Intel Core i5-1235U vs Intel Core i7-1255U

CPU comparison with benchmarks

Intel Core i5-1235U		Intel Core i7-1255U
CPU comparison Intel Core i5-1235U or Intel Core i7-1255U - which processor is faster? In this comparison we look at the differences and analyze which of these two CPUs is better. We compare the technical data and benchmark results. The Intel Core i5-1235U has 10 cores with 12 threads and clocks with a maximum frequency of 4.40 GHz. Up to 64 GB of memory is supported in 2 memory channels. The Intel Core i5-1235U was released in Q1/2022. The Intel Core i7-1255U has 10 cores with 12 threads and clocks with a maximum frequency of 4.70 GHz. The CPU supports up to 64 GB of memory in 2 memory channels. The Intel Core i7-1255U was released in Q1/2022.
Intel Core i5 (336)	Family	Intel Core i7 (300)
Intel Core i 1200P/1200U (21)	CPU group	Intel Core i 1200P/1200U (21)
12	Generation	12
Alder Lake U	Architecture	Alder Lake U
Notebook	Segment	Notebook
--	Predecessor	--
Intel Core i5-1335U	Successor	Intel Core i7-1355U
CPU Cores and Base Frequency The Intel Core i5-1235U is a 10 core processor with a clock frequency of 1.30 GHz (4.40 GHz). The Intel Core i7-1255U has 10 CPU cores with a clock frequency of 1.70 GHz (4.70 GHz).
Intel Core i5-1235U	Characteristic	Intel Core i7-1255U
10	Cores	10
12	Threads	12
hybrid (big.LITTLE)	Core architecture	hybrid (big.LITTLE)
Yes	Hyperthreading	Yes
No	Overclocking ?	No
1.30 GHz (4.40 GHz) 2x Golden Cove	A-Core	1.70 GHz (4.70 GHz) 2x Golden Cove
0.90 GHz (3.30 GHz) 8x Gracemont	B-Core	1.20 GHz (3.50 GHz) 8x Gracemont
NPU AI performance The performance values of the processor's AI unit. The isolated NPU performance is specified here, the total AI performance (NPU+CPU+iGPU) can be higher. Processors with support for artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors.
Intel Core i5-1235U	Characteristic	Intel Core i7-1255U
--	AI hardware	--
--	AI specifications	--
--	NPU + CPU + iGPU	--
Integrated graphics (iGPU) The integrated graphics unit of a processor is not only responsible for the pure image output on the system, but can also significantly increase the efficiency of the system with the support of modern video codecs.
Intel Iris Xe Graphics 80 (Alder Lake)	GPU	Intel Iris Xe Graphics 96 (Alder Lake)
0.35 GHz	GPU frequency	0.35 GHz
1.20 GHz	GPU (Turbo)	1.25 GHz
13	GPU Generation	13
10 nm	Technology	10 nm
4	Max. displays	4
80	Compute units	96
640	Shader	768
No	Hardware Raytracing	No
No	Frame Generation	No
32 GB	Max. GPU Memory	32 GB
12.1	DirectX Version	12.1
Hardware codec support A photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos.
Intel Iris Xe Graphics 80 (Alder Lake)	GPU	Intel Iris Xe Graphics 96 (Alder Lake)
Decode / Encode	Codec h265 / HEVC (8 bit)	Decode / Encode
Decode / Encode	Codec h265 / HEVC (10 bit)	Decode / Encode
Decode / Encode	Codec h264	Decode / Encode
Decode / Encode	Codec VP9	Decode / Encode
Decode	Codec VP8	Decode
Decode	Codec AV1	Decode
Decode / Encode	Codec AVC	Decode / Encode
Decode	Codec VC-1	Decode
Decode / Encode	Codec JPEG	Decode / Encode

Memory & PCIe The Intel Core i5-1235U supports a maximum of 64 GB of memory in 2 memory channels. The Intel Core i7-1255U can connect up to 64 GB of memory in 2 memory channels.
Intel Core i5-1235U	Characteristic	Intel Core i7-1255U
LPDDR5-5200, LPDDR4X-4266, DDR5-4800, DDR4-3200	Memory	LPDDR5-5200, LPDDR4X-4266, DDR5-4800, DDR4-3200
64 GB	Max. Memory	64 GB
2 (Dual Channel)	Memory channels	2 (Dual Channel)
83.2 GB/s	Max. Bandwidth	83.2 GB/s
No	ECC	No
6.50 MB	L2 Cache	6.50 MB
12.00 MB	L3 Cache	12.00 MB
4.0	PCIe version	4.0
28	PCIe lanes	28
55.1 GB/s	PCIe Bandwidth	55.1 GB/s
Thermal Management The TDP (Thermal Design Power) of a processor specifies the required cooling solution. The Intel Core i5-1235U has a TDP of 15 W, that of the Intel Core i7-1255U is 15 W.
Intel Core i5-1235U	Characteristic	Intel Core i7-1255U
15 W	TDP (PL1 / PBP)	15 W
55 W	TDP (PL2)	55 W
--	TDP up	--
--	TDP down	--
100 °C	Tjunction max.	100 °C
Technical details The Intel Core i5-1235U has a 18.50 MB cache, while the Intel Core i7-1255U cache has a total of 18.50 MB.
Intel Core i5-1235U	Characteristic	Intel Core i7-1255U
10 nm	Technology	10 nm
Monolithic	Chip design	Monolithic
x86-64 (64 bit)	Instruction set (ISA)	x86-64 (64 bit)
SSE4.1, SSE4.2, AVX2	ISA extensions	SSE4.1, SSE4.2, AVX2
BGA 1744	Socket	BGA 1744
VT-x, VT-x EPT, VT-d	Virtualization	VT-x, VT-x EPT, VT-d
Yes	AES-NI	Yes
Windows 10, Windows 11, Linux	Operating systems	Windows 10, Windows 11, Linux
Q1/2022	Release date	Q1/2022
--	Release price	--
show more data		show more data
Intel Core i5-1235U 10C 12T @ 1.30 GHz (4.40 GHz) buy now on Amazon and save! Intel Core i7-1255U 10C 12T @ 1.70 GHz (4.70 GHz) buy now on Amazon and save!

Devices using this processor
Intel Core i5-1235U	Intel Core i7-1255U
HP 250 G9 (2022) HP Pavilion 15-eg2000sf	Unknown

Comparison of the two processors

The main difference between the Intel Core i5-1235U and the Intel Core i7-1255U is the clock frequency. Both processors have 10 CPU cores, which are designed according to the big.LITTLE principle. Two "Golden Cove" P-cores are complemented by 8 "Gracemont" E-cores.

The P cores in the Intel Core i5-1235U clock at 1.3 GHz in the base. The clock frequency in turbo mode can reach 4.4 GHz. In the Intel Core i7-1255U, the clock frequencies are 300 MHz higher at 1.7 GHz (4.7 GHz Turbo). The E cores clock at 0.9 GHz (maximum 3.3 GHz) in the Intel Core i5-1235U and at 1.2 GHz (3.5 GHz Turbo) a little lower.

Since the two "Golden Cove" CPU cores support Hyperthreading, they can each process 2 tasks simultaneously per CPU core, so both processors have a maximum of 12 simultaneous threads.

In addition to the differences in the clock frequency, the Intel Core i5-1235U and the Intel Core i7-1255U also differ in the iGPU used. The internal graphics unit of the Intel Core i5-1235U is the Intel Iris Xe graphics with 80 execution units and 640 texture shaders. The Intel Core i7-1255U uses the Intel Iris Xe graphics with 96 execution units (768 texture shaders), the largest expansion stage of the Intel Xe iGPUs. This is almost 30 percent faster than the 80-execution-unit Intel Iris Xe graphics used in the Intel Core i5-1235U.

The raw performance of the Intel Iris Xe 80 is 1.5 TFLOPS (FP32), while the Intel Iris Xe 96 of the Intel Core i7-1255U comes in at 1.9 TFLOPS (FP32). Both graphics cards are suitable for simple games or for image and video processing. TOP AAA games still require a dedicated graphics card.

Both processors support up to 64 GB of RAM. For example, DDR5-4800 or LPDDR5-5200 is supported. The maximum memory bandwidth is 76.8 GB/s. This is a very good value for a fairly frugal mobile processor.

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