Atom C3955 vs Core i5-8265U

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.

Atom C3955 vs Core i5-8265U 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.

Atom C3955 vs Core i5-8265U: Pros, Cons & Final Verdict

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

Atom C3955

2017

Why buy it

✅Better for gaming: +18.5% higher average FPS across 50 shared CPU benchmark tests.
✅+166.7% larger total L3 cache (16 MB vs 6 MB).

Trade-offs

❌Lower PassMark (5,803 vs 5,812).
❌113.3% higher power demand at 32W vs 15W.
❌No integrated graphics, while Core i5-8265U can still boot and troubleshoot without a discrete GPU.

Core i5-8265U

2018

Why buy it

✅+0.2% higher PassMark.
✅Draws 15W instead of 32W, a 17W reduction.
✅33.3% more PCIe lanes (16 vs 12) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel UHD Graphics 620, while Atom C3955 needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Atom C3955 across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (6 MB vs 16 MB).

Quick Answers

So, is Core i5-8265U better than Atom C3955?

It depends on what you want from the system. For gaming, Atom C3955 is ahead with a 18.5% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i5-8265U pulls ahead with 0.2% better PassMark. Atom C3955 also has the bigger cache pool with 166.7% larger total L3 cache (16 MB vs 6 MB).

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

For streaming, content creation, and heavier multitasking, Core i5-8265U is the stronger fit. You are getting 0.2% better PassMark, backed by 4 cores and 8 threads.

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

Core i5-8265U still makes the most sense overall. Core i5-8265U comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you 0.2% better PassMark.

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

Core i5-8265U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2018 vs 2017) and more multi-core headroom with 4 cores / 8 threads instead of 16/16. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Atom C3955 vs Core i5-8265U Technical Specifications

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

Atom C3955

The Atom C3955 is manufactured by Intel. It was released in 15 August 2017 (8 years ago). It is based on the Goldmont (2016−2017) architecture. It features 16 cores and 16 threads. Base frequency is 2.1 GHz, with boost up to 2.4 GHz. L3 cache: 16 MB. L2 cache: 16 MB. Built on 14 nm process technology. Socket: FCBGA1310. Thermal design power (TDP): 32 Watt. Memory support: DDR4: 2400. Passmark benchmark score: 5,803 points. Launch price was $434.

Core i5-8265U

The Core i5-8265U is manufactured by Intel. It was released in 1 October 2018 (7 years ago). It is based on the Whiskey Lake-U (2018−2019) architecture. It features 4 cores and 8 threads. Base frequency is 1.6 GHz, with boost up to 3.9 GHz. L3 cache: 6 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR4. Passmark benchmark score: 5,812 points. Launch price was $297.

⚡

Processing Power

The Atom C3955 packs 16 cores / 16 threads, while the Core i5-8265U offers 4 cores / 8 threads — the Atom C3955 has 12 more cores. Boost clocks reach 2.4 GHz on the Atom C3955 versus 3.9 GHz on the Core i5-8265U — a 47.6% clock advantage for the Core i5-8265U (base: 2.1 GHz vs 1.6 GHz). The Atom C3955 uses the Goldmont (2016−2017) architecture (14 nm), while the Core i5-8265U uses Whiskey Lake-U (2018−2019) (14 nm). In PassMark, the Atom C3955 scores 5,803 against the Core i5-8265U's 5,812 — a 0.2% lead for the Core i5-8265U. L3 cache: 16 MB on the Atom C3955 vs 6 MB (total) on the Core i5-8265U.

Feature	Atom C3955	Core i5-8265U
Cores / Threads	16 / 16+300%	4 / 8
Boost Clock	2.4 GHz	3.9 GHz+63%
Base Clock	2.1 GHz+31%	1.6 GHz
L3 Cache	16 MB+167%	6 MB (total)
L2 Cache	16 MB+6300%	256 kB (per core)
Process	14 nm	14 nm
Architecture	Goldmont (2016−2017)	Whiskey Lake-U (2018−2019)
PassMark	5,803	5,812
Cinebench R23 Multi	—	3,000
Geekbench 6 Single	—	1,200
Geekbench 6 Multi	—	3,500

🧠

Memory & Platform

The Atom C3955 uses the FCBGA1310 socket (PCIe 3.0), while the Core i5-8265U uses FCBGA1528 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-2400 memory speed. The Atom C3955 supports up to 256 GB of RAM compared to 64 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 12 (Atom C3955) vs 16 (Core i5-8265U) — the Core i5-8265U offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel FCBGA1310 (Atom C3955) and SoC (Core i5-8265U).

Feature	Atom C3955	Core i5-8265U
Socket	FCBGA1310	FCBGA1528
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2400	DDR4-2400
Max RAM Capacity	256 GB+300%	64 GB
RAM Channels	2	2
ECC Support	Yes	No
PCIe Lanes	12	16+33%

🔧

Advanced Features

Virtualization: not specified (Atom C3955) / VT-x, VT-d, EPT (Core i5-8265U). The Core i5-8265U includes integrated graphics (Intel UHD Graphics 620), while the Atom C3955 requires a dedicated GPU. Primary use case: Core i5-8265U targets Mainstream Laptop.