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Intel Core i7-1355U vs Intel Core i7-1255U

Intel Core i7-1355U

► remove from comparison Intel i7-1355U

The Intel Core i7-1355U is a high-end mobile CPU for thin and light laptops based on the Alder Lake architecture (Raptor Lake-U / RPL-U series). It was announced in early 2023 and offers 2  performance cores (P-cores, Golden Cove architecture) and 8 efficient cores (E-cores, Gracemont architecture). The P-cores support Hyper-Threading leading to 12 supported threads when combined with the E-cores. The clock rate ranges from 1.7 to 5 GHz on the performance cluster and 1.2 to 3.7 GHz on the efficient cluster. The performance of the E-cores should be similar to old Skylake cores (compare to the Core i7-6700HQ). All cores can use up to 12 MB L3 cache. The CPU supports "Essentials" vPro management features. Compared to the P-series (28W) or H-series (45W), the 15W TDP may limit the sustained performance.

Performance

Thanks to the high clock speed, the Core i7-1355U should perform slightly better than the older core i7-1265U (up to 4.8 GHz). The faster i7 like the i7-1365U models offer only higher clock rates (and a faster iGPU).

Architecture

The integrated memory controller supports various memory types up to LPDDR5-6400. The Thread Director (in hardware) can support the operating system to decide which thread to use on the performance or efficient cores for the best performance. For AI tasks, the CPU also integrates GNA 3.0 and DL Boost (via AVX2). Quick Sync in version 8 is the same as in the Rocket Lake CPUs and supports MPEG-2, AVC, VC-1 decode, JPEG, VP8 decode, VP9, HEVC, and AV1 decode in hardware. The CPU still only supports PCIe 4.0 x8 for a GPU and two PCIe 4.0 x4 for SSDs.

The integrated graphics card is based on the Xe-architecture and offers all 96 EUs (Execution Units) operating at up to 1.3 GHz.

Power consumption

This Core i7 CPU is rated at a TDP of 15W (base power, PL1) and a maximum turbo power of 55W (PL2). The RPL-U processors are built in a further improved Intel 7 process (10nm SuperFin) that allows higher clock rates.

Intel Core i7-1255U

► remove from comparison Intel i7-1255U

The Intel Core i7-1255U is a high-end mobile CPU for thin and light laptops based on the Alder Lake architecture. It was announced in early 2022 and offers 2  performance cores (P-cores, Golden Cove architecture) and 8 efficient cores (E-cores, Gracemont architecture). The P-cores support Hyper-Threading leading to 12 supported threads when combined with the E-cores. The clock rate ranges from 1.7 to 4.7 GHz on the performance cluster and 1.2 to 3.5 GHz on the efficient cluster. The performance of the E-cores should be similar to old Skylake cores (compare to the Core i7-6700HQ). All cores can use up to 12 MB L3 cache. Compared to the i7-1265U (fastest U-series CPU at launch), the 1255 offers 100 MHz lower clocked CPU cores and only "Essentials" vPro management features. Compared to the P-series (28W) or H-series (45W), the 15W TDP may limit the sustained performance.

Performance

The average 1255U in our database is in the same league as the Ryzen 5 5600U, as far as multi-thread benchmark scores are concerned. Which is nothing to be ashamed of, as of mid 2023.

Thanks to its decent cooling solution and a long-term CPU power limit of 28 W, the Spectre x360 13.5 14t-ef000 is among the fastest laptops built around the 1255U that we know of. It can be 20% faster in CPU-bound workloads than the slowest system featuring the same chip in our database, as of August 2023.

Architecture

The integrated memory controller supports various memory types up to DDR5-4800, DDR4-3200, LPDDR5-5200, and LPDDR4x-4267. The Thread Director (in hardware) can support the operating system to decide which thread to use on the performance or efficient cores for the best performance. For AI tasks, the CPU also integrates GNA 3.0 and DL Boost (via AVX2). Quick Sync in version 8 is the same as in the Rocket Lake CPUs and supports MPEG-2, AVC, VC-1 decode, JPEG, VP8 decode, VP9, HEVC, and AV1 decode in hardware. The CPU only supports PCIe 4.0 (x8 for a GPU and two x4 for SSDs).

The integrated graphics card is based on the Xe-architecture and offers all 96 EUs (Execution Units) operating at up to 1.25 GHz.

Power consumption

This Core i7 has a "minimum assured" power consumption of 12 W. Its Base power consumption sits at 15 W and its maximum Intel-recommended Turbo power consumption isn't supposed to exceed 55 W. All those values are too high to allow for pasisvely cooled designs.

Last but not the least, Core i7-1255U is built with Intel's fourth-gen 10 nm process marketed as Intel 7 for decent, as of late 2022, energy efficiency.

ModelIntel Core i7-1355UIntel Core i7-1255U
SeriesIntel Raptor Lake-UIntel Alder Lake-M
CodenameRaptor Lake-UAlder Lake-U
Series: Alder Lake-M Alder Lake-U
Intel Core i7-1365U compare1.3 - 5.2 GHz10 / 12 cores12 MB L3
Intel Core i7-1355U « 1.2 - 5 GHz10 / 12 cores12 MB L3
Intel Core i5-1345U compare1.2 - 4.7 GHz10 / 12 cores12 MB L3
Intel Core i5-1335U compare0.9 - 4.6 GHz10 / 12 cores12 MB L3
Intel Core i5-1334U compare0.9 - 4.6 GHz10 / 12 cores12 MB L3
Intel Core i3-1315U compare0.9 - 4.5 GHz6 / 8 cores10 MB L3
Intel Core i3-1305U compare1.2 - 4.5 GHz5 / 6 cores10 MB L3
Intel Processor U300 compare0.9 - 4.4 GHz5 / 6 cores8 MB L3
Intel Core i7-1265U compare1.3 - 4.8 GHz10 / 12 cores12 MB L3
Intel Core i7-1255U « 1.2 - 4.7 GHz10 / 12 cores12 MB L3
Intel Core i5-1245U compare1.2 - 4.4 GHz10 / 12 cores12 MB L3
Intel Core i5-1235U compare0.9 - 4.4 GHz10 / 12 cores12 MB L3
Intel Core i7-1260U compare0.8 - 4.7 GHz10 / 12 cores12 MB L3
Intel Core i7-1250U compare0.8 - 4.7 GHz10 / 12 cores12 MB L3
Intel Core i5-1240U compare0.8 - 4.4 GHz10 / 12 cores12 MB L3
Intel Core i5-1230U compare0.7 - 4.4 GHz10 / 12 cores12 MB L3
Intel Core i3-1215U compare0.9 - 4.4 GHz6 / 8 cores10 MB L3
Intel Pentium 8505 compare0.9 - 4.4 GHz5 / 6 cores8 MB L3
Intel Core i3-1210U compare0.7 - 4.4 GHz6 / 8 cores10 MB L3
Intel Pentium 8500 compare0.7 - 4.4 GHz5 / 6 cores8 MB L3
Intel Celeron 7305 compare0.9 - 1.1 GHz5 / 5 cores8 MB L3
Intel Celeron 7300 compare0.7 - 1 GHz5 / 5 cores8 MB L3
Clock1200 - 5000 MHz1200 - 4700 MHz
L1 Cache928 KB928 KB
L2 Cache9.5 MB9.5 MB
L3 Cache12 MB12 MB
Cores / Threads10 / 12
2 x 5.0 GHz Intel Golden Cove P-Core
8 x 3.7 GHz Intel Gracemont E-Core
10 / 12
TDP15 Watt15 Watt
Technology10 nm10 nm
max. Temp.100 °C100 °C
SocketBGA1700BGA1744
FeaturesThread DirectorDDR4-3200/LPDDR4x-4266/DDR5-4800/LPDDR5-5200 RAM, PCIe 4, Thr. Dir., DL Boost, GNA, vPro Ess., MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, AVX2, BMI2, ABM, FMA, ADX, SMEP, SMAP, EIST, TM1, TM2, HT, Turbo, SST, AES-NI, RDRAND, RDSEED, SHA
iGPUIntel Iris Xe Graphics G7 96EUs ( - 1300 MHz)Intel Iris Xe Graphics G7 96EUs ( - 1250 MHz)
Architecturex86x86
Announced
Manufacturerwww.intel.comark.intel.com

Benchmarks

Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU - i7-1355U
39.5 pt (55%)
Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU - i7-1255U
37.9 pt (53%)
Cinebench 2024 - CB24 CPU Single Core
min: 102     avg: 105.4     median: 105.4 (73%)     max: 108.7 Points
Cinebench 2024 - CB24 CPU Multi Core
min: 398     avg: 430.5     median: 430.5 (8%)     max: 463 Points
Cinebench R23 - Cinebench R23 Multi Core
min: 6936     avg: 8613     median: 8286 (8%)     max: 10252 Points
min: 5269     avg: 8198     median: 8332 (8%)     max: 9628 Points
Cinebench R23 - Cinebench R23 Single Core
min: 1687     avg: 1807     median: 1825 (78%)     max: 1889 Points
min: 1425     avg: 1649     median: 1656 (70%)     max: 1775 Points
Cinebench R20 - Cinebench R20 CPU (Single Core)
min: 654     avg: 693     median: 697.5 (78%)     max: 725 Points
min: 550     avg: 635     median: 638 (71%)     max: 682 Points
Cinebench R20 - Cinebench R20 CPU (Multi Core)
min: 2849     avg: 3344     median: 3257.5 (8%)     max: 3907 Points
min: 2095     avg: 3116     median: 3131 (8%)     max: 3702 Points
Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 1206     avg: 1439     median: 1393 (9%)     max: 1735 Points
min: 919     avg: 1365     median: 1400 (9%)     max: 1577 Points
Cinebench R15 - Cinebench R15 CPU Single 64 Bit
min: 237     avg: 251.1     median: 255.5 (77%)     max: 264 Points
min: 161     avg: 229.4     median: 238.5 (72%)     max: 251 Points
Cinebench R11.5 - Cinebench R11.5 CPU Multi 64 Bit
16.5 Points (21%)
Cinebench R11.5 - Cinebench R11.5 CPU Single 64 Bit
3.1 Points (76%)
Cinebench R10 - Cinebench R10 Rend. Single (32bit)
10028 Points (61%)
Cinebench R10 - Cinebench R10 Rend. Multi (32bit)
33627 Points (24%)
wPrime 2.10 - wPrime 2.0 1024m *
885 s (10%)
wPrime 2.10 - wPrime 2.0 32m *
21 s (4%)
WinRAR - WinRAR 4.0
12688 Points (20%)
7-Zip 18.03 - 7-Zip 18.03 Multli Thread 4 runs
min: 30255     avg: 35884     median: 35321.5 (20%)     max: 41541 MIPS
min: 24126     avg: 34066     median: 36825 (21%)     max: 37365 MIPS
7-Zip 18.03 - 7-Zip 18.03 Single Thread 4 runs
min: 5301     avg: 5574     median: 5569.5 (67%)     max: 5911 MIPS
min: 5150     avg: 5308     median: 5256 (63%)     max: 5529 MIPS
HWBOT x265 Benchmark v2.2 - HWBOT x265 4k Preset
min: 7.83     avg: 9.4     median: 9.3 (16%)     max: 10.6 fps
min: 6.31     avg: 9.2     median: 9.7 (17%)     max: 10.1 fps
TrueCrypt - TrueCrypt Serpent
0.9 GB/s (28%)
TrueCrypt - TrueCrypt Twofish
1.7 GB/s (29%)
TrueCrypt - TrueCrypt AES
8.3 GB/s (22%)
Blender - Blender 3.3 Classroom CPU *
min: 628     avg: 797     median: 770.5 (10%)     max: 963 Seconds
min: 683     avg: 772     median: 723 (9%)     max: 1156 Seconds
Blender - Blender 2.79 BMW27 CPU *
min: 349     avg: 425.1     median: 424.5 (3%)     max: 503 Seconds
min: 372     avg: 419.7     median: 383 (3%)     max: 601 Seconds
R Benchmark 2.5 - R Benchmark 2.5 *
min: 0.4481     avg: 0.5     median: 0.5 (10%)     max: 0.832 sec
min: 0.4688     avg: 0.5     median: 0.5 (11%)     max: 0.558 sec
3DMark 06 - CPU - 3DMark 06 - CPU
min: 9944     avg: 10346     median: 10128 (22%)     max: 10965 Points
Super Pi mod 1.5 XS 1M - Super Pi mod 1.5 XS 1M *
6.7 s (1%)
Super Pi mod 1.5 XS 2M - Super Pi mod 1.5 XS 2M *
14.9 s (1%)
Super Pi Mod 1.5 XS 32M - Super Pi mod 1.5 XS 32M *
382.8 s (2%)
3DMark Vantage - 3DM Vant. Perf. CPU no Physx
37344 Points (33%)
3DMark 11 - 3DM11 Performance Physics
min: 9443     avg: 12658     median: 13043.5 (35%)     max: 16838 Points
min: 8097     avg: 14121     median: 15314 (41%)     max: 16890 Points
3DMark - 3DMark Ice Storm Physics
min: 72369     avg: 80648     median: 80647.5 (66%)     max: 88926 Points
3DMark - 3DMark Ice Storm Extreme Physics
73870 Points (60%)
3DMark - 3DMark Ice Storm Unlimited Physics
min: 72462     avg: 78502     median: 78502 (66%)     max: 84542 Points
3DMark - 3DMark Cloud Gate Physics
min: 8273     avg: 9800     median: 9617.5 (24%)     max: 11166 Points
min: 7665     avg: 10433     median: 10520 (27%)     max: 12522 Points
3DMark - 3DMark Fire Strike Standard Physics
min: 11630     avg: 16872     median: 17292.5 (31%)     max: 21248 Points
min: 11482     avg: 17380     median: 18157 (32%)     max: 20193 Points
3DMark - 3DMark Time Spy CPU
min: 4394     avg: 5886     median: 5713 (24%)     max: 8291 Points
min: 1124     avg: 5468     median: 6140 (26%)     max: 7649 Points
Geekbench 6.2 - Geekbench 6.2 Single-Core
min: 2348     avg: 2490     median: 2505 (76%)     max: 2595 Points
Geekbench 6.2 - Geekbench 6.2 Multi-Core
min: 8149     avg: 8894     median: 8908 (35%)     max: 9421 Points
Geekbench 5.5 - Geekbench 5.1 - 5.4 64 Bit Single-Core
min: 1678     avg: 1786     median: 1783 (75%)     max: 1872 Points
min: 1560     avg: 1640     median: 1650.5 (70%)     max: 1712 Points
Geekbench 5.5 - Geekbench 5.1 - 5.4 64 Bit Multi-Core
min: 7635     avg: 8174     median: 8058 (14%)     max: 9159 Points
min: 4463     avg: 7315     median: 7989.5 (14%)     max: 8821 Points
Geekbench 5.0 - Geekbench 5.0 64 Bit Single-Core
1786 Points (8%)
min: 1523     avg: 1607     median: 1610.5 (7%)     max: 1684 Points
Geekbench 5.0 - Geekbench 5.0 64 Bit Multi-Core
8018 Points (25%)
min: 4557     avg: 6900     median: 7294.5 (23%)     max: 8452 Points
Mozilla Kraken 1.1 - Kraken 1.1 Total Score *
min: 501     avg: 570     median: 514 (1%)     max: 1449 ms
min: 476.2     avg: 586     median: 571 (1%)     max: 727 ms
Sunspider - Sunspider 1.0 Total Score *
97.3 ms (1%)
Octane V2 - Octane V2 Total Score
min: 88682     avg: 90366     median: 90249 (81%)     max: 92531 Points
min: 75963     avg: 82625     median: 82948 (75%)     max: 88687 Points
WebXPRT 4 - WebXPRT 4 Score
min: 94.2     avg: 240.6     median: 253.5 (73%)     max: 263 Points
min: 183.4     avg: 230     median: 232 (67%)     max: 249 Points
WebXPRT 3 - WebXPRT 3 Score
min: 149.2     avg: 275.8     median: 284.5 (59%)     max: 297 Points
min: 200     avg: 274.6     median: 275 (57%)     max: 366 Points
PCMark for Android - PCM f. Android Storage 2.0 score
9895 Points (17%)
PCMark for Android - PCM f. Android Work Score 3.0
11617 Points (54%)
CrossMark - CrossMark Overall
min: 1478     avg: 1583     median: 1572.5 (60%)     max: 1794 Points
min: 1329     avg: 1461     median: 1475 (56%)     max: 1573 Points
CrXPRT 2 - CrXPRT2 Performance Score
173 Points (96%)
Power Consumption - Prime95 Power Consumption - external Monitor *
min: 27.2     avg: 39.2     median: 40.3 (7%)     max: 53.6 Watt
min: 24.3     avg: 43.1     median: 44 (8%)     max: 51.2 Watt
Power Consumption - Cinebench R15 Multi Power Consumption - external Monitor *
min: 40.2     avg: 51.3     median: 52.7 (10%)     max: 62.5 Watt
min: 27.8     avg: 56.4     median: 55.6 (10%)     max: 75.9 Watt
Power Consumption - Idle Power Consumption - external Monitor *
min: 3.04     avg: 6.1     median: 6.5 (5%)     max: 9.34 Watt
min: 4.09     avg: 6.5     median: 6.2 (4%)     max: 11.6 Watt
Power Consumption - Idle Power Consumption 150cd 1min *
min: 4.01     avg: 7.6     median: 7.2 (8%)     max: 21.7 Watt
min: 3.55     avg: 9.4     median: 6.4 (7%)     max: 30.7 Watt
Power Consumption - Cinebench R15 Multi Power Efficiency - external Monitor
min: 21.9     avg: 28.2     median: 28.7 (21%)     max: 33.8 Points per Watt
min: 18.7     avg: 25     median: 24.5 (18%)     max: 33.1 Points per Watt

Average Benchmarks Intel Core i7-1355U → 100% n=25

Average Benchmarks Intel Core i7-1255U → 98% n=25

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

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