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Okay so here recently I've came across the new adapter that is being made to adapt the ultrabay slot in the y510p into an external 3.0 x8 slot and I have some questions of how the given system configuration effects the performance of the system as a whole. From what i've seen for cpu they have a certain number of pci express lanes available as listed on intel's website: --i7-4900mq (4700mq as well): /Expansion Options: //PCI Express Revision: 3.0 //PCI Express Configurations: 1x16 2x8 2x4 //Max # of PCI Express Lanes: 16 ///Thoughts: My dad's i7-5820k has 28 lanes available while ours only has 16 express lanes available. I'm probably looking at this wrong, but it looks to me like you can only run so many configuration options on this laptop successfully without running an unsupported pci-e configuration. If a wifi card uses 4 express lanes (a 1.0 x4 slot), and each graphics card uses 8 express lanes when not in sli (3.0x 8 for the on-board 755m, and a 3.0 x8 slot for the ultra bay egpu adapter), this may be the reason why nvidia cards wont work with the ultra bay 3.0 x8 adapter and the 755m still installed. With the oem setup of the on-board 755m and the ultra bay 755m in sli (effectively a 3.0 x8 slot), and while running the wifi card ( a 1.0 x4 slot) you would be utilizing 12 express lanes for this configuration. If you remove the wifi card, I would think you could get the laptop to read a second 3.0 x8 slot and be able to swap between the two cards say for on the go when you only have the on-board 755m and for at home gaming when you have both cards installed but want to swap to the more powerful card for game processing. I would think this has to be the case as to why the exp-gdc adapters (and other adapters of the like) work and allow you to swap between the cards, but you cannot boot the laptop with two 3.0 x8 cards installed unless you uninstall the on board graphics card effectively getting rid of 8 lanes of traffic. My setup: I'm already running the exp-gdc adapter that i have ran out the back under the middle of the battery tray to be able to plug an unplug and still be able to use my laptop as a mobile laptop, and i have a usb wifi card for connectivity. I just purchased the ultra bay external graphics card adapter from ebay (Austria) so whenever the hell that thing comes in I can actually test it out. I also sold my ultra bay card a long time ago on ebay and i just have the hard drive adapter in the tray right now. Thoughts? Feel free to correct me or add info.