Notebookcheck Logo

Intel Core Ultra 7 255HX vs Intel Core Ultra 7 255H

Intel Core Ultra 7 255HX

► remove from comparison Intel Ultra 7 255HX

The Intel Core Ultra 7 255HX is a mobile high-end CPU for gaming notebooks based on the Arrow Lake architecture. It offers 20 cores consisting of 8 fast performance cores with up to 5.2 GHz and 12 of the 16 smaller efficiency cores with up to 4.5 GHz clock speed. The CPU has access to 30 MB L2 cache and 36 MB L3 cache and is specified with a TDP of 55 watts.

The SoC integrates a small dedicated NPU called AI Boost with 13 TOPS (Int8) and optionally supports vPro Essentials. The integrated memory controller supports up to 192 GB DDR5-6400 (dual channel, ECC optional). The integrated GPU (iGPU) is a small Intel Graphics graphics card with four Xe cores running at 300 - 1850 MHz.

Performance - High End

Thanks to the improved IPC of the cores (especially the efficiency cores), the CPU should perform just behind or at the level of the Raptor Lake Core i9-14700HX (8 + 12 cores, max 5.5 / 3.9 GHz). This makes the CPU ideal for demanding tasks such as high-end gaming and content creation.

Production - TSMC and Foveros

The Arrow Lake-HX chips are based on the desktop Arrow Lake-S chips and are composed of several chiplets. The CPU part is manufactured at TSMC in the modern N3B (3nm) process, the GPU also comes from TSMC in the N5P process. The SoC and I/O tile are manufactured in the TSMC N6 process. The base tile is manufactured by Intel in the 22nm process and carries the individual chiplets thanks to Fovero's 3D packaging.

Intel Core Ultra 7 255H

► remove from comparison Intel Ultra 7 255H

The Intel Core Ultra 7 255H is a mobile high-end CPU for larger notebooks based on the Arrow Lake architecture. It offers 16 cores consisting of 6 fast performance cores (Lion Cove) with up to 5.1 GHz and 8 smaller efficiency cores (Skymont) with up to 4.4 GHz clock speed and two additional "low power" efficiency cores with up to 2.5 GHz (Skymont). The CPU has access to 24 MB of cache and is specified with a TDP of 28 watt (PL1, 115W PL2).

The SoC integrates a small dedicated NPU called AI Boost with 13 TOPS (Int8) and optionally supports vPro Essentials. The integrated memory controller supports up to 192 GB LPDDR5/x-8400 or DDR5-6400 (dual channel). The integrated GPU (iGPU) is an Intel Arc 140T graphics card which offers eight Xe cores with up to 2.25 GHz.

Performance - High End

The Core Ultra 7 is superior to the top model Core Ultra 9 285H as only the maximum Turbo frequency is 200 MHz lower. Due to the improved IPC of the cores (especially the efficiency cores), the CPU should perform slightly below the level of the old Raptor Lake Core Core 9 270H (6 + 8 cores, max 5.8 / 4.1 GHz). This makes the CPU very suitable for demanding tasks such as high-end gaming and content creation.

Chiplet design

Like the desktop and HX chips, the Arrow Lake-H chips are based on individual chiplets that are placed on a 22nm base tile from Intel using Foveros 3D packaging. The CPU part comes from TSMC using the modern N3B (3nm) process. As with HX, the GPU also is produced at TSMC and is manufactured using the N5P process. SoC and I/O Tile are also from TSMC but in the older N6 process.

ModelIntel Core Ultra 7 255HXIntel Core Ultra 7 255H
CodenameArrow Lake-HXArrow Lake-H
SeriesIntel Arrow LakeIntel Arrow Lake
Series: Arrow Lake Arrow Lake-H
Intel Core Ultra 9 285HX compare2.1 - 5.5 GHz24 / 24 cores36 MB L3
Intel Core Ultra 9 275HX compare2.1 - 5.4 GHz24 / 24 cores36 MB L3
Intel Core Ultra 7 265HX compare2.3 - 5.3 GHz20 / 20 cores36 MB L3
Intel Core Ultra 7 255HX « 2.3 - 5.2 GHz20 / 20 cores36 MB L3
Intel Core Ultra 5 245HX compare2.6 - 5.1 GHz14 / 14 cores26 MB L3
Intel Core Ultra 5 235HX compare2.6 - 5.1 GHz14 / 14 cores26 MB L3
Intel Core Ultra 9 285H compare4.5 - 5.4 GHz16 / 16 cores24 MB L3
Intel Core Ultra 7 265H compare4.5 - 5.3 GHz16 / 16 cores24 MB L3
Intel Core Ultra 7 255H « 4.4 - 5.1 GHz16 / 16 cores24 MB L3
Intel Core Ultra 5 235H compare4.4 - 5.1 GHz14 / 14 cores18 MB L3
Intel Core Ultra 5 225H compare4.3 - 4.9 GHz14 / 14 cores18 MB L3
Clock2300 - 5200 MHz4400 - 5100 MHz
L2 Cache30 MB26 MB
L3 Cache36 MB24 MB
Cores / Threads20 / 20
8 x 5.2 GHz Intel Lion Cove P-Core
12 x 4.5 GHz Intel Skymont E-Core
16 / 16
6 x 5.1 GHz Intel Lion Cove P-Core
8 x 4.4 GHz Intel Skymont E-Core
2 x 2.5 GHz Intel Crestmont E-Core
TDP55 Watt28 Watt
TDP Turbo PL2160 Watt115 Watt
Technology3 nm3 nm
iGPUIntel Graphics 4-Core iGPU (Meteor / Arrow Lake) (300 - 1850 MHz)Intel Arc Graphics 140T ( - 2250 MHz)
NPU / AI13 TOPS INT813 TOPS INT8
Chip AI33 TOPS INT896 TOPS INT8
Architecturex86x86
Announced
Manufacturerwww.intel.comark.intel.com
max. Temp.110 °C
$514 U.S.

Benchmarks

Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU - Ultra 7 255HX
46.9 pt (78%)
Restrict / Search: Model: Max. age: years
Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU - Ultra 7 255H
42.1 pt (70%)
Restrict / Search: Model: Max. age: years
Cinebench 2024 - Cinebench 2024 CPU Single Core
min: 124     avg: 128.9     median: 130.1 (65%)     max: 131.6 Points
min: 119     avg: 123.6     median: 123.5 (62%)     max: 128.1 Points
Cinebench 2024 - Cinebench 2024 CPU Multi Core
min: 1500     avg: 1665     median: 1700.5 (32%)     max: 1758 Points
min: 750     avg: 973     median: 950 (18%)     max: 1197 Points
Cinebench R23 - Cinebench R23 Multi Core
min: 27129     avg: 31781     median: 32612 (30%)     max: 34005 Points
min: 16105     avg: 18399     median: 17812 (17%)     max: 22578 Points
Cinebench R23 - Cinebench R23 Single Core
min: 2111     avg: 2154     median: 2163 (88%)     max: 2171 Points
min: 1874     avg: 2061     median: 2079 (85%)     max: 2152 Points
Cinebench R20 - Cinebench R20 CPU (Single Core)
min: 822     avg: 831     median: 832 (91%)     max: 835 Points
min: 748     avg: 793     median: 801.5 (87%)     max: 826 Points
Cinebench R20 - Cinebench R20 CPU (Multi Core)
min: 10626     avg: 12350     median: 12839 (31%)     max: 13056 Points
min: 6356     avg: 7221     median: 6973.5 (17%)     max: 8860 Points
Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 4114     avg: 4807     median: 4916 (31%)     max: 5190 Points
min: 2414     avg: 2836     median: 2815.5 (18%)     max: 3444 Points
Cinebench R15 - Cinebench R15 CPU Single 64 Bit
min: 322     avg: 326     median: 327 (91%)     max: 328 Points
min: 258     avg: 304.7     median: 309 (86%)     max: 322 Points
Cinebench R11.5 - Cinebench R11.5 CPU Multi 64 Bit
50.3 Points (65%)
31.3 Points (41%)
Cinebench R11.5 - Cinebench R11.5 CPU Single 64 Bit
4 Points (94%)
3.8 Points (90%)
Cinebench R10 - Cinebench R10 Rend. Single (32bit)
11779 Points (71%)
11500 Points (69%)
Cinebench R10 - Cinebench R10 Rend. Multi (32bit)
81019 Points (59%)
65269 Points (47%)
Cinebench R10 - Cinebench R10 Rend. Multi (64bit)
96508 Points (62%)
Cinebench R10 - Cinebench R10 Rend. Single (64bit)
17883 Points (22%)
wPrime 2.10 - wPrime 2.0 1024m *
319.3 s (4%)
wPrime 2.10 - wPrime 2.0 32m *
3.6 s (1%)
WinRAR - WinRAR 4.0
10319 Points (16%)
7777 Points (12%)
7-Zip 18.03 - 7-Zip 18.03 Multi Thread 4 runs
min: 87806     avg: 98362     median: 98675 (57%)     max: 104055 MIPS
min: 42155     avg: 57634     median: 56815 (33%)     max: 68652 MIPS
7-Zip 18.03 - 7-Zip 18.03 Single Thread 4 runs
min: 6407     avg: 6494     median: 6515 (77%)     max: 6576 MIPS
min: 4589     avg: 5855     median: 5963 (70%)     max: 6385 MIPS
X264 HD Benchmark 4.0 - x264 Pass 2
215.6 fps (5%)
154.7 fps (4%)
X264 HD Benchmark 4.0 - x264 Pass 1
385.3 fps (10%)
354.5 fps (9%)
HWBOT x265 Benchmark v2.2 - HWBOT x265 4k Preset
min: 30.4     avg: 34.4     median: 35 (62%)     max: 36.9 fps
min: 13.7     avg: 20.7     median: 20.9 (37%)     max: 26.5 fps
TrueCrypt - TrueCrypt Serpent
1.8 GB/s (53%)
1.1 GB/s (32%)
TrueCrypt - TrueCrypt Twofish
3.6 GB/s (62%)
1.8 GB/s (31%)
TrueCrypt - TrueCrypt AES
10.8 GB/s (28%)
8.3 GB/s (22%)
Blender - Blender 3.3 Classroom CPU *
min: 171     avg: 178.8     median: 173 (2%)     max: 198 Seconds
min: 256     avg: 343.2     median: 332 (4%)     max: 492 Seconds
Blender - Blender 2.79 BMW27 CPU *
min: 104     avg: 109.6     median: 106 (1%)     max: 122 Seconds
min: 157     avg: 206.6     median: 199.5 (1%)     max: 293 Seconds
R Benchmark 2.5 - R Benchmark 2.5 *
min: 0.4209     avg: 0.4     median: 0.4 (9%)     max: 0.4287 sec
min: 0.4233     avg: 0.4     median: 0.4 (9%)     max: 0.515 sec
3DMark 06 - CPU - 3DMark 06 - CPU
17993 Points (38%)
min: 14666     avg: 14844     median: 14843.5 (32%)     max: 15021 Points
Super Pi mod 1.5 XS 1M - Super Pi mod 1.5 XS 1M *
7.3 s (2%)
7.5 s (2%)
Super Pi mod 1.5 XS 2M - Super Pi mod 1.5 XS 2M *
16 s (1%)
16.5 s (1%)
Super Pi Mod 1.5 XS 32M - Super Pi mod 1.5 XS 32M *
375 s (2%)
3DMark Vantage - 3DM Vant. Perf. CPU no Physx
min: 79410     avg: 80381     median: 80381 (62%)     max: 81352 Points
3DMark 11 - 3DM11 Performance Physics
min: 22207     avg: 24974     median: 25725 (63%)     max: 26551 Points
min: 17409     avg: 21142     median: 20853 (51%)     max: 24715 Points
3DMark - 3DMark Ice Storm Physics
min: 106965     avg: 111352     median: 111352 (90%)     max: 115738 Points
3DMark - 3DMark Ice Storm Extreme Physics
min: 106511     avg: 111384     median: 111384 (90%)     max: 116256 Points
3DMark - 3DMark Ice Storm Unlimited Physics
min: 108898     avg: 112983     median: 112983 (91%)     max: 117068 Points
3DMark - 3DMark Cloud Gate Physics
min: 21049     avg: 24189     median: 25249 (64%)     max: 26269 Points
min: 13466     avg: 19590     median: 19835.5 (50%)     max: 23195 Points
3DMark - 3DMark Fire Strike Standard Physics
min: 36734     avg: 43889     median: 44354 (79%)     max: 47833 Points
min: 22456     avg: 30609     median: 29389 (52%)     max: 37837 Points
3DMark - 3DMark Time Spy CPU
min: 14763     avg: 16072     median: 16437 (69%)     max: 17010 Points
min: 6177     avg: 11207     median: 11307 (48%)     max: 13757 Points
Geekbench 6.5 - Geekbench 6.5 Single-Core
min: 2917     avg: 2959     median: 2951 (68%)     max: 3028 Points
min: 2712     avg: 2846     median: 2866 (66%)     max: 2925 Points
Geekbench 6.5 - Geekbench 6.5 Multi-Core
min: 16396     avg: 17915     median: 17976 (70%)     max: 19623 Points
min: 11979     avg: 15219     median: 14990 (58%)     max: 17489 Points
Geekbench 5.5 - Geekbench 5.1 - 5.5 64 Bit Single-Core
min: 2112     avg: 2172     median: 2182 (73%)     max: 2211 Points
min: 1938     avg: 2045     median: 2045 (69%)     max: 2121 Points
Geekbench 5.5 - Geekbench 5.1 - 5.5 64 Bit Multi-Core
min: 18263     avg: 19710     median: 19643 (35%)     max: 21014 Points
min: 11348     avg: 14627     median: 14330.5 (26%)     max: 17218 Points
Geekbench 5.0 - Geekbench 5.0 64 Bit Single-Core
2094 Points (9%)
Geekbench 5.0 - Geekbench 5.0 64 Bit Multi-Core
13465 Points (42%)
Geekbench 4.4 - Geekbench 4.1 - 4.4 64 Bit Single-Core
8697 Points (87%)
Geekbench 4.4 - Geekbench 4.1 - 4.4 64 Bit Multi-Core
50379 Points (49%)
Geekbench 4.0 - Geekbench 4.0 64 Bit Single-Core
9053 Points (100%)
Geekbench 4.0 - Geekbench 4.0 64 Bit Multi-Core
69317 Points (91%)
Mozilla Kraken 1.1 - Kraken 1.1 Total Score *
min: 423     avg: 427.6     median: 425 (0%)     max: 436 ms
min: 427     avg: 455.4     median: 454 (1%)     max: 510 ms
Octane V2 - Octane V2 Total Score
114864 Points (76%)
min: 112005     avg: 117358     median: 117689 (78%)     max: 122048 Points
WebXPRT 4 - WebXPRT 4 Score
min: 305     avg: 313.4     median: 313 (82%)     max: 326 Points
min: 247     avg: 291.7     median: 298 (78%)     max: 317 Points
WebXPRT 3 - WebXPRT 3 Score
min: 317     avg: 328     median: 325 (58%)     max: 344 Points
min: 273     avg: 310.6     median: 313 (56%)     max: 331 Points
CrossMark - CrossMark Overall
min: 1944     avg: 2044     median: 2059 (77%)     max: 2097 Points
min: 1610     avg: 1898     median: 1935.5 (72%)     max: 2058 Points
Power Consumption - Prime95 Power Consumption - external Monitor *
min: 156.1     avg: 183.4     median: 172.3 (30%)     max: 226 Watt
min: 40.3     avg: 79.1     median: 59.2 (10%)     max: 142.9 Watt
Power Consumption - Cinebench R15 Multi Power Consumption - external Monitor *
min: 174.2     avg: 208.1     median: 223 (41%)     max: 227 Watt
min: 59.7     avg: 91.9     median: 69.9 (13%)     max: 168 Watt
Power Consumption - Idle Power Consumption - external Monitor *
min: 9.33     avg: 21.4     median: 25.2 (17%)     max: 32.4 Watt
min: 3.5     avg: 7.9     median: 7.7 (5%)     max: 15.4 Watt
Power Consumption - Idle Power Consumption 150cd 1min *
min: 10.1     avg: 14.4     median: 12.4 (9%)     max: 20.7 Watt
min: 3.6     avg: 18.5     median: 9 (7%)     max: 137.5 Watt
Power Consumption - Power Efficiency - Cinebench R15 Multi external Monitor
min: 22.1     avg: 22.7     median: 22.7 (17%)     max: 23.3 Points per Watt
min: 20.5     avg: 34.2     median: 39.5 (29%)     max: 43.2 Points per Watt

Average Benchmarks Intel Core Ultra 7 255HX → 100% n=40

Average Benchmarks Intel Core Ultra 7 255H → 79% n=40

- Range of benchmark values for this graphics card
red legend - Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

Add one or more devices and compare

In the following list you can select (and also search for) devices that should be added to the comparison. You can select more than one device.

restrict list:
v1.35
log 05. 00:11:17

#0 ran 0s before starting gpusingle class +0s ... 0s

#1 checking url part for id 18892 +0s ... 0s

#2 checking url part for id 18903 +0s ... 0s

#3 redirected to Ajax server, took 1767568277s time from redirect:0 +0s ... 0s

#4 did not recreate cache, as it is less than 5 days old! Created at Sun, 04 Jan 2026 05:18:32 +0100 +0s ... 0s

#5 composed specs +0.006s ... 0.006s

#6 did output specs +0s ... 0.006s

#7 getting avg benchmarks for device 18892 +0.004s ... 0.01s

#8 got single benchmarks 18892 +0.01s ... 0.02s

#9 getting avg benchmarks for device 18903 +0.004s ... 0.024s

#10 got single benchmarks 18903 +0.021s ... 0.045s

#11 got avg benchmarks for devices +0s ... 0.045s

#12 min, max, avg, median took s +0.05s ... 0.095s

#13 return log +0.002s ... 0.097s

Please share our article, every link counts!
Mail Logo
Google Logo Add as a preferred
source on Google
> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > Benchmarks / Tech > Processor Comparison - Head 2 Head
Redaktion, 2017-09- 8 (Update: 2023-07- 1)