I have a Lenovo Y480 bought in Nov 2012:
I7 (Sorry I don't know the model)
8GB DDR3 RAM
750 GB HDD (GUID)
Intel 4000+Nvidia 630M
Dell wireless (bought from ebay)
Intel Gigabit ethernet
I was able to install Mountain Lion and the update to 8.2 went fine.
The only things not working:
No QE/Ci for the Intel GPU:
3] Chipset Model: Unknown
3] Type: GPU
3] Bus: Built-In
3] VRAM (Total): 64 MB of Shared System Memory
3] Vendor: Intel (0x8086)
3] Device ID: 0x0166
3] Revision ID: 0x0009
3] Kernel Extension Info: No Kext Loaded
65] Resolution: 1024 x 768
65] Pixel Depth: 32-Bit Color (ARGB8888)
65] Main Display: Yes
65] Mirror: Off
65] Online: Yes
The builtin Ethernet is not working.
Battery is not recognized.
I have a dual boot with Linux (Manjaro Linux an Arch Linux derivative) using UEFI and GUID and ML. I am not able to get Chamelon to install as the default bootloader or to get grub2 to boot ML. I have to use the USB installer.
I installed using the iaktos ML.