| BenQ-Siemens P51 | Motorola RIZR Z8 |
| Manufacture | BenQ-Siemens | Motorola |
| Model | P51 | RIZR Z8 |
| Form factor | Block | Slider |
| Weight | 170 gram | 117.00 |
| Dimensions (HxWxD) | 122 x 60 x 20 | 110.00 x 51.00 x 16.00 |
| Operating System | Other | UIQ |
| Networks | 2G - 900/1800 | 2G - 850/900/1800/1900 3G - 2100 |
| HSCSD |  | |
| GPRS |  | |
| EDGE | | |
| UMTS | | |
| HSDPA | | |
| HSPA+ | | |
| WiMAX | | |
| LTE (4G light) | | |
| WLAN / Wi-Fi | | |
| Wi-Fi Hotspot | | |
| Wi-Fi Direct | | |
| SMS | | |
| MMS | | |
| | |
| HDMI out | | |
| USB port | | |
| MHL | | |
| Bluetooth | | |
| Bluetooth version | NA | NA |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | 1.3 Megapixels | 2 Megapixels, 8x digital zoom |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | NA |
| Video recording | | |
| Video capture resolution | NA | NA |
| Second Camera | NA | NA |
| Display size | 2.8 inches | 2.20 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 65536 | 16777216 |
| Display width | 240 | 240 |
| Display height | 320 | 320 |
| PPI | 142.86 | 181.82 |
| Second Display | NA | NA |
| CPU | NA | NA |
| GPU | NA | NA |
| Memory | 128 MB, 128 MB Flash | 80 MB. Expandable up to 4GB with microSD card |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | Polyphonic 64 voices | Polyphonic 64 voices, MP3, AAC, eAAC+, A |
| Java | | |
| Games | Yes | NA |
| FM Radio | | |
| Battery | Li-Ion 1370 mAh | NA |
| Standby time (h) | 150 | 384 |
| Talktime (m) | 240 | 420 |
| Wireless Charging | | |
| Browser | 2.0 | 2.0 |
| Calendar | | |
| Voicedialing | | NA |
| IP Code | NA | NA |
| Predictive text | | NA |
| RSS reader | | |
| Voicememo | | NA |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |