| Attribute |
Lenovo IdeaPad Flex (81SR000DUS) × | 
Lenovo IdeaPad S540 (81NG005PRU) × |
| General | | |
| Model | Lenovo IdeaPad Flex | Lenovo IdeaPad S540 |
| Product code | 81SR000DUS | 81NG005PRU |
| Design | | |
| Product colour | Black | Blue |
| Form factor | Convertible (Folder) | Clamshell |
| Brand | Lenovo | Lenovo |
| Family | IdeaPad | IdeaPad |
| Series | Flex | S |
| Model name | Flex | S540 |
| Part number | 81SR000DUS | 81NG005PRU |
| Release year (year) | 2019 | 2020 |
| Processor | | |
| Processor manufacturer | Intel | Intel |
| Processor family | 8th gen Intel Core i7 | 10th gen Intel Core i7 |
| Processor frequency (GHz) | 1.8 | 1.8 |
| Processor boost frequency (GHz) | 4.6 | 4.9 |
| Processor model | i7-8565U | i7-10510U |
| Processor cores | 4 | 4 |
| Processor threads | 8 | 8 |
| Processor lithography (Nm) | 14 | 14 |
| Processor socket | BGA 1528 | BGA 1528 |
| Processor cache (MB) | 8 | 8 |
| Memory | | |
| Internal memory type | DDR4-SDRAM | DDR4-SDRAM |
| Maximum internal memory (GB) | 16 | 12 |
| Memory clock speed (MHz) | 2,400 | 2,400 |
| Internal memory (GB) | 16 | 12 |
| Display | | |
| Display diagonal (inch) | 15.6 | 15.6 |
| Panel type | IPS | IPS |
| HD type | Full HD | Full HD |
| LED backlight | + | + |
| Touchscreen | + | - |
| Dual-screen | - | - |
| Display resolution | 1920 x 1080 pixels | 1920 x 1080 pixels |
| Graphics | | |
| On-board graphics adapter | + | + |
| Discrete graphics adapter model | NVIDIA GeForce MX230 | NVIDIA GeForce MX250 |
| Discrete graphics adapter | + | + |
| Discrete graphics adapter memory (GB) | - | 2 |
| On-board graphics adapter base frequency (MHz) | 300 | 300 |
| Maximum on-board graphics adapter memory (GB) | 32 | 32 |
| On-board graphics adapter model | Intel UHD Graphics | Intel UHD Graphics |
| Storage | | |
| Total storage capacity (GB) | 512 | 512 |
| Number of SSDs installed | 1 | 1 |
| SSD capacity (GB) | 512 | 512 |
| Card reader integrated | + | + |
| Storage media | SSD | SSD |
| Optical drive | - | - |
| Networking | | |
| Wi-Fi standards | - 802.11a
- 802.11b
- 802.11g
- wi-fi 4 (802.11n)
- wi-fi 5 (802.11ac)
| |
| Bluetooth | + | + |
| Ethernet LAN | - | - |
| Wi-Fi | + | + |
| Bluetooth version | 4.2 | 4.2 |
| Ports and interfaces | | |
| USB 3.x Type-A ports | 2 | 2 |
| USB 3.x Type-C ports | 1 | 1 |
| Combo headphone/mic port | + | + |
| USB Sleep-and-Charge | - | + |
| HDMI ports quantity | 1 | 1 |
| Audio | | |
| Speaker power (W) | 2 | 2 |
| Built-in microphone | + | + |
| Camera | | |
| Front camera | + | + |
| Front camera resolution (numeric) (MPixel) | 1 | 1 |
| Front camera HD type | HD | HD |
| Keyboard | | |
| Numeric keypad | - | + |
| Keyboard backlit | - | + |
| Pointing device | Touchpad | Touchpad |
| Software | | |
| Operating system installed | Windows 10 Home | Windows 10 Home |
| Operating system architecture (bit) | 64 | 64 |
| Battery | | |
| Battery capacity (watt-hours) (Wh) | 52 | 52 |
| Battery life (max) (h) | 8 | 12 |
| Weight and dimensions | | |
| Weight (kg) | 2 | 1.95 |
| Height (mm) | 20.5 | 16.9 |
| Depth (mm) | 250 | 245 |
| Width (mm) | 364 | 358 |
| Power | | |
| AC adapter power (W) | 65 | 65 |
| Security | | |
| Fingerprint reader | - | + |
| Trusted platform module (TPM) | + | + |