Table:
text: List of Intel Core i7 microprocessors
" " ( , 32 nm)
" " ( , 32 nm)
Model_number sSpec_number Frequency Turbo GPU_frequency Cores L2_cache L3_cache I_O_bus Mult_ Memory Voltage Socket Release_date Part_numbers Release_price_USD_
standard power standard power standard power standard power standard power standard power standard power standard power standard power standard power standard power standard power standard power standard power standard power standard power
Core i7-620M SLBPD(C2)SLBTQ(K0)SLBPE(C2)SLBTR(K0)SLBZT(K0) 2.67 GHz 3/5 500–766 MHz 2 2 × 256 KB 4 MB DMI 20× 2 × DDR3-1066 0.775–1.4V SocketG1 BGA-1288 January 2010 CP80617003981AHCN80617003981AHCN80617006930AA $332
Core i7-640M SLBTN(K0)SLBTP(K0)SLBZU(K0) 2.8 GHz 3/5 500–766 MHz 2 2 × 256 KB 4 MB DMI 21× 2 × DDR3-1066 0.775–1.4V Socket G1BGA-1288 September 2010 CP80617004152AECN80617004152AECN80617006936AA $346

Question: What is the 32nm I/O bus for Intel Core i7 microprocessors when Socket Socket is g1bga-1288?