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 number | sSpec number | Frequency | Turbo | GPU frequency | Cores | L2 cache | L3 cache | I/O bus | Mult. | Memory | Voltage | Socket | Release date | Part number(s) | 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 |
| standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded | standard power, embedded |
| Core i7-610E | SLBRZ(C2)SLBXX(K0) | 2.53 GHz | 3/5 | 500–766 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 19× | 2 × DDR3-1066 | 0.775–1.4V | BGA-1288 | January 2010 | CN80617005745AB | $320 |
| low power | low power | low power | low power | low power | low power | low power | low power | low power | low power | low power | low power | low power | low power | low power | low power |
| Core i7-620LM | SLBML(C2)SLBSU(K0) | 2 GHz | 4/6 | 266–566 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 15× | 2 × DDR3-1066 | 0.75–1.4V | BGA-1288 | January 2010 | CN80617003879AD | $300 |
| Core i7-640LM | SLBMK(C2)SLBSV(K0) | 2.13 GHz | 4/6 | 266–566 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 16× | 2 × DDR3-1066 | 0.75–1.4V | BGA-1288 | January 2010 | CN80617003885AE | $332 |
| Core i7-660LM | SLBSW(K0) | 2.27 GHz | 4/6 | 266–566 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 17× | 2 × DDR3-1066 | 0.75–1.4V | BGA-1288 | September 2010 | CN80617004857AA | $346 |
| low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded | low power, embedded |
| Core i7-620LE | SLBP9(C2)SLBXH(K0) | 2 GHz | 4/6 | 266–566 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 15× | 2 × DDR3-1066 | 0.75–1.4V | BGA-1288 | January 2010 | CN80617004455AB | $311 |
| ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power | ultra-low power |
| Core i7-620UM | SLBMN(C2)SLBSX(K0) | 1.07 GHz | 5/8 | 166–500 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 8× | 2 × DDR3-800 | 0.725–1.4V | BGA-1288 | January 2010 | CN80617003882AE | $278 |
| Core i7-640UM | SLBMM(C2)SLBSR(K0) | 1.2 GHz | 5/8 | 166–500 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 9× | 2 × DDR3-800 | 0.725–1.4V | BGA-1288 | January 2010 | CN80617003888AD | $305 |
| Core i7-660UM | SLBSS(K0) | 1.33 GHz | 5/8 | 166–500 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 10× | 2 × DDR3-800 | 0.725–1.4V | BGA-1288 | May 2010 | CN80617005187AB | $317 |
| Core i7-680UM | SLBST(K0) | 1.47 GHz | 5/8 | 166–500 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 11× | 2 × DDR3-800 | 0.725–1.4V | BGA-1288 | September 2010 | CN80617004860AA | $317 |
| ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded | ultra-low power, embedded |
| Core i7-620UE | SLBPA(C2)SLBXJ(K0) | 1.07 GHz | 5/8 | 166–500 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 8× | 2 × DDR3-800 | 0.725–1.4V | BGA-1288 | January 2010 | CN80617004458AB | $289 |
| Core i7-660UE | SLBWV(K0) | 1.33 GHz | 5/8 | 166–500 MHz | 2 | 2 × 256 KB | 4 MB | DMI | 10× | 2 × DDR3-800 | 0.725–1.4V | BGA-1288 | August 2010 | CN80617006204AA | $301 |
Question:
What is I/O bus when socket is socket g1bga-1288?
Answer:
DMI