i7-1255U vs Celeron J3455

Place in the ranking	2205	895
Place by popularity	not in top-100	74
Cost-effectiveness evaluation	0.22	no data
Market segment	Desktop processor	Laptop
Series	Intel Celeron	Intel Alder Lake-M
Power efficiency	13.44	53.75
Architecture codename	Apollo Lake (2014−2016)	Alder Lake-U (2022)
Release date	30 August 2016 (8 years ago)	23 February 2022 (2 years ago)
Launch price (MSRP)	$107	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Detailed specifications

Celeron J3455 and Core i7-1255U basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores	4 (Quad-Core)	10 (Deca-Core)
Threads	4	12
Base clock speed	1.5 GHz	1.7 GHz
Boost clock speed	2.3 GHz	4.7 GHz
Multiplier	15	no data
L1 cache	no data	80K (per core)
L2 cache	2 MB	1.25 MB (per core)
L3 cache	0 KB	12 MB (shared)
Chip lithography	14 nm	Intel 7 nm
Maximum core temperature	105 °C	100 °C
64 bit support	+	+
Windows 11 compatibility	-	+

Compatibility

Information on Celeron J3455 and Core i7-1255U compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration	1 (Uniprocessor)	1
Socket	FCBGA1296	FCBGA1744
Power consumption (TDP)	10 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron J3455 and Core i7-1255U. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
FMA	-	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	+
TSX	-	+
Idle States	+	no data
Thermal Monitoring	+	+
Flex Memory Access	no data	+
Smart Response	-	no data
GPIO	+	no data
Smart Connect	-	no data
HD Audio	+	no data
RST	-	no data
Deep Learning Boost	-	+

Security technologies

Celeron J3455 and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Boot	+	no data
Secure Key	+	+
Identity Protection	+	-
OS Guard	-	+
Anti-Theft	-	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Celeron J3455 and Core i7-1255U are enumerated here.

VT-d	+	+
VT-x	+	+
VT-i	-	no data
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron J3455 and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3L/LPDDR3 up to 1866 MT/s; LPDDR4 up to 2400 MT/s	DDR4, DDR5
Maximum memory size	8 GB	64 GB
Max memory channels	2	2

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics 500	Intel® Iris® Xe Graphics eligible
Max video memory	8 GB	no data
Quick Sync Video	+	+
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	750 MHz	1.25 GHz
Execution Units	12	96

Graphics interfaces

Available interfaces and connections of Celeron J3455 and Core i7-1255U integrated GPUs.

Number of displays supported	3	4
eDP	+	no data
DisplayPort	+	-
HDMI	+	-
MIPI-DSI	+	no data

Graphics image quality

Maximum display resolutions supported by Celeron J3455 and Core i7-1255U integrated GPUs, including resolutions over different interfaces.

Max resolution over HDMI 1.4	no data	4096 x 2304 @ 60Hz
Max resolution over eDP	no data	4096 x 2304 @ 120Hz
Max resolution over DisplayPort	no data	7680 x 4320 @ 60Hz

Graphics API support

APIs supported by Celeron J3455 and Core i7-1255U integrated GPUs, sometimes API versions are included.

DirectX	+	12.1
OpenGL	+	4.6

Peripherals

Specifications and connection of peripherals supported by Celeron J3455 and Core i7-1255U.

PCIe version	2.0	4.0
PCI Express lanes	6	20
USB revision	2.0/3.0	no data
Total number of SATA ports	2	no data
Max number of SATA 6 Gb/s Ports	2	no data
Number of USB ports	8	no data
Integrated LAN	-	no data
UART	+	no data

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Celeron J3455 1.42

i7-1255U 8.52
+500%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Celeron J3455 2256

i7-1255U 13538
+500%

Gaming performance

Pros & cons summary

Performance score	1.42	8.52
Recency	30 August 2016	23 February 2022
Physical cores	4	10
Threads	4	12
Power consumption (TDP)	10 Watt	15 Watt

Celeron J3455 has 50% lower power consumption.

i7-1255U, on the other hand, has a 500% higher aggregate performance score, an age advantage of 5 years, and 150% more physical cores and 200% more threads.

The Core i7-1255U is our recommended choice as it beats the Celeron J3455 in performance tests.

Note that Celeron J3455 is a desktop processor while Core i7-1255U is a notebook one.

Should you still have questions on choice between Celeron J3455 and Core i7-1255U, ask them in Comments section, and we shall answer.