Amazon.com: Valley Of The Sun New Graphics Video Card Replacement, for Lenovo IdeaCentre B500 B505 B50R1 All-in-One Desktop PC Computer, NVIDIA GeForce GT 540M GDDR5 2GB N12P-GS-A1, MXM VGA Board Repair Parts :
NVIDIA makes GeForce GT 500M family official, introduces GTX 485M as its fastest mobile GPU | Engadget
608545-001 | HP nVidia GeForce GT230M PCI-Express 2.0 1GB MXM N10p Mezzanine Video Graphics Card