but wasn't successful with that. The sys info always tells me the graphics has 7MB (64 is set in BIOS) and the Vendor, Model and Version are 0x8086, 0x041e and 0x0006. At first I thought the IGPlattform string ist put together from Model and Version but I recently found out that there may not be any coincidence.
Any hints or solving ideas?
Thanks and best regards!