Core i3-8121U vs Core i3-8140U

PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

Core i3-8121U vs Core i3-8140U FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

Core i3-8121U vs Core i3-8140U: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

Core i3-8121U

2018

Why buy it

✅+1% higher PassMark.

Trade-offs

❌Lower Geekbench single-core performance for gaming (1,178 vs 1,225).
❌No integrated graphics, while Core i3-8140U can still boot and troubleshoot without a discrete GPU.

Core i3-8140U

2019

Why buy it

✅+4% higher Geekbench single-core performance for gaming and desktop responsiveness.
✅Integrated graphics onboard with UHD Graphics 620, while Core i3-8121U needs a discrete GPU.

Trade-offs

❌Lower PassMark (4,227 vs 4,271).

Quick Answers

So, is Core i3-8121U better than Core i3-8140U?

It depends on what you want from the system. For gaming, Core i3-8140U is ahead with a 1.6% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i3-8121U pulls ahead with 1% better PassMark.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, Core i3-8121U is the stronger fit. You are getting 1% better PassMark, backed by 2 cores and 4 threads.

Which one is the smarter buy today, not just the cheaper CPU?

Core i3-8121U still makes the most sense overall. Core i3-8121U comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you 1% better PassMark.

Which one is more future-proof for 2026 and beyond?

Core i3-8140U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2019 vs 2018). That makes it the safer long-term bet.

Core i3-8121U vs Core i3-8140U Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

Core i3-8121U

The Core i3-8121U is manufactured by Intel. It was released in 5 May 2018 (7 years ago). It is based on the Coffee Lake-U (2018−2019) architecture. It features 2 cores and 4 threads. Base frequency is 2.2 GHz, with boost up to 3.2 GHz. L3 cache: 4 MB (total). L2 cache: 256K (per core). Built on 10 nm process technology. Socket: BGA1440. Thermal design power (TDP): 15 Watt. Memory support: DDR4. Passmark benchmark score: 4,271 points. Launch price was $69.

Core i3-8140U

The Core i3-8140U is manufactured by Intel. It was released in 1 October 2019 (6 years ago). It features 2 cores and 4 threads. Base frequency is 2.1 GHz, with boost up to 3.9 GHz. L3 cache: 4 MB Intel® Smart Cache. Built on 14 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR4-2400, LPDDR3-2133. Passmark benchmark score: 4,227 points. Launch price was $69.

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Processing Power

Both the Core i3-8121U and Core i3-8140U share an identical 2-core/4-thread configuration. Boost clocks reach 3.2 GHz on the Core i3-8121U versus 3.9 GHz on the Core i3-8140U — a 19.7% clock advantage for the Core i3-8140U (base: 2.2 GHz vs 2.1 GHz). The Core i3-8121U is built on the Coffee Lake-U (2018−2019) architecture. In PassMark, the Core i3-8121U scores 4,271 against the Core i3-8140U's 4,227 — a 1% lead for the Core i3-8121U. Geekbench 6 single-core — the metric most relevant to gaming — records 1,178 vs 1,225, a 3.9% lead for the Core i3-8140U that directly translates to higher frame rates. L3 cache: 4 MB (total) on the Core i3-8121U vs 4 MB Intel® Smart Cache on the Core i3-8140U.

Feature	Core i3-8121U	Core i3-8140U
Cores / Threads	2 / 4	2 / 4
Boost Clock	3.2 GHz	3.9 GHz+22%
Base Clock	2.2 GHz+5%	2.1 GHz
L3 Cache	4 MB (total)	4 MB Intel® Smart Cache
L2 Cache	256K (per core)	—
Process	10 nm-29%	14 nm
Architecture	Coffee Lake-U (2018−2019)	—
PassMark	4,271+1%	4,227
Geekbench 6 Single	1,178	1,225+4%
Geekbench 6 Multi	2,250	—

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Memory & Platform

The Core i3-8121U uses the BGA1440 socket (PCIe 3.0), while the Core i3-8140U uses FCBGA1528 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-2400 memory speed. The Core i3-8140U supports up to 64 GB of RAM compared to 32 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes.

Feature	Core i3-8121U	Core i3-8140U
Socket	BGA1440	FCBGA1528
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2400	DDR4-2400
Max RAM Capacity	32 GB	64 GB+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	16

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Advanced Features

Neither processor supports overclocking. Only the Core i3-8121U supports AVX-512 instructions — important for machine learning and scientific applications. Both support VT-x, VT-d, EPT virtualization. The Core i3-8140U includes integrated graphics (UHD Graphics 620), while the Core i3-8121U requires a dedicated GPU. Primary use case: Core i3-8121U targets Productivity, Core i3-8140U targets Mainstream Laptop. Direct competitor: Core i3-8121U rivals Core i3-8130U; Core i3-8140U rivals Ryzen 3 3300U.

Feature	Core i3-8121U	Core i3-8140U
Integrated GPU	No	Yes
IGPU Model	—	UHD Graphics 620
Unlocked	No	No
AVX-512	Yes	No
Virtualization	VT-x, VT-d, EPT	VT-x, VT-d, EPT
Target Use	Productivity	Mainstream Laptop