Core i5-8400T vs Xeon E3-1565L v5

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 i5-8400T vs Xeon E3-1565L v5 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 i5-8400T vs Xeon E3-1565L v5: Pros, Cons & Final Verdict

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

Core i5-8400T

2018

Why buy it

✅+1.4% higher PassMark.
✅Costs $1,370 less on MSRP ($182 MSRP vs $1,552 MSRP).
✅Delivers 764.5% more PassMark for each dollar spent, at 40.8 vs 4.7 PassMark/$ ($182 MSRP vs $1,552 MSRP).
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with UHD Graphics 630, while Xeon E3-1565L v5 needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon E3-1565L v5 across 50 shared CPU benchmark tests.
❌Less compelling for workstation-style loads than Xeon E3-1565L v5, which brings 4 cores / 8 threads.

Xeon E3-1565L v5

2016

Why buy it

✅Better for gaming: +9.1% higher average FPS across 50 shared CPU benchmark tests.
✅Better for workstations and heavier parallel workloads: 4 cores / 8 threads.

Trade-offs

❌Lower PassMark (7,325 vs 7,426).
❌Lower PassMark per dollar, at 4.7 vs 40.8 PassMark/$ ($1,552 MSRP vs $182 MSRP).
❌No integrated graphics, while Core i5-8400T can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Core i5-8400T.

Quick Answers

So, is Core i5-8400T better than Xeon E3-1565L v5?

Not really, because they are built for different jobs. Xeon E3-1565L v5 makes more sense for workstation-style multi-core throughput, while Core i5-8400T 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 i5-8400T is the stronger fit. You are getting 1.4% better PassMark, backed by 6 cores and 6 threads.

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

Core i5-8400T is the better buy right now. Core i5-8400T comes in $1,370 cheaper on MSRP at $182 MSRP versus $1,552 MSRP, and it still gives you 1.4% better PassMark. The compromise is that Xeon E3-1565L v5 is still the better pure gaming CPU with a 9.1% average FPS lead across 50 shared CPU game tests in our data. It is also 764.5% better value on MSRP (40.8 vs 4.7 PassMark/$), 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 i5-8400T makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2018 vs 2016) and more multi-core headroom with 6 cores / 6 threads instead of 4/8. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i5-8400T vs Xeon E3-1565L v5 Technical Specifications

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

Core i5-8400T

The Core i5-8400T is manufactured by Intel. It was released in 2 April 2018 (7 years ago). It is based on the Coffee Lake (2017−2019) architecture. It features 6 cores and 6 threads. Base frequency is 1.7 GHz, with boost up to 3.3 GHz. L3 cache: 9 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 35 Watt. Memory support: DDR4-2666. Passmark benchmark score: 7,426 points. Launch price was $182.

Xeon E3-1565L v5

The Xeon E3-1565L v5 is manufactured by Intel. It was released in 31 May 2016 (9 years ago). It is based on the Skylake-H (2015−2016) architecture. It features 4 cores and 8 threads. Base frequency is 2.5 GHz, with boost up to 3.5 GHz. L3 cache: 8 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: BGA1440. Thermal design power (TDP): 35 Watt. Memory support: DDR3L,LPDDR3 1600 MHz, DDR4 2133 MHz at 1.2V. Passmark benchmark score: 7,325 points. Launch price was $417.

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Processing Power

The Core i5-8400T packs 6 cores / 6 threads, while the Xeon E3-1565L v5 offers 4 cores / 8 threads — the Core i5-8400T has 2 more cores. Boost clocks reach 3.3 GHz on the Core i5-8400T versus 3.5 GHz on the Xeon E3-1565L v5 — a 5.9% clock advantage for the Xeon E3-1565L v5 (base: 1.7 GHz vs 2.5 GHz). The Core i5-8400T uses the Coffee Lake (2017−2019) architecture (14 nm), while the Xeon E3-1565L v5 uses Skylake-H (2015−2016) (14 nm). In PassMark, the Core i5-8400T scores 7,426 against the Xeon E3-1565L v5's 7,325 — a 1.4% lead for the Core i5-8400T. L3 cache: 9 MB (total) on the Core i5-8400T vs 8 MB (total) on the Xeon E3-1565L v5.

Feature	Core i5-8400T	Xeon E3-1565L v5
Cores / Threads	6 / 6+50%	4 / 8
Boost Clock	3.3 GHz	3.5 GHz+6%
Base Clock	1.7 GHz	2.5 GHz+47%
L3 Cache	9 MB (total)+13%	8 MB (total)
L2 Cache	256K (per core)	256 kB (per core)
Process	14 nm	14 nm
Architecture	Coffee Lake (2017−2019)	Skylake-H (2015−2016)
PassMark	7,426+1%	7,325
Cinebench R23 Multi	3,737	—
Geekbench 6 Single	1,092	—
Geekbench 6 Multi	3,816	—

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Memory & Platform

The Core i5-8400T uses the LGA1151 socket (PCIe 3.0), while the Xeon E3-1565L v5 uses BGA1440 (PCIe 5.0) — making them incompatible on the same motherboard.

Feature	Core i5-8400T	Xeon E3-1565L v5
Socket	LGA1151	BGA1440
PCIe Generation	PCIe 3.0	PCIe 5.0+67%
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: Yes (Core i5-8400T) / not specified (Xeon E3-1565L v5). The Core i5-8400T includes integrated graphics (UHD Graphics 630), while the Xeon E3-1565L v5 requires a dedicated GPU.

Feature	Core i5-8400T	Xeon E3-1565L v5
Integrated GPU	Yes	—
IGPU Model	UHD Graphics 630	—
AVX-512	No	—
Virtualization	Yes	—

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Value Analysis

At launch, the Core i5-8400T was priced at $182, while the Xeon E3-1565L v5 came in at $1552. On launch pricing ($182 vs $1552), Core i5-8400T was $1370 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i5-8400T delivers 40.8 pts/$ vs 4.7 pts/$ for the Xeon E3-1565L v5 — making the Core i5-8400T the 158.5% better value option.

Feature	Core i5-8400T	Xeon E3-1565L v5
MSRP	$182-88%	$1552
Performance per Dollar	40.8+768%	4.7
Release Date	2018	2016

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