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 | Launch | Model Number | Code name | Fab ( nm ) | Bus interface | Memory ( MiB ) | Core ( MHz ) | Memory ( MHz ) | Config core 1 | Pixel ( GP /s) | Texture ( GT /s) | Bandwidth ( GB /s) | Bus type 2 | Bus width ( bit ) | Processing Power GFLOPs | DirectX | OpenGL | TDP (Watts) GPU only |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Radeon HD 7430M | January 7, 2012 | Seymour Pro | Caicos | 40.0 | PCIe 2.1 x16 | 1024 | 600 | 900 | 160:8:4 | 2.4 | 4.8 | 14.4 | DDR3 | 64.0 | 192 | 11.0 | 4.2 | 7 |
| Radeon HD 7450M | January 7, 2012 | Seymour Pro | Caicos | 40.0 | PCIe 2.1 x16 | 1024 | 700 700 | 900 800 | 160:8:4 | 2.8 | 5.6 | 14.4 25.6 | DDR3 GDDR5 | 64.0 | 224 | 11.0 | 4.2 | 7 |
| Radeon HD 7470M | January 7, 2012 | Seymour XT | Caicos | 40.0 | PCIe 2.1 x16 | 1024 | 750 800 | 900 800 | 160:8:4 | 3.0 3.2 | 6 6.4 | 14.4 25.6 | DDR3 GDDR5 | 64.0 | 240 256 | 11.0 | 4.2 | 7~9 |
| Radeon HD 7490M | January 7, 2012 | Seymour XTX | Caicos | 40.0 | PCIe 2.1 x16 | 1024 | 800 | 950 | 160:8:4 | 3.2 | 6.4 | 30.4 | GDDR5 | 64.0 | 256 | 11.0 | 4.2 | 9 |
| Radeon HD 7510M | January 7, 2012 | Thames LE | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 450 | 800 | 400:20:8 | 3.6 | 9.0 | 12.8 | DDR3 | 64.0 | 360 | 11.0 | 4.2 | 11 |
| Radeon HD 7530M | January 7, 2012 | Thames LP | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 450 | 900 | 400:24:8 | 3.6 | 9.0 | 14.4 | DDR3 | 64.0 | 360 | 11.0 | 4.2 | 11 |
| Radeon HD 7550M | January 7, 2012 | Thames Pro | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 450 550 | 900 800 | 400:20:8 | 3.6 4.4 | 9.0 11.0 | 14.4 25.6 | DDR3 GDDR5 | 64.0 | 360 440 | 11.0 | 4.2 | 13 |
| Radeon HD 7570M | January 7, 2012 | Thames Pro | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 450 650 | 900 800 | 400:20:8 | 3.6 5.2 | 9.0 13.0 | 14.4 25.6 | DDR3 GDDR5 | 64.0 | 360 520 | 11.0 | 4.2 | 13~15 |
| Radeon HD 7590M | January 7, 2012 | Thames XT | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 600 | 800 | 480:24:8 | 4.8 | 14.4 | 25.6 | GDDR5 | 64.0 | 576 | 11.0 | 4.2 | 18 |
| Radeon HD 7610M | January 7, 2012 | Thames LE | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 450 | 800 | 400:20:8 | 3.6 | 9.0 | 25.6 | DDR3 | 128.0 | 360 | 11.0 | 4.2 | 20 |
| Radeon HD 7630M | January 7, 2012 | Thames LP | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 450 | 800 | 480:24:8 | 3.6 | 10.8 | 25.6 | DDR3 | 128.0 | 432 | 11.0 | 4.2 | 20~25 |
| Radeon HD 7650M | January 7, 2012 | Thames Pro | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 450 550 | 800 800 | 480:24:8 | 3.6 4.4 | 10.8 13.2 | 25.6 | DDR3 | 128.0 | 432 528 | 11.0 | 4.2 | 20~25 |
| Radeon HD 7670M | January 7, 2012 | Thames Pro | Turks | 40.0 | PCIe 2.1 x16 | 1024 | 600 | 900 | 480:24:8 | 4.8 | 14.4 | 28.8 57.6 | DDR3 GDDR5 | 128.0 | 576 | 11.0 | 4.2 | 20~25 |
| RadeonHD 7690M | January 7, 2012 | Thames XT | Turks | 40.0 | PCIe 2.1 x16 | 1024 2048 | 725 600 | 900 900 | 480:24:8 | 5.8 4.8 | 17.4 14.4 | 28.8 57.6 | DDR3 GDDR5 | 128.0 | 696 576 | 11.0 | 4.2 | 20~25 |
| RadeonHD 7690M XT | January 7, 2012 | Thames XTX | Turks | 40.0 | PCIe 2.1 x16 | 1024 2048 | 725 | 900 | 480:24:8 | 5.8 | 17.4 | 57.6 | GDDR5 | 128.0 | 696 | 11.0 | 4.2 | 25 |
| RadeonHD 7730M | April 24, 2012 | Chelsea LP | Cape Verde | 28.0 | PCIe 2.1 x16 | 2048 | 575 675 | 900 900 | 512:32:16 | 9.2 10.8 | 18.4 21.6 | 28.8 | GDDR3 | 128.0 | 588.8 691.2 | 11.1 | 4.2 | 25~28 |
| RadeonHD 7750M | April 24, 2012 | Chelsea Pro | Cape Verde | 28.0 | PCIe 2.1 x16 | 1024 2048 | 575 | 1000 | 512:32:16 | 9.2 | 18.4 | 64 | GDDR5 | 128.0 | 588.8 | 11.1 | 4.2 | 28 |
| RadeonHD 7770M | April 24, 2012 | Chelsea XT | Cape Verde | 28.0 | PCIe 2.1 x16 | 1024 2048 | 675 | 1000 | 512:32:16 | 10.8 | 21.6 | 64 | GDDR5 | 128.0 | 691.2 | 11.1 | 4.2 | 32 |
| RadeonHD 7850M | April 24, 2012 | Heathrow Pro | Cape Verde | 28.0 | PCIe 3.0 x16 | 2048 | 675 | 1000 | 640:40:16 | 10.8 | 27 | 64 | GDDR5 | 128.0 | 864 | 11.1 | 4.2 | 40 |
| RadeonHD 7870M | April 24, 2012 | Heathrow XT | Cape Verde | 28.0 | PCIe 3.0 x16 | 2048 | 800 | 1000 | 640:40:16 | 12.8 | 32 | 64 | GDDR5 | 128.0 | 1024 | 11.1 | 4.2 | 40~45 |
Question:
What was the maximum fab (nm)?
Answer:
40.0