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.

Celeron 3865U vs Core i7-9700K 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.

Celeron 3865U vs Core i7-9700K: Pros, Cons & Final Verdict

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

Celeron 3865U

2017

Why buy it

✅Draws 15W instead of 95W, a 80W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core i7-9700K across 50 shared CPU benchmark tests.
❌Lower PassMark (1,343 vs 14,397).
❌Smaller total L3 cache (2 MB vs 12 MB).

Core i7-9700K

2018

Why buy it

✅Better for gaming: +589.0% higher average FPS across 50 shared CPU benchmark tests.
✅+500% larger total L3 cache (12 MB vs 2 MB).
✅60% more PCIe lanes (16 vs 10) for storage and expansion-heavy builds.

Trade-offs

❌Launch MSRP is still $385 MSRP, while Celeron 3865U mostly shows up through inconsistent older-market listings.
❌533.3% higher power demand at 95W vs 15W.

Quick Answers

So, is Core i7-9700K better than Celeron 3865U?

Yes. Core i7-9700K is the better all-around CPU here. It gives you a 589.0% average FPS lead across 50 shared CPU game tests in our data, 972% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Core i7-9700K is the better pick. According to our tests, it delivers 589.0% more average FPS across 50 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Core i7-9700K is the stronger fit. You are getting 972% better PassMark, backed by 8 cores and 8 threads. It also has the larger cache pool with 500% larger total L3 cache (12 MB vs 2 MB).

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

Core i7-9700K is the better buy right now. Core i7-9700K comes in at an unclear MSRP at $385 MSRP versus unclear MSRP, and it still gives you a 589.0% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (37.4 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Core i7-9700K makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2018 vs 2017), 500% larger total L3 cache (12 MB vs 2 MB), and more multi-core headroom with 8 cores / 8 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Celeron 3865U vs Core i7-9700K Technical Specifications

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

Celeron 3865U

The Celeron 3865U is manufactured by Intel. It was released in 3 January 2017 (8 years ago). It is based on the Kaby Lake-U (2017) architecture. It features 2 cores and 2 threads. Base frequency is 1.8 GHz, with boost up to 1.8 GHz. L3 cache: 2 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 1,343 points. Launch price was $107.

Core i7-9700K

The Core i7-9700K is manufactured by Intel. It was released in 19 October 2018 (7 years ago). It is based on the Coffee Lake-R (2018−2019) architecture. It features 8 cores and 8 threads. Base frequency is 3.6 GHz, with boost up to 4.9 GHz. L3 cache: 12 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 95 Watt. Memory support: DDR4. Passmark benchmark score: 14,397 points. Launch price was $374.

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Processing Power

The Celeron 3865U packs 2 cores / 2 threads, while the Core i7-9700K offers 8 cores / 8 threads — the Core i7-9700K has 6 more cores. Boost clocks reach 1.8 GHz on the Celeron 3865U versus 4.9 GHz on the Core i7-9700K — a 92.5% clock advantage for the Core i7-9700K (base: 1.8 GHz vs 3.6 GHz). The Celeron 3865U uses the Kaby Lake-U (2017) architecture (14 nm), while the Core i7-9700K uses Coffee Lake-R (2018−2019) (14 nm). In PassMark, the Celeron 3865U scores 1,343 against the Core i7-9700K's 14,397 — a 165.9% lead for the Core i7-9700K. L3 cache: 2 MB (total) on the Celeron 3865U vs 12 MB (total) on the Core i7-9700K.

Feature	Celeron 3865U	Core i7-9700K
Cores / Threads	2 / 2	8 / 8+300%
Boost Clock	1.8 GHz	4.9 GHz+172%
Base Clock	1.8 GHz	3.6 GHz+100%
L3 Cache	2 MB (total)	12 MB (total)+500%
L2 Cache	256K (per core)	256K (per core)
Process	14 nm	14 nm
Architecture	Kaby Lake-U (2017)	Coffee Lake-R (2018−2019)
PassMark	1,343	14,397+972%
Geekbench 6 Single	389	—
Geekbench 6 Multi	674	—

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Memory & Platform

The Celeron 3865U uses the BGA1356 socket (PCIe 3.0), while the Core i7-9700K uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 / LPDDR3-1866 on the Celeron 3865U versus DDR4-2666 on the Core i7-9700K — the Core i7-9700K supports 25% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i7-9700K supports up to 128 GB of RAM compared to 32 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 10 (Celeron 3865U) vs 16 (Core i7-9700K) — the Core i7-9700K offers 6 more lanes for additional GPUs or NVMe drives. Chipset compatibility: 100-series,200-series (Celeron 3865U) and Intel 300 series (Core i7-9700K).

Feature	Celeron 3865U	Core i7-9700K
Socket	BGA1356	LGA1151
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2133 / LPDDR3-1866	DDR4-2666+25%
Max RAM Capacity	32 GB	128 GB+300%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	10	16+60%

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Advanced Features

Only the Core i7-9700K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: VT-x / VT-d / EPT (Celeron 3865U) vs VT-x, VT-d (Core i7-9700K). Both include integrated graphics — Intel HD Graphics 610 (Celeron 3865U) and UHD Graphics 630 (Core i7-9700K) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Celeron 3865U targets Entry-level, Core i7-9700K targets Desktop. Direct competitor: Celeron 3865U rivals Pentium Gold 4415U.

Feature	Celeron 3865U	Core i7-9700K
Integrated GPU	Yes	Yes
IGPU Model	Intel HD Graphics 610	UHD Graphics 630
Unlocked	No	Yes
AVX-512	No	No
Virtualization	VT-x / VT-d / EPT	VT-x, VT-d
Target Use	Entry-level	Desktop