I did manage to install yosemite public beta 1 on Acer Aspirex3900 using MacPwn for DP4 and clover. I had to Rename the downloaded yosemite beta application as "Install OS X 10.10 Developer Preview.app". I manually copy FakeMSC and Nullcpupower to S/L/E of installer manually. Place voodooHDA 2.8.6 and intel ethernet e1000 kext in kext folder on MacPwn folder on desktop when I made installer. Audio is low volume. The rest are fine. Graphic is better than Mavericks. Slight Lagging is noticed.PS2kb doesn't work even with voodoops2kext.