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Hi, I'm having problems trying to connect a GTX 750 Ti to my Lenovo T420 using the dock EXP GDC Beast (express card version). My laptop: Lenovo T420 RAM: 8GB DDR3 CPU: Intel Core i5 2520M GPU: Intel HD Graphics 3000 My problem is: if I plug the express card and I turn on the laptop it doesn't boot up and the screen becomes horrible, with coloured pixels and a sound like "bip-bip". If I try plugging the express card when the laptop is already turned on it sees the gpu, but if try installing the drivers I have to apply the modifies restarting the computer. I hope you understood my problem (I don't speak English very well). Please help me, It's making me crazy! EDIT: I didn't say that if I plug the express card when the pc is already turned on, in the device menager there is "Error 12" on the gtx 750 ti

Problem description 1. What's the problem? I have hooked up my eGPU through the ExpressCard Slot. I have installed all drivers. Under Device Manager it shows my eGPU. Sometimes it will show up with an error 12 but most of the time it does not. When I plug in the HDMI port to my TV, my TV acts like to it received a signal and fails displaying no signal. 2. Have you consulted the Troubleshooting FAQ to resolve the issue? I believe I have delved into it thoroughly but nothing has worked. Thank you for getting me this far, I have been at this for days. 3. Have you consulted the Pre-Purchase FAQ --> "2. How can I check if my notebook is compatible with an eGPU?" Yes, I have also seen many videos and posts of people using my exact same laptop with wonderful success. Platform Description Lenovo ThinkPad T420 Windows 7 64bit SP1 8gb Ram XFX Radeon HD 6870 EVGA 400W PSU [+12V Max Current = 30 Amps] PE4C-EC060A V3.0 ( eGPU PCIe x16 interface for ExpressCard) Notes There are two-3 position switches located on the board. I have them set at their default 1 and 1. The legend on the board notes this: SW1 - PERST# Delay - 1 | Disable - 2 | 9.8 seconds - 3 | 14.8 seconds SW2 - CLK Delay - 1 | Disable - 2 | 11.97 seconds - 3 | 16.9 seconds I have tried these in every possible combination. Any help resolving these issues would be greatly appreciated.

Hey guys, just wanted to make a thread to document my process in implementing an eGPU with my T420. Lenovo T420 without NVS 4200M Modded BIOS 1.46 (enables higher clocks on RAM + more) i5 2540M @ 2.60 GHZ (Boost to 3.3? verifiy) 2x8 (16) GB DDR3 RAM @ 1866 Mhz Intel HD3000 MSI GeForce GTX 950 2GD5 OC 2GB 128-Bit GDDR5 PE4C 3.0 EC Dell Optiplex GX620/SX280 DA-2 220W AC Adapter About 5 years ago I dabbled with eGPU. T420 with NVS 4200M using a PE4L and a GTX 560ti. To use this I needed to run DIY eGPU Setup 1.x due to the TOLUD problem. The setup worked, but was a bit complicated/bloated. (having to chainload the setup, not being able to plug and play, having to restart if you wanted to use eGPU) I rediscovered eGPU and read recent results. People were able to plug and play their eGPU setup without all the hassle. I wanted to try this. I started off with the T420 with NVS 4200m, but couldn't get a setup that would work plug and play style. I bought DIY eGPU Setup 1.3 and found out that it could only be setup on a system in MBR, not GPT. Before I changed my harddrive, I dabbled with the modded BIOS and found a TOLUD setting. While changing a bunch of BIOS settings at the same time (dumb, I know) and ended up bricking my system. I tried to use WINCRISIS to create a bootable USB with an older BIOS to restore my system, but that did not work. I ended up buying a new motherboard without the NVS 4200M. After all of that hassle, I restored my system, reinstalled Windows on an MBR hard drive and began my setup. I hooked up the eGPU, installed the latest _notebook_ NVIDIA drivers, and boom, everything works without hassle. I can boot up with my eGPU plugged in, I can put my system to sleep, unplug/plug and everything works. Optimus is working properly, running low end applications off of HD3000, and higher end applications of the 950. Some apps I have to force to use the 950 via the NVIDIA Control Panel. There is also an option in the control panel to add a context menu item, NVIDIA Control Panel>Desktop> Add Run with graphics processor. My current benchmark in Fire Strike is 4210, which seems low, but comparing it to other scores, I am in the right area for similar setups. My take aways from my experience: dGPU is a pain. If I hadn't messed up my system by messing with the BIOS, I am sure that DIY eGPU Setup would have been the way to go. But I possibly could have changed my TOLUD in my BIOS to get the plug and play system to work. (I don't want to test this because I don't want to accidentally brick my system again) Up next is more benchmarks, overclocking, optimization, and building an enclosure for my setup. Pics of the setup: http://imgur.com/1Hpjiq7,ADwQqEO,1LAAGOP Thanks for reading.