Screen size
K40S6.1"
Q51Winner: 6.5"+6.2%
Quick verdict
Q51 leads the measured specs 5-2.
Measured wins
K40S
2
spec wins
Ties
11
equal specs
Q51
5
spec wins
Overall winner
Screen size
Technology
K40S
GSM / HSPA / LTE
Q51
GSM / HSPA / LTE
2G bands
K40S
GSM 850 / 900 / 1800 / 1900
Q51
GSM 850 / 900 / 1800 / 1900
3G bands
K40S
HSDPA 850 / 900 / 1900 / 2100
Q51
HSDPA 850 / 900 / 1900 / 2100
4G bands
K40S
1, 3, 7, 8, 20
Resolution
equal specsRefresh rate
Peak brightness
Pixel density
CPU speed
equal specsRAM
Storage
equal specsMain camera
equal specsFront camera
equal specsBattery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Q51
1, 3, 7, 8, 20
Speed
K40S
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Q51
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/75 Mbps
Announced
K40S
2019, August. Released 2019, September
Q51
2020, February 25. Released 2020, February 26
Status
K40S
Discontinued
Q51
Discontinued
Dimensions
K40S
156.3 x 73.9 x 8.6 mm (6.15 x 2.91 x 0.34 in)
Q51
164.5 x 77.5 x 8.4 mm (6.48 x 3.05 x 0.33 in)
Weight
K40S
186 g (6.56 oz)
Q51
-
SIM
K40S
· Nano-SIM· Nano-SIM + Nano-SIM
Q51
Nano-SIM + Nano-SIM
Other
K40S
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Q51
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Type
K40S
IPS LCD
Q51
IPS LCD
Size
K40S
6.1 inches, 92.9 cm2 (~80.4% screen-to-body ratio)
Q51
6.5 inches, 105.5 cm2 (~82.7% screen-to-body ratio)
Resolution
K40S
720 x 1520 pixels, 19:9 ratio (~276 ppi density)
Q51
720 x 1520 pixels, 19:9 ratio (~259 ppi density)
OS
K40S
Android 9.0 (Pie), upgradable to Android 10
Q51
Android 10
Chipset
K40S
Mediatek MT6762 Helio P22 (12 nm)
Q51
Mediatek MT6762 Helio P22 (12 nm)
CPU
K40S
Octa-core 2.0 GHz Cortex-A53
Q51
Octa-core 2.0 GHz Cortex-A53
GPU
K40S
PowerVR GE8320
Q51
PowerVR GE8320
Card slot
K40S
microSDXC (dedicated slot)
Q51
microSDXC (dedicated slot)
Internal
K40S
32GB 2GB RAM, 32GB 3GB RAM
Q51
32GB 3GB RAM
Other
K40S
eMMC 5.1
Q51
eMMC 5.1
Dual
K40S
13 MP, f/2.2, 26mm (wide), PDAF 5 MP, (ultrawide)
Q51
-
Features
K40S
LED flash, panorama, HDR
Q51
LED flash, panorama, HDR
Video
K40S
1080p@30fps
Q51
1080p@30fps
Triple
K40S
-
Q51
13 MP, (wide), PDAF 5 MP, 13mm (ultrawide) Auxiliary lens
Single
K40S
13 MP, f/2.0, 1/3.1", 1.12µm
Q51
13 MP, (wide), 1/3.1", 1.12µm
Video
K40S
1080p@30fps
Q51
1080p@30fps
Loudspeaker
K40S
Yes
Q51
Yes, with stereo speakers
3.5mm jack
K40S
Yes
Q51
Yes
WLAN
K40S
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA
Q51
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA
Bluetooth
K40S
5.0, A2DP, LE
Q51
5.0, A2DP, LE
Positioning
K40S
GPS, GLONASS
Q51
GPS
NFC
K40S
Yes (market/region dependent)
Q51
Yes
Radio
K40S
No
Q51
No
USB
K40S
microUSB 2.0, OTG
Q51
USB Type-C 2.0
Sensors
K40S
Fingerprint (rear-mounted), accelerometer, proximity
Q51
Fingerprint (rear-mounted), accelerometer, proximity, compass
Type
K40S
Li-Po 3500 mAh, non-removable
Q51
Li-Po 4000 mAh
Colors
K40S
New Aurora Black, New Moroccan Blue
Q51
Frozen White, Moonlight Titanium
Models
K40S
LMX430HM, LM-X430
Q51
LM-Q510N
Price
K40S
About 160 EUR
Q51
About 240 EUR