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Asus ROG Phone 3 Strix (128GB/12GB) vs LG K40 (X420EMW)

Side by side comparison between Asus ROG Phone 3 Strix vs LG K40 phones, differences, pros, cons with full specifications. What's the better?

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Compare LG K40 XAsus ROG Phone 3 Strix (128GB/12GB)27Points
Asus ROG Phone 3 Strix (128GB/12GB)
6.59"
AMOLED

1080x2340

64
MP

24mp

12GB
RAM

64bit Octa

6000
mAh

(Non removable)

vs
LG K40 (X420EMW)
5.7"
IPS

720x1440

16
MP

8mp

2GB
RAM

64bit Octa

3000
mAh

(Non removable)

What's the better phone? Asus ROG Phone 3 Strix (128GB/12GB)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

ROG Phone 3 Strix (128GB/12GB)27 Advantages Asus ROG Phone 3 Strix (128GB/12GB)vsK40 (X420EMW)7 Advantages LG K40 (X420EMW)
+2.84Ghz 64bit Octa-Core48%
More powerful processor, you can open your applications faster
vs2Ghz 64bit Octa-Core
+12GB LPDDR55 times
More RAM memory. Typically more responsive and better for multitasking.
vs2GB LPDDR3
+128GB (100GB available)4 times
More internal storage for applications and files
vs32GB (20GB available)
+UFS 3.1Advantage
Fastest write and read storage.
vseMMC 5.1
+Aluminum frame, glass front/backAdvantage
More resistant material
vsPlastic body, glass front
+AMOLEDAdvantage
AMOLED display is brighter and more vivid
vsTFT IPS LCD
+1 billion62 times
More colors on the screen is better quality images and videos
vs16 million
+1080x2340 pixels144%
Higher resolution screen
vs720x1440 pixels
+391 PPI39%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
vs282 PPI
+6.59"16%
Larger screen
vs5.7"
+(triple camera) 64MP + 13MP + 5MP4 times
Higher resolution main camera
vs(back) 16MP
+1/1.72" inches74%
The larger sensor camera lets you take photos with better depth.
vs1/3" inches
+f/1.8 (aperture)11%
Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
vsf/2.0 (aperture)
+(front) 24MP198%
Higher resolution secondary camera to take pictures and selfies
vs(front) 8MP
+8K UHD (7680x4320)15 times
More image quality for recording videos with the primary camera
vsFull HD (1920x1080)
+Android 10Advantage
Android 10 is newer and safer
vsAndroid 8.1 Oreo
+5G SA/NSAAdvantage
The 5G SA/NSA network is newer and faster
vs4G+ LTE-A
+(5G SA/NSA) 5000 Mbps16 times
Faster for surfing the internet and download files
vs(4G+ LTE-A) 300 Mbps
+CompassAdvantage
Sensors help you use the device
vsNot supported
+GyroscopeAdvantage
Sensors help you use the device
vsNot supported
+Face unlockAdvantage
Sensors help you use the device
vsNot supported
+6000 mAh100%
Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
vs3000 mAh
+802.11 a/b/g/n/ac/ax (2.4Ghz, 5Ghz) Wifi6 + MIMOAdvantage
WiFi 802.11 a/b/g/n/ac/ax (2.4Ghz, 5Ghz) Wifi6 + MIMO is newer and faster
vs802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
+5.1 + A2DP/LEAdvantage
Bluetooth 5.1 + A2DP/LE is newer and faster
vs5.0 + A2DP/LE
+USB 3.1 Type-C, USB OTG On-The-GoAdvantage
Newer and faster USB version for transferring photos, mp3 or data.
vsMicroUSB 2.0, USB OTG On-The-Go
+Type-CAdvantage
Reversible connector, you can stick in a USB-C cable any which way; either side is up.
vsMicroUSB 2.0, USB OTG On-The-Go
+Gorilla Glass 6Advantage
Protection against scratches on the screen lets you carry your phone with your keys
vsNot supported
Not supportedvs+Until 1TB microSD, microSDXCAdvantage
More external storage for files using memory cards
240 grams (8.4 ounces)vs+145 grams (5.08 ounces)66%
Lighter
9.85 millimeters (0.39 inches)vs+8.3 millimeters (0.33 inches)19%
Thinner
LED flashvs+LED flash on both camerasAdvantage
The LED flash on both cameras helps in dark places or in low light
Type-C jack with 3.5mm jack adaptervs+3.5mm jackAdvantage
Headsets with 3.5mm Jack size are more common and easy to find in stores
Not supportedvs+DLNAAdvantage
With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
Not supportedvs+MIL-STD-810G military certifiedAdvantage
Protection against water allows you talk to your friends in the rain, for example

20 Common items in both devices
Only digital zoom
PDAF: phase detection autofocus
EIS: Digital stabilization
HDR photo on both cameras
(front) Full HD (1920x1080)
Capacitive
Multitouch
+13 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differencesClear highlight
Physical featuresAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
ModelROG Phone 3 Strix (128GB/12GB)K40 (X420EMW)
Other model namesAsus ROG Phone 3 ZS661KS Strix edition (12GB RAM)LG K40 LMX420EMW NFC Dual-sim, LM-X420EMW, LG-LMX420EMW
Country or region available(Global, International)
(Global, International)
(Global, International)(Europe)
(Global, International), (Europe)
BrandAsusLG
Release dateJuly, 2020March, 2019
Depth9.85 millimeters (0.39 inches)8.3 millimeters (0.33 inches)
Size (width x height)78 x 171 millimeters (3.07 x 6.73 in)71.9 x 153 millimeters (2.83 x 6.02 in)
Weight240 grams (8.4 ounces)145 grams (5.08 ounces)
Qwerty physical keyboardNot supportedNot supported
AntennaInternal antennaInternal antenna
Build, materialsAluminum frame, glass front/backPlastic body, glass front
Protection against water and othersNot supportedMIL-STD-810G military certified: salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant.
System (OS)Asus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
Operating systemAndroid 10Android 8.1 Oreo
Firmware updatefeature not registeredfeature not registered
HardwareAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
Chipset64bit - Qualcomm Snapdragon 865 SM8250 (7nm)64bit - MediaTek MT6762 Helio P22 (12nm)
CPU processorOcta-Core, 3 processors:
2.84Ghz Single-Core Kryo 585
2.42Ghz 3-Cores Kryo 585
1.8Ghz Quad-Core Kryo 585
Octa-Core, 2 processors:
2Ghz Quad-Core ARM Cortex-A53
1.5Ghz Quad-Core ARM Cortex-A53
GPU graphical controllerQualcomm Adreno 650PowerVR GE8320 650Mhz
RAM memory12GB LPDDR52GB LPDDR3
Internal storage128GB (100GB available)
UFS 3.1
32GB (20GB available)
eMMC 5.1
External storageNot supportedUntil 1TB microSD, microSDXC
(dedicated slot)
DisplayAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
Display typeAMOLEDTFT IPS LCD
Screen size6.59" inches5.7" inches
Screen-to-body ratio~79.9% (screen-to-body ratio)~76.2% (screen-to-body ratio)
Display resolution1080x2340 pixels (19.5:9)720x1440 pixels
TouchscreenCapacitive Multitouch 10-pointsCapacitive Multitouch
Pixel density (dot pitch)391 PPI282 PPI
Colors1 billion16 million
Scratch-resistant glassGorilla Glass 6Not supported
Display features144Hz, 650 nits, HDR10+feature not registered
Mobile networksAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
Dual-SIMDual-SIM Standby - Call active on one sim cardDual-SIM Standby - Call active on one sim card
(dedicated slot)
SIM card2 slots (Dual-SIM)
nano-SIM (4FF)
2 slots (Dual-SIM)
nano-SIM (4FF)
Maximum download/upload5000/150 Mbps300/50 Mbps
Network technology2G, 3G, 4G, 5G2G, 3G, 4G
Frequency, bandsExpand band detailsCollapse details
GSM Mhz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkCDMA 800, GSM 850/900/1800/1900GSM 850/900/1800/1900
Primary 3G networkCDMA2000 1xEV-DO
TD-SCDMA 1900/2000
UMTS 850/900/1700/1900/2100
UMTS 850/900/1900/2100
Primary 4G networkLTE Cat20 (1, 2, 3, 4, 5, 7, 8, 20, 28)
TD-LTE (34, 38, 39, 40, 41)
VoLTE
LTE Cat6 (Bands 1, 3, 5, 7, 8, 20)
TD-LTE (Bands 38)
Primary 5G networkSA/NSA (41, 77, 78, 79)Not supported
Primary data networkGPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, 5G SA/NSAGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A
Secondary 2G networkGSM 850/900/1800/1900GSM 850/900/1800/1900
Secondary 3G networkNot supportedNot supported
Secondary 4G networkNot supportedNot supported
Secondary data networkGPRS, EDGEGPRS, EDGE
CallingAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
MessagingSMS (T9), MMS, E-mail, Push mailSMS (T9), MMS, E-mail, Push mail
SpeakerphoneSupportedSupported
Video callingSupportedSupported
Call controlVoice dialing, Voice recorder, Voice commandsVoice dialing, Voice recorder
CameraAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
Back camera (main camera)(triple camera)
64 megapixels
13MP ultrawidef/2.4125º11mm
5MP macrof/2.0
16 megapixels
Main camera resolution10120x6328 pixels4608x3456 pixels
Video recording (primary)8K UHD (7680x4320) 30 fpsFull HD (1920x1080) 30 fps
FlashLED flashLED flash on both cameras
Focal aperturef/1.8 (aperture)f/2.0 (aperture)
Focal length26mm lensfeature not registered
Sensor size1/1.72" inches1/3" inches
Pixel size0.8µm pixel1µm pixel
AutofocusPDAF: phase detection autofocusPDAF: phase detection autofocus
Touch focusSupportedSupported
Image stabilizationEIS: Digital stabilizationEIS: Digital stabilization
ZoomOnly digital zoomOnly digital zoom
Face/smile detectionFace detection, Smile detectionFace detection, Smile detection
BSI sensorNot supportedNot supported
HDRHDR photo on both camerasHDR photo on both cameras
2ª cameraAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
Front camera (secondary)24 megapixels8 megapixels
Front camera resolution5632x4224 pixels3264x2448 pixels
Video recording (secondary)Full HD (1920x1080)Full HD (1920x1080)
Front flashNot supportedLED
Focal aperturef/2.0 (aperture)f/2.0 (aperture)
Focal length27mm lensfeature not registered
Sensor sizefeature not registeredfeature not registered
Pixel size0.9µm pixelfeature not registered
MultimediaAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
RadioNot supportedNot supported
TVNot supportedNot supported
Video formatsMP4, H.265, H.264, H.263, XviD, MKVMP4, H.264, H.263, XviD, MKV
Audio formatsMP3, WAV, WMA, eAAC+, FLACMP3, WAV, WMA, eAAC+, FLAC
ConnectivityAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
USBUSB 3.1 Type-C, USB OTG On-The-GoMicroUSB 2.0, USB OTG On-The-Go
TV outputUSB Type-C (reversible)Not supported
Audio outputType-C jack with 3.5mm jack adapter3.5mm jack
Bluetooth5.1 + A2DP/LE5.0 + A2DP/LE
WiFi802.11 a/b/g/n/ac/ax (2.4Ghz, 5Ghz) Wifi6 + MIMO802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
DLNANot supportedSupported
NFCSupportedSupported
GPSA-GPS, GeoTagging, GLONASS, GALILEO, QZSSA-GPS, GeoTagging
Infrared portNot supportedNot supported
Other functionsAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
Active noise cancellationSupportedSupported
Vibrating alertSupportedSupported
RingtonesPolyphonic and customizedPolyphonic and customized
Web browserHTML, XHTML, HTML5HTML, XHTML, HTML5
SensorsAccelerometer
Proximity sensor
Compass
Ambient Light sensor
Gyroscope
Gesture
Hall effect
Face unlock
Fingerprint sensor (under display)
Accelerometer
Proximity sensor
Ambient Light sensor
Fingerprint sensor (rear-mounted)
Other features- Colors: Black glare
- ROG UI (Republic Of Gamers)
- Always-On display
- DTS:X stereo speakers (2 amplifiers)
- 24-bit/192kHz audio
- AeroActive Cooler 3
- WiFi direct, hotspot
- Colors: Black, Moroccan Blue, Platinum Gray
- 18:9 ratio FullVision display
- LED notification
- DTS-X Surround sound
- WiFi direct, hotspot
Power supplyAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
BatteryLiPo: Li-Ion polymer (Non removable)Li-Ion: Lithium-Ion (Non removable)
Battery capacity6000 mAh3000 mAh
Charger, watts30W Fast battery charging
10W Reverse charging USB between devices
Quick Charge 3/4
USB Power Delivery 3.0
Standard charging
Talk time autonomyfeature not registered480 minutes | 8 hours | 0.3 day
Standbyfeature not registered6000 minutes | 100 hours | 4.2 days
Radiation rateAsus ROG Phone 3 Strix (128GB/12GB)LG K40 (X420EMW)
SAR 1.6W/kg (USA, Mexico, etc.)feature not registeredfeature not registered
SAR 2W/kg (Europe, UK, etc.)feature not registeredfeature not registered
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