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Intel’s Core i3-8121U was an unusual 10 nm mobile processor whose review found a more complicated story than “new process, faster chip.” At the same 2.2 GHz clock as the 14 nm Core i3-8130U, AnandTech reported broad parity across most of its estimated SPEC2006 results, with exceptions. At stock settings, outcomes depended on the workload: some tests were close, while code using AVX2 or AVX-512 produced striking results in particular tests. The i3-8121U also lacked usable integrated graphics in the systems covered, which paired it with a discrete Radeon GPU.
Why the Core i3-8121U was notable
The i3-8121U was an 8th-generation mobile Core i3 based on Intel’s formerly named Cannon Lake design. Its significance came from being identified as a 10 nm processor at a time when most directly comparable Intel mobile chips, including the Core i3-8130U, used 14 nm. That manufacturing label alone does not establish that it was faster or more efficient in real use; the review’s results varied by workload and test conditions.
Intel’s product record lists the i3-8121U as discontinued. The AnandTech deep dive by Ian Cutress, published January 25, 2019, examined its architecture, power behavior and performance, chiefly against the 14 nm i3-8130U. The review’s findings are best read as a historical comparison, not as a current laptop recommendation.
What Intel’s specifications say
Intel lists these specifications for the mobile Core i3-8121U:
#1 Best Overall
- 4 cores (4 P-cores + 0 E-cores) and 8 threads. Integrated Intel UHD Graphics 730 included.
- Performance two core microarchitecture, prioritizing and distributing workloads to optimize performance
- Up to 4.7 GHz unlocked. 12MB Cache
- Compatible with Intel 600-series (with potential BIOS update) and 700-series chipset-based motherboards
- PCIe 5.0 & 4.0 support. DDR4 and DDR5 Memory support. RM1 thermal solution included.
- 10 nm process; two cores and four threads.
- 2.20 GHz base frequency and maximum turbo frequency of 3.20 GHz.
- 4 MB Intel Smart Cache and 15 W TDP.
- Q2 2018 launch; current product status: discontinued.
- Memory support for DDR4-2400 or LPDDR4/x-2400, up to 32 GB across two channels.
These are Intel’s published processor specifications, not measurements of a particular laptop or mini PC. Intel’s Core i3-8121U specification page identifies the product collection as 8th Generation Intel Core i3 Processors and the processor’s former codename as Cannon Lake.
At a fixed 2.2 GHz, results were mostly close—with exceptions
To examine performance per clock, AnandTech compared the i3-8121U and i3-8130U at a fixed 2.2 GHz with turbo disabled. The publisher characterized most listed SPEC2006 Speed workloads as broadly at parity, while noting exceptions such as the i3-8130U’s advantages in libquantum and lbm. Cutress summarized the overall pattern in that fixed-clock test: “By and large, we actually get parity between both processors on almost all the tests.”
Rank #2
- Intel® Core® i3 3.30 GHz processor uses less power and the hyper-threading architecture delivers high performance for demanding applications at an affordable price
- 12 MB of L3 cache rapidly retrieves the most used data available to improve system performance
- Built-in Intel UHD Graphics 730 controller for improved graphics and visual quality. Supports up to 4 monitors.
The figures below are AnandTech’s 2019 estimated results, not official SPEC submissions: the review said they had not been verified on the SPEC website. The table reports the benchmark scores as published; the chips were tested at the same fixed clock, not at their normal stock settings.
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| SPEC2006 Speed workload | Core i3-8121U | Core i3-8130U | Context |
|---|---|---|---|
| 400.perlbench | 24.8 | 26.1 | AnandTech estimated result; fixed at 2.2 GHz, turbo disabled |
| 403.gcc | 27.6 | 27.3 | AnandTech estimated result; fixed at 2.2 GHz, turbo disabled |
| 462.libquantum | 70.5 | 75.4 | AnandTech estimated result; fixed at 2.2 GHz, turbo disabled |
| 470.lbm | 59.9 | 68.4 | AnandTech estimated result; fixed at 2.2 GHz, turbo disabled |
The results illustrate why “mostly parity” is more useful than calling either chip a universal winner: even at a controlled clock, relative performance shifted between workloads. AnandTech’s fixed-clock SPEC2006 results include the full set and the estimated-results qualification.
Rank #3
- 4 cores (4 P-cores + 0 E-cores) and 8 threads
- Performance two core microarchitecture, prioritizing and distributing workloads to optimize performance
- Up to 4.7 GHz unlocked. 12MB Cache
- Compatible with Intel 600-series (with potential BIOS update) and 700-series chipset-based motherboards
- PCIe 5.0 & 4.0 support. DDR4 and DDR5 Memory support. RM1 thermal solution included. Discrete graphics required.
Stock results depended on the workload and instruction set
At stock settings, clock behavior and the test platform become part of the comparison, so those results should not be blended with the fixed-frequency SPEC2006 figures. AnandTech’s system tests covered tasks including GIMP loading, image processing, scientific and particle workloads, emulation, neural simulation, optimized compute and 3D model development. Some outcomes were close; others diverged. In several non-AVX tests, the Kaby Lake-based comparison chip did better.
AVX results were a specific strength, not an overall ranking
In a 3D particle test using AVX2 and AVX-512, AnandTech reported a score of 4519 for Cannon Lake. It compared that with 4185 for a Core i9-7980XE run in non-AVX mode. Because those runs used different instruction modes, the comparison is specific to that test and does not establish that the i3-8121U outperforms the i9-7980XE generally. Cutress’s comment that “When we crank on the AVX2 and AVX512, there is no stopping the Cannon Lake chip here” referred to this specialized benchmark, not all applications.
Rank #4
- Intel Core i3-12100F Desktop Processor 4 (4P-0E) Cores Up to 4.3 GHz Turbo Frequency LGA1700 600 Series Chipset 58W Processor Base Power
Vector instructions can accelerate suitable code substantially, but most software does not use every supported instruction path in the same way. A strong result on an AVX-optimized workload therefore cannot predict performance in everyday tasks. AnandTech’s stock system tests show why results need to be considered workload by workload.
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The graphics limitation shaped the systems that used it
Notebookcheck describes the i3-8121U as lacking an integrated graphics card, calling the configuration “2+0.” The identified systems therefore used discrete graphics rather than relying on integrated graphics: Notebookcheck names the Intel NUC8i3CYSM and Lenovo IdeaPad 330-15ICN with an AMD Radeon RX 540. AnandTech’s later NUC report refers to Radeon 540 graphics in the NUC.
Best Value
- Featuring Intel 8th Generation Intel Core i3-8121u, you can easily tuck this 4 x 4 inch mini PC out of sight in your living or family room
- Radeon 540 discrete graphics with 2GB GDDR5 Graphics memory gives you picture perfect performance for playing your favorite eSports games, streaming movies, or viewing photos
- 4 GB of LPDDR4 Memory and a 1 TB SATA HDD installed along with an empty M.2 2280 slot where you can add an SSD, or an Intel Optane Memory Module for even more performance!
- Windows 10 Home pre-installed
- 2 - HDMI 2.0B Display Ports, 4 - USB 3.1 Ports, Intel Wireless-AC 2x2 802.11AC + Bluetooth V5, Intel Gigabit LAN, SD card slot, 3.5mm headphone/Microphone jack, Kensington lock support
This matters when interpreting system benchmarks: a score recorded from a complete mini PC or laptop is not automatically a pure measurement of the processor. Platform design, memory, cooling and graphics configuration can affect results. For example, Notebookcheck lists 317.6 points in Cinebench R15 CPU Multi 64-bit for the NUC8i3CYSM configuration. That is one recorded system result, not a controlled cross-system comparison or a universal score for every i3-8121U device. See Notebookcheck’s i3-8121U benchmark and specification page for its system and benchmark context.
What happened to the Cannon Lake NUCs
The NUC8i3CYSM mini PC is a clear historical example of the chip in a real system; the IdeaPad 330-15ICN is a laptop example. AnandTech reported on November 6, 2019, that Intel had notified partners of plans to discontinue its Crimson Canyon NUC line, which paired Cannon Lake processors with AMD Radeon 540 graphics. The report described the processor as appearing in a small number of NUC systems and a few China-market laptops; it did not provide a market-wide sales or adoption count.
Both Intel’s processor record and AnandTech’s NUC report place these products in the past rather than establishing present availability. They are legacy hardware examples, not straightforward current recommendations. AnandTech’s account of the NUC line is available in Intel Axes 10nm CPU Based NUC.
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