| Manufacture | LG | LG |
| Model | Optimus 4X HD | P520 |
| Form factor | Block | Block |
| Weight | 130 gram | 120.00 |
| Dimensions (HxWxD) | 133 x 68 x 9 | 109.00 x 54.00 x 13.00 |
| Operating System | Android | Other |
| Networks | 2G - 850/900/1800/1900
3G - 900/1900/2100 | 2G - 850/900/1800/1900
|
| HSCSD |  | |
| GPRS |  | |
| EDGE | | |
| UMTS | | |
| HSDPA | | |
| HSPA+ | | |
| WiMAX | | |
| LTE (4G light) | | |
| WLAN / Wi-Fi | | |
| Wi-Fi Hotspot | | |
| Wi-Fi Direct | | |
| SMS | | |
| MMS | | |
| Email | | |
| HDMI out | | |
| USB port | | |
| MHL | | |
| Bluetooth | | |
| Bluetooth version | 4.0 | NA |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | 8 megapixel, autofocus | 2 megapixel, autofocus |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | NA |
| Video recording | | |
| Video capture resolution | 1080p | NA |
| Second Camera | NA | NA |
| Display size | 4.7 inches | 2.80 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 16700000 | 256000 |
| Display width | 720 | 240 |
| Display height | 1280 | 320 |
| PPI | 312.47 | 142.86 |
| Second Display | NA | NA |
| CPU | 1.5 GHz quad-core Nvidia Tegra 3 | NA |
| GPU | NA | NA |
| Memory | 1 GB RAM, 16 GB internal storage | 40 MB. Expandable up to 4 GB with microSD card |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | MP3 | MP3, AAC, AAC+, eAAC+, WMA, WAV, AMR |
| Java | | |
| Games | Yes | Yes |
| FM Radio | | |
| Battery | 2140 mAh | 1500 mAh |
| Standby time (h) | NA | 400 |
| Talktime (m) | NA | 600 |
| Wireless Charging | | |
| Browser | Android HTML Webkit | 2.0 XHTML, HTML, Opera Mobile 5 |
| Calendar | | |
| Voicedialing | | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | NA |
| Voicememo | | NA |
| PC Synchronization | | NA |
| SyncML | | NA |
| Website | Website | Website |
