Atom x7809C vs Core i5-9400

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 x7809C vs Core i5-9400 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 x7809C vs Core i5-9400: Pros, Cons & Final Verdict

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

Atom x7809C

2024

Why buy it

✅Better for gaming: +4.1% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 25W instead of 65W, a 40W reduction.
✅Newer platform on FCBGA1264 with DDR5 support instead of LGA1151 and DDR4.

Trade-offs

❌Smaller total L3 cache (6 MB vs 9 MB).
❌No integrated graphics, while Core i5-9400 can still boot and troubleshoot without a discrete GPU.

Core i5-9400

2019

Why buy it

✅+50% larger total L3 cache (9 MB vs 6 MB).
✅77.8% more PCIe lanes (16 vs 9) for storage and expansion-heavy builds.
✅Integrated graphics onboard with UHD Graphics 630, while Atom x7809C needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Atom x7809C across 50 shared CPU benchmark tests.
❌Lower PassMark (9,372 vs 9,409).
❌Launch MSRP is still $192 MSRP, while Atom x7809C mostly shows up through inconsistent older-market listings.
❌160% higher power demand at 65W vs 25W.
❌Older platform position on LGA1151 with DDR4, while Atom x7809C moves to FCBGA1264 and DDR5.

Quick Answers

So, is Atom x7809C better than Core i5-9400?

Yes. Atom x7809C is the better all-around CPU here. It gives you a 4.1% average FPS lead across 50 shared CPU game tests in our data, 0.4% 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, Atom x7809C is the better pick. According to our tests, it delivers 4.1% 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, Atom x7809C is the stronger fit. You are getting 0.4% better PassMark, backed by 8 cores and 8 threads.

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

Atom x7809C is still the faster CPU overall, but Core i5-9400 is easier to justify if budget matters more than peak performance. Atom x7809C comes in at an unclear MSRP at unclear MSRP versus $192 MSRP, and it still gives you a 4.1% average FPS lead across 50 shared CPU game tests in our data. Core i5-9400 is also 100.0% better value on MSRP (48.8 vs 0.0 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Atom x7809C makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2024 vs 2019), a healthier platform with FCBGA1264 and DDR5 instead of LGA1151, and more multi-core headroom with 8 cores / 8 threads instead of 6/6. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Atom x7809C vs Core i5-9400 Technical Specifications

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

Atom x7809C

The Atom x7809C is manufactured by Intel. It was released in 8 April 2024 (1 year ago). It is based on the Amston Lake (2024−2025) architecture. It features 8 cores and 8 threads. Base frequency is 2 GHz, with boost up to 3.6 GHz. L3 cache: 6 MB (total). L2 cache: 2 MB (per module). Built on 10 nm process technology. Socket: FCBGA1264. Thermal design power (TDP): 25 Watt. Memory support: DDR4, DDR5. Passmark benchmark score: 9,409 points. Launch price was $117.

Core i5-9400

The Core i5-9400 is manufactured by Intel. It was released in 19 October 2018 (7 years ago). It is based on the Coffee Lake (2017−2019) architecture. It features 6 cores and 6 threads. Base frequency is 2.9 GHz, with boost up to 4.1 GHz. L3 cache: 9 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 65 Watt. Memory support: DDR4-2666. Passmark benchmark score: 9,372 points. Launch price was $182.

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Processing Power

The Atom x7809C packs 8 cores / 8 threads, while the Core i5-9400 offers 6 cores / 6 threads — the Atom x7809C has 2 more cores. Boost clocks reach 3.6 GHz on the Atom x7809C versus 4.1 GHz on the Core i5-9400 — a 13% clock advantage for the Core i5-9400 (base: 2 GHz vs 2.9 GHz). The Atom x7809C uses the Amston Lake (2024−2025) architecture (10 nm), while the Core i5-9400 uses Coffee Lake (2017−2019) (14 nm). In PassMark, the Atom x7809C scores 9,409 against the Core i5-9400's 9,372 — a 0.4% lead for the Atom x7809C. L3 cache: 6 MB (total) on the Atom x7809C vs 9 MB (total) on the Core i5-9400.

Feature	Atom x7809C	Core i5-9400
Cores / Threads	8 / 8+33%	6 / 6
Boost Clock	3.6 GHz	4.1 GHz+14%
Base Clock	2 GHz	2.9 GHz+45%
L3 Cache	6 MB (total)	9 MB (total)+50%
L2 Cache	2 MB (per module)	256K (per core)+12700%
Process	10 nm-29%	14 nm
Architecture	Amston Lake (2024−2025)	Coffee Lake (2017−2019)
PassMark	9,409	9,372
Geekbench 6 Single	1,102	—
Geekbench 6 Multi	4,657	—

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Memory & Platform

The Atom x7809C uses the FCBGA1264 socket (PCIe 4.0), while the Core i5-9400 uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-4800 on the Atom x7809C versus DDR4-2666 on the Core i5-9400 — the Atom x7809C supports 80% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-9400 supports up to 128 GB of RAM compared to 32 GB — 300% more capacity for professional workloads. Memory channels: 1 (Atom x7809C) vs 2 (Core i5-9400). PCIe lanes: 9 (Atom x7809C) vs 16 (Core i5-9400) — the Core i5-9400 offers 7 more lanes for additional GPUs or NVMe drives.

Feature	Atom x7809C	Core i5-9400
Socket	FCBGA1264	LGA1151
PCIe Generation	PCIe 4.0+33%	PCIe 3.0
Max RAM Speed	DDR5-4800+80%	DDR4-2666
Max RAM Capacity	32 GB	128 GB+300%
RAM Channels	1	2+100%
ECC Support	Yes	No
PCIe Lanes	9	16+78%

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Advanced Features

Neither processor supports overclocking. Both support VT-x, VT-d virtualization. The Core i5-9400 includes integrated graphics (UHD Graphics 630), while the Atom x7809C requires a dedicated GPU. Primary use case: Core i5-9400 targets Desktop.