Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Model | Code name | CPU support | FSB / HT (MHz) | Southbridge |
| --- | --- | --- | --- | --- |
| AMD-640 chipset | AMD-640 | K6 , Cyrix 6x86 | 66 (FSB) | AMD-645 |
| AMD-750 chipset | AMD-751 | Athlon , Duron ( SlotA , SocketA ), Alpha21264 | 100 (FSB) | AMD-756, VIA-VT82C686A |
| AMD-760 chipset | AMD-761 | Athlon, AthlonXP, Duron( SocketA ), Alpha21264 | 133 (FSB) | AMD-766, VIA-VT82C686B |
| AMD-760MP chipset | AMD-762 | AthlonMP | 133 (FSB) | AMD-766 |
| AMD-760MPX chipset | AMD-762 | AthlonMP | 133 (FSB) | AMD-768 |
| AMD-8000 series chipset | AMD-8111 | Opteron | 800 (HT1.x) | AMD-8131 AMD-8132 |
Question:
What is the Southbridge when the CPU support was athlon, athlonxp, duron( socketa ), alpha21264?
Answer:
AMD-766, VIA-VT82C686B