Yes. Thunderbolt bandwidth falls between a PCI-E 2.0 1x slot and 4x slot. Tests that have been done comparing the performance of relatively high end desktop ca

Yes. Thunderbolt bandwidth falls between a PCI-E 2.0 1x slot and 4x slot. Tests that have been done comparing the performance of relatively high end desktop cards on 1x, 4x, 8x and 16x slots have established that while there is a performance penalty, such a solution would still out perform most mobile GPUs. http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/25.html http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_S... http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Express_Scaling/24.html http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Expres...