Bus width should be the same as the ram memory, either one channel at 64bit or dual channel at 128bit.
Memory clock is the same as the ram memory clock as well.
Core clock is dependant on CPU model, notebookcheck and tech arp has some information:
HD Graphics (Sandy Bridge) 12@350 - 1100MHz
If the frequency is right then it should turn out something like this.
Pixel Fillrate should be 2*1100MHz = 2.2GP/s
Texture Fillrate should be 4*1100Mhz = 4.4GT/s