Celeron 3865U vs Ryzen 7 7800X3D

CPU

GPU

Celeron 3865U

2 Cores2 Thrd15 WWMax: 1.8 GHz2017

Buy on Amazon

Ryzen 7 7800X3D

8 Cores16 Thrd120 WWMax: 5 GHz2023

Buy on Amazon

Celeron 3865U vs Ryzen 7 7800X3D Performance Spectrum

Celeron 3865U

2 / 2

1,343

0.0%

34,293

+2453.5%

Ryzen Threadripper PRO 7965WX

Ryzen Threadripper 7970X

About PassMark

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 Ryzen 7 7800X3D 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 Ryzen 7 7800X3D: 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 120W, a 105W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 7 7800X3D across 37 shared CPU benchmark tests.
❌Lower Geekbench multi-core (674 vs 15,000).
❌Older platform position on BGA1356 with DDR4, while Ryzen 7 7800X3D moves to AM5 and DDR5.

Ryzen 7 7800X3D

2023

Why buy it

✅Better for gaming: +736.1% higher average FPS across 37 shared CPU benchmark tests.
✅Newer platform on AM5 with DDR5 support instead of BGA1356 and DDR4.
✅180% more PCIe lanes (28 vs 10) for storage and expansion-heavy builds.

Trade-offs

❌Launch MSRP is still $449 MSRP, while Celeron 3865U mostly shows up through inconsistent older-market listings.
❌700% higher power demand at 120W vs 15W.

Quick Answers

So, is Ryzen 7 7800X3D better than Celeron 3865U?

Yes. Ryzen 7 7800X3D is the better all-around CPU here. It gives you a 736.1% average FPS lead across 37 shared CPU game tests in our data, 2125.5% better Geekbench multi-core, 2453.5% higher 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, Ryzen 7 7800X3D is the better pick. According to our tests, it delivers 736.1% more average FPS across 37 shared CPU game tests. It also has a clear cache advantage at 96 MB versus 2 MB.

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

For streaming, content creation, and heavier multitasking, Ryzen 7 7800X3D is the stronger fit. You are getting 2125.5% better Geekbench multi-core, backed by 8 cores and 16 threads. It also has the larger cache pool with 4700% larger total L3 cache (96 MB vs 2 MB).

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

Ryzen 7 7800X3D is the better buy right now. Ryzen 7 7800X3D comes in at an unclear MSRP at $449 MSRP versus unclear MSRP, and it still gives you a 736.1% average FPS lead across 37 shared CPU game tests in our data. It is also 100.0% better value on MSRP (76.4 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Ryzen 7 7800X3D makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2023 vs 2017), a healthier platform with AM5 and DDR5 instead of BGA1356, 3D V-Cache and a much larger 96 MB L3 cache instead of 2 MB, and more multi-core headroom with 8 cores / 16 threads instead of 2/2. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Celeron 3865U vs Ryzen 7 7800X3D 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.

Ryzen 7 7800X3D

The Ryzen 7 7800X3D is manufactured by AMD. It was released in 4 January 2023 (2 years ago). It is based on the Raphael (Zen4) (2022−2023) architecture. It features 8 cores and 16 threads. Base frequency is 4.4 GHz, with boost up to 5 GHz. L3 cache: 96 MB (total). L2 cache: 1 MB (per core). Built on 5 nm process technology. Socket: AM5. Thermal design power (TDP): 120 Watt. Memory support: DDR5-5200. Passmark benchmark score: 34,293 points. Launch price was $449.

⚡

Processing Power

The Celeron 3865U packs 2 cores / 2 threads, while the Ryzen 7 7800X3D offers 8 cores / 16 threads — the Ryzen 7 7800X3D has 6 more cores. Boost clocks reach 1.8 GHz on the Celeron 3865U versus 5 GHz on the Ryzen 7 7800X3D — a 94.1% clock advantage for the Ryzen 7 7800X3D (base: 1.8 GHz vs 4.4 GHz). The Celeron 3865U uses the Kaby Lake-U (2017) architecture (14 nm), while the Ryzen 7 7800X3D uses Raphael (Zen4) (2022−2023) (5 nm). In PassMark, the Celeron 3865U scores 1,343 against the Ryzen 7 7800X3D's 34,293 — a 184.9% lead for the Ryzen 7 7800X3D. Geekbench 6 single-core — the metric most relevant to gaming — records 389 vs 2,700, a 149.6% lead for the Ryzen 7 7800X3D that directly translates to higher frame rates. Multi-core Geekbench: 674 vs 15,000 (182.8% advantage for the Ryzen 7 7800X3D). L3 cache: 2 MB (total) on the Celeron 3865U vs 96 MB (total) on the Ryzen 7 7800X3D.

Feature	Celeron 3865U	Ryzen 7 7800X3D
Cores / Threads	2 / 2	8 / 16+300%
Boost Clock	1.8 GHz	5 GHz+178%
Base Clock	1.8 GHz	4.4 GHz+144%
L3 Cache	2 MB (total)	96 MB (total)+4700%
L2 Cache	256K (per core)+25500%	1 MB (per core)
Process	14 nm	5 nm-64%
Architecture	Kaby Lake-U (2017)	Raphael (Zen4) (2022−2023)
PassMark	1,343	34,293+2453%
Cinebench R23 Multi	—	18,500
Geekbench 6 Single	389	2,700+594%
Geekbench 6 Multi	674	15,000+2126%

🧠

Memory & Platform

The Celeron 3865U uses the BGA1356 socket (PCIe 3.0), while the Ryzen 7 7800X3D uses AM5 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 / LPDDR3-1866 on the Celeron 3865U versus DDR5-5200 on the Ryzen 7 7800X3D — the Ryzen 7 7800X3D supports 143.8% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 7 7800X3D 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 28 (Ryzen 7 7800X3D) — the Ryzen 7 7800X3D offers 18 more lanes for additional GPUs or NVMe drives. Chipset compatibility: 100-series,200-series (Celeron 3865U) and X670E,X670,B650E,B650,A620 (Ryzen 7 7800X3D).

Feature	Celeron 3865U	Ryzen 7 7800X3D
Socket	BGA1356	AM5
PCIe Generation	PCIe 3.0	PCIe 5.0+67%
Max RAM Speed	DDR4-2133 / LPDDR3-1866	DDR5-5200+144%
Max RAM Capacity	32 GB	128 GB+300%
RAM Channels	2	2
ECC Support	No	Yes
PCIe Lanes	10	28+180%

🔧

Advanced Features

Only the Ryzen 7 7800X3D has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Ryzen 7 7800X3D supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x / VT-d / EPT (Celeron 3865U) vs AMD-V (Ryzen 7 7800X3D). Both include integrated graphics — Intel HD Graphics 610 (Celeron 3865U) and AMD Radeon Graphics (2-core) (Ryzen 7 7800X3D) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Celeron 3865U targets Entry-level, Ryzen 7 7800X3D targets Gaming. Direct competitor: Celeron 3865U rivals Pentium Gold 4415U; Ryzen 7 7800X3D rivals Intel Core i7-14700K.

Feature	Celeron 3865U	Ryzen 7 7800X3D
Integrated GPU	Yes	Yes
IGPU Model	Intel HD Graphics 610	AMD Radeon Graphics (2-core)
Unlocked	No	Yes
AVX-512	No	Yes
Virtualization	VT-x / VT-d / EPT	AMD-V
Target Use	Entry-level	Gaming