Thank you very much Remko78!
As I also happen to have Lenovo X220 with 4GB RAM, I followed your setup and ordered the same things
E4L 2.1b + EC2C with EC-060A
ASUS GTX650-E-1GD5 GeForce GTX 650 PCI-E 3.0 GDDR5 1GB 128-bit Memo 5000 MHz
EZCool AD-970-90W universal laptop adapter (with different connectors)
Lenovo X220, 1.38 BIOS
USB to USB cable
Settings used:
BIOS: PCI Express Speed: Automatic, PCI Express Power Management: Off
PE4L: SW1: 1, SW2: 2-3
Everything went smoothly aswell.
1. Download GTX650 drivers and install them
2. Connect power supplies for the PE4L
3. Connect Expresscard adapter to your computer (windows will probably install some things for you)
4. Enjoy (maybe a restart is required)
Cool thing is that the laptop adapter had also a USB 5V coming out and I did not take the portability hit there. Although, the adapter is 16V with this connector, but everything is working properly... for now. Couldn't find any information on PE4L on how much voltage can it take.
I have not made a case for it yet, but I am looking for one.
I tested it out with Counter-Strike: Global Offensive. Without the PE4L, my FPS rate was from 10-35 with all video settings low. With PE4L, all video settings are on high and my FPS rate is 80-110.