punarvasu

Hi all, I'm wondering if the PSU I'm using with my eGPU setup is too weak- maybe someone here can confirm this for me. I'm using an X230 with a PE4L 2.1, with a gtx 770 and a 400w FSP PSU that has two 12 volt rails, one with 17w and the other with 16w. It doesn't seem to be enough to drive an external display. If I plug in an external display and try to boot, it hangs before loading windows. If I plug in the display when already booted, it isn't recognized. Tried multiple cables, displays, and ports. Otherwise, I can boot normally and things work fine. I was trying to make this setup as portable as possible, so I went with a PSU meant for mITX systems. Total wattage is well above the power demands of a gtx 770, or so I thought. I've also noticed that performance appears to be a little lower than it should be. Borderlands 2 was giving ~30-50 fps. Do I need to figure out another PSU solution? Are there other reasons this might be happening? Thanks! -Lenovo x230, i7 3520m, 4gb RAM, gtx 770 2gb, FSP 400w psu, PE4L 2.1