i7-1255U vs Celeron 3865U

Place in the ranking	2575	878
Place by popularity	not in top-100	37
Market segment	Laptop	Laptop
Series	Intel Celeron	Intel Alder Lake-M
Power efficiency	5.23	53.98
Architecture codename	Kaby Lake-U (2017)	Alder Lake-U (2022)
Release date	3 January 2017 (7 years ago)	23 February 2022 (2 years ago)
Launch price (MSRP)	$107	no data

Detailed specifications

Celeron 3865U 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	2 (Dual-core)	10 (Deca-Core)
Threads	2	12
Base clock speed	1.8 GHz	1.7 GHz
Boost clock speed	1.8 GHz	4.7 GHz
Bus type	OPI	no data
Bus rate	4 GT/s	no data
Multiplier	22	no data
L1 cache	128 KB	80K (per core)
L2 cache	512 KB	1.25 MB (per core)
L3 cache	2 MB (shared)	12 MB (shared)
Chip lithography	14 nm	Intel 7 nm
Die size	98.7 mm²	no data
Maximum core temperature	100 °C	100 °C
64 bit support	+	+
Windows 11 compatibility	-	+

Compatibility

Information on Celeron 3865U 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	FCBGA1356,FPBGA1356	FCBGA1744
Power consumption (TDP)	15 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron 3865U and Core i7-1255U. You'll probably need this information if you require some particular technology.

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

Security technologies

Celeron 3865U and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	+
EDB	+	+
Secure Key	+	+
MPX	+	-
SGX	Yes with Intel® ME	no data
OS Guard	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Celeron 3865U and Core i7-1255U are enumerated here.

AMD-V	+	-
VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron 3865U and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3, DDR4	DDR4, DDR5
Maximum memory size	32 GB	64 GB
Max memory channels	2	2
Maximum memory bandwidth	34.134 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics 610	Intel® Iris® Xe Graphics eligible
Max video memory	32 GB	no data
Quick Sync Video	+	+
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	900 MHz	1.25 GHz
Execution Units	no data	96

Graphics interfaces

Available interfaces and connections of Celeron 3865U and Core i7-1255U integrated GPUs.

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

Graphics image quality

Maximum display resolutions supported by Celeron 3865U and Core i7-1255U integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2304@24Hz	4096 x 2304 @ 60Hz
Max resolution over eDP	4096x2304@60Hz	4096 x 2304 @ 120Hz
Max resolution over DisplayPort	4096x2304@60Hz	7680 x 4320 @ 60Hz

Graphics API support

APIs supported by Celeron 3865U and Core i7-1255U integrated GPUs, sometimes API versions are included.

DirectX	12	12.1
OpenGL	4.4	4.6

Peripherals

Specifications and connection of peripherals supported by Celeron 3865U and Core i7-1255U.

PCIe version	2.0	4.0
PCI Express lanes	16	20

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 3865U 0.86

i7-1255U 8.88
+933%

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 3865U 1321

i7-1255U 13583
+928%

Cinebench 15 64-bit multi-core

Cinebench Release 15 Multi Core is a variant of Cinebench R15 which uses all the processor threads.

Celeron 3865U 142

i7-1255U 1389
+878%

Cinebench 15 64-bit single-core

Cinebench R15 (standing for Release 15) is a benchmark made by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version (sometimes called Single-Thread) only uses a single processor thread to render a room full of reflective spheres and light sources.

Celeron 3865U 72

i7-1255U 238
+231%