egpu for x230 tablet

[campanella]

Hello.

I am a newbie here. I am reading posts to make eGPU for my Thinkpad X230 Tablet. Recently I decided to buy this graphic card:
Shapphire Randeon HD 7950
http://www.newegg.com/Product/Product.a ... 006&cm_sp=

Is it a good purchase for my eGPU? I bought it, honestly, because it is in a promotion period. How much performance I can get with the card? Will I have any bottleneck, incompatibility with my card?

The card support PCI Express 3.0. I tried to find the PCI express information on my Thinkpad. Could anyone confirm that Thinkpad X230 Tablet comes with PCI Express 3.0 or 2.0?

Thanks

[blackomegax]

ATI cards will bottleneck on the PCIe bus, vs Nvidia cards which can compress the bus and effectively get 4x PCI-E

And it's only 2.0.

Also beware, you can't put more than 8gb of ram in and still use an eGPU.