Core i5-8400 vs Xeon E3-1280 v6

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 i5-8400 vs Xeon E3-1280 v6 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 i5-8400 vs Xeon E3-1280 v6: Pros, Cons & Final Verdict

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

Core i5-8400

2017

Why buy it

✅+1.5% higher PassMark.
✅Draws 65W instead of 72W, a 7W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with UHD Graphics 630, while Xeon E3-1280 v6 needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon E3-1280 v6 across 50 shared CPU benchmark tests.
❌Less compelling for workstation-style loads than Xeon E3-1280 v6, which brings 4 cores / 8 threads.
❌Launch MSRP is still $182 MSRP, while Xeon E3-1280 v6 mostly shows up through inconsistent older-market listings.

Xeon E3-1280 v6

2017

Why buy it

✅Better for gaming: +18.8% higher average FPS across 50 shared CPU benchmark tests.
✅Better for workstations and heavier parallel workloads: 4 cores / 8 threads.

Trade-offs

❌Lower PassMark (9,093 vs 9,229).
❌No integrated graphics, while Core i5-8400 can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i5-8400 better than Xeon E3-1280 v6?

Not really, because they are built for different jobs. Xeon E3-1280 v6 makes more sense for workstation-style multi-core throughput, while Core i5-8400 is the more practical desktop choice for gaming, platform cost, and everyday use.

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

For streaming, content creation, and heavier multitasking, Core i5-8400 is the stronger fit. You are getting 1.5% better PassMark, backed by 6 cores and 6 threads.

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

Core i5-8400 is the better buy right now. Core i5-8400 comes in at an unclear MSRP at $182 MSRP versus unclear MSRP, and it still gives you 1.5% better PassMark. The compromise is that Xeon E3-1280 v6 is still the better pure gaming CPU with a 18.8% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (50.7 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Xeon E3-1280 v6 is the safer long-term CPU choice because it gives you more room to grow and a better platform outlook.

Core i5-8400 vs Xeon E3-1280 v6 Technical Specifications

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

Core i5-8400

The Core i5-8400 is manufactured by Intel. It was released in 5 October 2017 (8 years ago). It is based on the Coffee Lake-S (2017−2018) architecture. It features 6 cores and 6 threads. Base frequency is 2.8 GHz, with boost up to 4 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: DDR3, DDR4. Passmark benchmark score: 9,229 points. Launch price was $182.

Xeon E3-1280 v6

The Xeon E3-1280 v6 is manufactured by Intel. It was released in 28 March 2017 (8 years ago). It is based on the Kaby Lake (2016−2019) architecture. It features 4 cores and 8 threads. Base frequency is 3.9 GHz, with boost up to 4.2 GHz. L3 cache: 8 MB. L2 cache: 1 MB. Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 72 Watt. Memory support: DDR4-2400, DDR3L-1866. Passmark benchmark score: 9,093 points. Launch price was $612.

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Processing Power

The Core i5-8400 packs 6 cores / 6 threads, while the Xeon E3-1280 v6 offers 4 cores / 8 threads — the Core i5-8400 has 2 more cores. Boost clocks reach 4 GHz on the Core i5-8400 versus 4.2 GHz on the Xeon E3-1280 v6 — a 4.9% clock advantage for the Xeon E3-1280 v6 (base: 2.8 GHz vs 3.9 GHz). The Core i5-8400 uses the Coffee Lake-S (2017−2018) architecture (14 nm), while the Xeon E3-1280 v6 uses Kaby Lake (2016−2019) (14 nm). In PassMark, the Core i5-8400 scores 9,229 against the Xeon E3-1280 v6's 9,093 — a 1.5% lead for the Core i5-8400. L3 cache: 9 MB (total) on the Core i5-8400 vs 8 MB on the Xeon E3-1280 v6.

Feature	Core i5-8400	Xeon E3-1280 v6
Cores / Threads	6 / 6+50%	4 / 8
Boost Clock	4 GHz	4.2 GHz+5%
Base Clock	2.8 GHz	3.9 GHz+39%
L3 Cache	9 MB (total)+13%	8 MB
L2 Cache	256K (per core)+25500%	1 MB
Process	14 nm	14 nm
Architecture	Coffee Lake-S (2017−2018)	Kaby Lake (2016−2019)
PassMark	9,229+1%	9,093

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Memory & Platform

Both processors use the LGA1151 socket with PCIe 3.0.

Feature	Core i5-8400	Xeon E3-1280 v6
Socket	LGA1151	LGA1151
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2666	—
Max RAM Capacity	128 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	16	—

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Advanced Features

Virtualization: VT-x, VT-d (Core i5-8400) / not specified (Xeon E3-1280 v6). The Core i5-8400 includes integrated graphics (UHD Graphics 630), while the Xeon E3-1280 v6 requires a dedicated GPU. Primary use case: Core i5-8400 targets Desktop.