What is the width of the channel of NoC in GPU?

Network on chip (Noc) contains the request channel and the reply channel.The request channel delivers request packets to the L1(or L2 or DRAM).The reply channel sends response packets to the cores.
The question is :
Q1. If there is a 128-bit graphics card that is means the width of both the request channel and the reply channel is 128-bit ?
Q2.When Q1 is true ,do request packets in the request channel is 128-bit? if it is wrong ,what is the size of request packets ?

please correct me if there is any mistakes.

Thanks and Regards