I was refering to the add-in video device (nVidia?) rather than the onboard Intel GM965 video that my Y510 utilizes.
The GM965 use "shared memory (up to 384MB) rather than a separate video adapter. It would seem likely that the
nVidia adapter provides a performance advantage. Yet I have seen no issues at all with my GM965 video.
I upgraded my WiFi card by replacing the Intel 3945abg PCIe card with a 4965agn card. I learned the hard way that
it is necessary to purchase a card branded by Lenovo for this upgrade. I initially purchased a generic Intel
4965agn card. But upon installing it, my Y510 would not boot. The BIOS would stop the boot and complain that a
non-Lenovo branded PCIe card was found and the system would not boot until it was removed. Subsequently I sold
that card and paid a bit more on eBay for one that had the requisite Lenovo PN on it. Visually the two 4965agn cards
were identical but for the Lenovo PN on the label. Apparently Lenovo (in their infinite wisdom) has burned an ID into
the card's firmware that must be there for the machine BIOS to bless it during the boot process.