cryogen

It doesnt seem to use the PCIe 2.0 x2 link. So should i go forward with the eGPU?

I have a Lenovo Y500 with 2GB GT650M (currently single card but can be upgraded by adding another 2GB GT650M in SLI using the ultrabay). The iGPU is disabled by Lenovo. I read the forum but still have a few questions before going forward with the eGPU. 1. I went through the schematics for my laptop and it states that i my WiFi adapter is connected to PCIe Gen 1 2x mostly at 10GT/s but it uses a mPCIe slot. Can anybody confirm this and also tell me what kind of link will i get 1.1, 1.2, 1.1Opt or 1.2Opt or otherwise 2. If i use a GTX7xx eGPU with the above configs what will be the approx performance drop compared to 16x desktop counterpart (using external LCD)? 3. What would u recommend me to do... buy an eGPU GTX7xx or go with the lenovo ultrabay with GT650M if i want good gaming performance on FHD? (mainly to allow playable rates for watchdogs ) 4. Has anyone successfully used the Ultrabay slot for connecting an eGPU? (That slot has full PCIe Gen 3 16x slot)