Screen size
iQOO Z11xWinner: 6.8"+26%
Y51 (2015)5.0"
Quick verdict
iQOO Z11x leads the measured specs 17-4.
Measured wins
iQOO Z11x
17
spec wins
Overall winner
Ties
2
equal specs
Y51 (2015)
4
spec wins
Screen size
Technology
iQOO Z11x
GSM / HSPA / LTE / 5G
Y51 (2015)
GSM / HSPA / LTE
2G bands
iQOO Z11x
GSM 850 / 900 / 1800 / 1900
Y51 (2015)
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands
iQOO Z11x
HSDPA 850 / 900 / 2100
Y51 (2015)
HSDPA 850 / 900 / 2100
4G bands
iQOO Z11x
1, 3, 5, 8, 28, 38, 40, 41
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
NFC
equal specs3.5mm jack
SD card
Stereo speakers
Y51 (2015)
LTE 850 / 900 / 1800 / 2100 / 2600 - Malaysia, LTE 900 / 1800 / 2100 - Thailand, Indonesia
5G bands
iQOO Z11x
1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA
Y51 (2015)
-
Speed
iQOO Z11x
HSPA, LTE, 5G
Y51 (2015)
HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
Announced
iQOO Z11x
2026, March 12
Y51 (2015)
2015, December. Released 2015, December
Status
iQOO Z11x
Released Mar 2026
Y51 (2015)
Discontinued
Dimensions
iQOO Z11x
166.6 x 78.4 x 8.4 mm (6.56 x 3.09 x 0.33 in)
Y51 (2015)
143.8 x 71.7 x 7.5 mm (5.66 x 2.82 x 0.30 in)
Weight
iQOO Z11x
219 g (7.72 oz)
Y51 (2015)
157 g (5.54 oz)
Build
iQOO Z11x
Glass front, plastic frame, plastic back
Y51 (2015)
-
SIM
iQOO Z11x
Nano-SIM + Nano-SIM
Y51 (2015)
Dual SIM
Other
iQOO Z11x
IP68/IP69 dust tight and water resistant (high pressure water jets; immersible up to 1.5m for 30 min)
Y51 (2015)
-
Type
iQOO Z11x
IPS LCD, 120Hz, 1200 nits (HBM)
Y51 (2015)
IPS LCD
Size
iQOO Z11x
6.76 inches, 112.1 cm2 (~85.8% screen-to-body ratio)
Y51 (2015)
5.0 inches, 68.9 cm2 (~66.8% screen-to-body ratio)
Resolution
iQOO Z11x
1080 x 2344 pixels, 19.5:9 ratio (~382 ppi density)
Y51 (2015)
540 x 960 pixels, 16:9 ratio (~220 ppi density)
OS
iQOO Z11x
Android 16, OriginOS 6
Y51 (2015)
Android 5.0.2 (Lollipop), Funtouch 2.5
Chipset
iQOO Z11x
Mediatek Dimensity 7400 Turbo (4 nm)
Y51 (2015)
Qualcomm MSM8916 Snapdragon 410 (28 nm)
CPU
iQOO Z11x
Octa-core (4x2.6 GHz Cortex-A78 & 4x2.0 GHz Cortex-A55)
Y51 (2015)
Quad-core 1.2 GHz Cortex-A53
GPU
iQOO Z11x
Mali-G615 MC2
Y51 (2015)
Adreno 306
Card slot
iQOO Z11x
No
Y51 (2015)
microSDXC (dedicated slot)
Internal
iQOO Z11x
128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM
Y51 (2015)
16GB 2GB RAM
Other
iQOO Z11x
UFS 3.1
Y51 (2015)
eMMC 4.5
Dual
iQOO Z11x
50 MP, (wide), 1/2.93", PDAF Auxiliary lens
Y51 (2015)
-
Features
iQOO Z11x
LED flash, HDR, panorama
Y51 (2015)
LED flash, HDR, panorama
Video
iQOO Z11x
4K@30fps, 1080p@30fps, gyro-EIS
Y51 (2015)
1080p@30fps
Single
iQOO Z11x
-
Y51 (2015)
8 MP, AF
Single
iQOO Z11x
32 MP, (wide)
Y51 (2015)
5 MP
Video
iQOO Z11x
4K@30fps, 1080p@30fps
Y51 (2015)
720p@30fps
Loudspeaker
iQOO Z11x
Yes, with stereo speakers
Y51 (2015)
Yes
3.5mm jack
iQOO Z11x
No
Y51 (2015)
Yes
WLAN
iQOO Z11x
Wi-Fi 802.11 a/b/g/n/ac, dual-band
Y51 (2015)
Wi-Fi 802.11 b/g/n, hotspot
Bluetooth
iQOO Z11x
5.4, A2DP, LE
Y51 (2015)
4.0, A2DP
Positioning
iQOO Z11x
GPS, GALILEO, GLONASS, BDS, QZSS
Y51 (2015)
GPS, GLONASS, BDS
NFC
iQOO Z11x
No
Y51 (2015)
No
Radio
iQOO Z11x
No
Y51 (2015)
FM radio
USB
iQOO Z11x
USB Type-C 2.0, OTG
Y51 (2015)
microUSB 2.0
Sensors
iQOO Z11x
Fingerprint (side-mounted), accelerometer, gyro, proximity, compass
Y51 (2015)
Accelerometer, proximity, compass
Type
iQOO Z11x
Si/C Li-Ion 7200 mAh
Y51 (2015)
Li-Ion 2350 mAh, non-removable
Charging
iQOO Z11x
44W wired, PPS, 50% in 43 min Reverse wired Bypass Charging
Y51 (2015)
-
Colors
iQOO Z11x
Prismatic Green, Titan Black
Y51 (2015)
White
Models
iQOO Z11x
I2507
Y51 (2015)
Y51L, Y51, 1707, Y51A
Price
iQOO Z11x
-
Y51 (2015)
About 130 EUR