<Table> Surface Pro 4 <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Developer </Th> <Td> Microsoft </Td> </Tr> <Tr> <Th> Product family </Th> <Td> Surface </Td> </Tr> <Tr> <Th> Type </Th> <Td> 2 - in - 1 detachable </Td> </Tr> <Tr> <Th> Generation </Th> <Td> 4th </Td> </Tr> <Tr> <Th> Release date </Th> <Td> October 26, 2015 </Td> </Tr> <Tr> <Th> Introductory price </Th> <Td> $899 (£ 749) </Td> </Tr> <Tr> <Th> Operating system </Th> <Td> Windows 10 Pro </Td> </Tr> <Tr> <Th> CPU </Th> <Td> Intel Skylake low - voltage dual - core: m3 - 6Y30 900 MHz up to 2.2 GHz, 4 MB cache, 4.5 W i5 - 6300U 2.4 up to 3.0 GHz, 3 MB cache, 15 W i7 - 6650U 2.2 up to 3.4 GHz, 4 MB cache, 15 W </Td> </Tr> <Tr> <Th> Memory </Th> <Td> 4 GB, 8 GB, or 16 GB </Td> </Tr> <Tr> <Th> Storage </Th> <Td> PCI - Express SSD: 128 GB, 256 GB, 512 GB, or 1 TB </Td> </Tr> <Tr> <Th> Display </Th> <Td> 12.3 inches (31 cm) 2736x1824 (267ppi) PixelSense display with 3: 2 aspect ratio </Td> </Tr> <Tr> <Th> Graphics </Th> <Td> <P> m3: Intel HD graphics 515 i5: Intel HD graphics 520 </P> i7: Intel Iris 540 graphics </Td> </Tr> <Tr> <Th> </Th> <Td> 292.1 millimetres (11.50 in) (width) 201.42 millimetres (7.930 in) (height) 8.45 millimetres (0.333 in) (depth) </Td> </Tr> <Tr> <Th> Weight </Th> <Td> <P> m3: 766 grams (1.689 lb) i5: 786 grams (1.733 lb) </P> i7: 786 grams (1.733 lb) </Td> </Tr> <Tr> <Th> Predecessor </Th> <Td> Surface Pro 3 </Td> </Tr> <Tr> <Th> Successor </Th> <Td> Surface Pro (5th generation) </Td> </Tr> </Table> <Tr> <Th> Developer </Th> <Td> Microsoft </Td> </Tr>

What type of ssd is in the surface pro 4