difference between double wide PCIex16 vs double wide PCIe Gen3 x16

[joe123]

Hello forum,

Tyan does offer several GPU Computing Platforms.  Some of them are:


Tyan Thunder HX GA88B5631 (B5631G88V2HR-2T-N)

4 Double-width PCIex16 slots for GPUs
https://tyan.com/Barebones_GA88B5631_B5631G88V2HR-2T-N

     vs.

TYAN FT77CB7079 (B7079F77CV10HR-N)
8 Double-Wide PCIe Gen3 x16 Slots for NVIDIA Tesla GPUs

https://tyan.com/Barebones_FT77CB7079_B7079F77CV10HR-N



My question:
Whats the difference between double wide PCIex 16 vs double wide PCIe Gen3 x16?


Thank's for any feedback!

Joe