Core i5-9400T vs Xeon E3-1285L v4

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 i5-9400T vs Xeon E3-1285L v4 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 i5-9400T vs Xeon E3-1285L v4: Pros, Cons & Final Verdict

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

Core i5-9400T

2019

Why buy it

✅+1.1% higher PassMark.
✅+50% larger total L3 cache (9 MB vs 6 MB).
✅Draws 35W instead of 65W, a 30W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with UHD Graphics 630, while Xeon E3-1285L v4 needs a discrete GPU.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon E3-1285L v4 across 50 shared CPU benchmark tests.
❌Less compelling for workstation-style loads than Xeon E3-1285L v4, which brings 4 cores / 8 threads.
❌Launch MSRP is still $182 MSRP, while Xeon E3-1285L v4 mostly shows up through inconsistent older-market listings.

Xeon E3-1285L v4

2015

Why buy it

✅Better for gaming: +18.5% higher average FPS across 50 shared CPU benchmark tests.
✅Better for workstations and heavier parallel workloads: 4 cores / 8 threads.

Trade-offs

❌Lower PassMark (8,092 vs 8,180).
❌Smaller total L3 cache (6 MB vs 9 MB).
❌85.7% higher power demand at 65W vs 35W.
❌No integrated graphics, while Core i5-9400T can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i5-9400T better than Xeon E3-1285L v4?

Not really, because they are built for different jobs. Xeon E3-1285L v4 makes more sense for workstation-style multi-core throughput, while Core i5-9400T 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 i5-9400T is the stronger fit. You are getting 1.1% better PassMark, backed by 6 cores and 6 threads. It also has the larger cache pool with 50% larger total L3 cache (9 MB vs 6 MB).

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

Core i5-9400T is the better buy right now. Core i5-9400T comes in at an unclear MSRP at $182 MSRP versus unclear MSRP, and it still gives you 1.1% better PassMark. The compromise is that Xeon E3-1285L v4 is still the better pure gaming CPU with a 18.5% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (44.9 vs 0.0 PassMark/$), 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 i5-9400T makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2019 vs 2015), 50% larger total L3 cache (9 MB vs 6 MB), 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 i5-9400T vs Xeon E3-1285L v4 Technical Specifications

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

Core i5-9400T

The Core i5-9400T is manufactured by Intel. It was released in 1 September 2018 (7 years ago). It is based on the Coffee Lake (2017−2019) architecture. It features 6 cores and 6 threads. Base frequency is 1.8 GHz, with boost up to 3.4 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: 8,180 points. Launch price was $182.

Xeon E3-1285L v4

The Xeon E3-1285L v4 is manufactured by Intel. It was released in 2015-01-01. It is based on the Broadwell-DT (2015) architecture. It features 4 cores and 8 threads. Base frequency is 3.4 GHz, with boost up to 3.8 GHz. L3 cache: 6 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1150. Thermal design power (TDP): 65 Watt. Memory support: DDR3L-1333, DDR3L-1600, DDR3L-1866. Passmark benchmark score: 8,092 points. Launch price was $800.

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Processing Power

The Core i5-9400T packs 6 cores / 6 threads, while the Xeon E3-1285L v4 offers 4 cores / 8 threads — the Core i5-9400T has 2 more cores. Boost clocks reach 3.4 GHz on the Core i5-9400T versus 3.8 GHz on the Xeon E3-1285L v4 — a 11.1% clock advantage for the Xeon E3-1285L v4 (base: 1.8 GHz vs 3.4 GHz). The Core i5-9400T uses the Coffee Lake (2017−2019) architecture (14 nm), while the Xeon E3-1285L v4 uses Broadwell-DT (2015) (14 nm). In PassMark, the Core i5-9400T scores 8,180 against the Xeon E3-1285L v4's 8,092 — a 1.1% lead for the Core i5-9400T. L3 cache: 9 MB (total) on the Core i5-9400T vs 6 MB (total) on the Xeon E3-1285L v4.

Feature	Core i5-9400T	Xeon E3-1285L v4
Cores / Threads	6 / 6+50%	4 / 8
Boost Clock	3.4 GHz	3.8 GHz+12%
Base Clock	1.8 GHz	3.4 GHz+89%
L3 Cache	9 MB (total)+50%	6 MB (total)
L2 Cache	256K (per core)	256K (per core)
Process	14 nm	14 nm
Architecture	Coffee Lake (2017−2019)	Broadwell-DT (2015)
PassMark	8,180+1%	8,092

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Memory & Platform

The Core i5-9400T uses the LGA1151 socket (PCIe 3.0), while the Xeon E3-1285L v4 uses LGA1150 (PCIe 5.0) — making them incompatible on the same motherboard.

Feature	Core i5-9400T	Xeon E3-1285L v4
Socket	LGA1151	LGA1150
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: VT-x, VT-d (Core i5-9400T) / not specified (Xeon E3-1285L v4). The Core i5-9400T includes integrated graphics (UHD Graphics 630), while the Xeon E3-1285L v4 requires a dedicated GPU. Primary use case: Core i5-9400T targets Desktop.