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.

Head-to-Head Verdict, Benchmarks, Value & Long-Term Outlook

This comparison brings together gaming FPS, productivity performance, platform differences, power efficiency, pricing context, and upgrade path so you can see which CPU actually makes more sense.

Core i5-12400

2022

Why buy it

✅Better for gaming: +7.6% higher average FPS across 49 shared CPU benchmark tests.
✅Draws 65W instead of 125W, a 60W reduction.
✅100+% more PCIe lanes (20 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with UHD Graphics 730, while Xeon Silver 4509Y needs a discrete GPU.
✅Includes a boxed cooler (Yes), unlike Xeon Silver 4509Y.

Trade-offs

❌Smaller total L3 cache (18 MB vs 23 MB).
❌Less compelling for workstation-style loads than Xeon Silver 4509Y, which brings 8 cores / 16 threads.
❌Launch MSRP is still $209 MSRP, while Xeon Silver 4509Y mostly shows up through inconsistent older-market listings.

Xeon Silver 4509Y

2023

Why buy it

✅+25% larger total L3 cache (23 MB vs 18 MB).
✅Better for workstations and heavier parallel workloads: 8 cores / 16 threads.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400 across 49 shared CPU benchmark tests.
❌Lower PassMark (18,749 vs 18,794).
❌92.3% higher power demand at 125W vs 65W.
❌No integrated graphics, while Core i5-12400 can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Core i5-12400.

Core i5-12400

2022

Xeon Silver 4509Y

2023

Why buy it

✅Better for gaming: +7.6% higher average FPS across 49 shared CPU benchmark tests.
✅Draws 65W instead of 125W, a 60W reduction.
✅100+% more PCIe lanes (20 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with UHD Graphics 730, while Xeon Silver 4509Y needs a discrete GPU.
✅Includes a boxed cooler (Yes), unlike Xeon Silver 4509Y.

Why buy it

✅+25% larger total L3 cache (23 MB vs 18 MB).
✅Better for workstations and heavier parallel workloads: 8 cores / 16 threads.

Trade-offs

❌Smaller total L3 cache (18 MB vs 23 MB).
❌Less compelling for workstation-style loads than Xeon Silver 4509Y, which brings 8 cores / 16 threads.
❌Launch MSRP is still $209 MSRP, while Xeon Silver 4509Y mostly shows up through inconsistent older-market listings.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-12400 across 49 shared CPU benchmark tests.
❌Lower PassMark (18,749 vs 18,794).
❌92.3% higher power demand at 125W vs 65W.
❌No integrated graphics, while Core i5-12400 can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Core i5-12400.

Quick Answers

So, is Core i5-12400 better than Xeon Silver 4509Y?

Not in a simple one-size-fits-all way. Xeon Silver 4509Y makes more sense for workstation-style multi-core throughput, while Core i5-12400 is the better mainstream desktop choice for gaming, platform cost, and day-to-day practicality.

Which one is better for gaming?

If gaming is the priority, Core i5-12400 is the better pick here. According to our tests, it delivers 7.6% more average FPS across 49 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Core i5-12400 is the better fit. You are getting 0.2% better PassMark, backed by 6 cores and 12 threads.

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

Core i5-12400 is the smarter buy today. Core i5-12400 is at an unclear MSRP at $209 MSRP versus unclear MSRP, and it gives you a 7.6% average FPS lead across 49 shared CPU game tests in our data. It is also 100.0% better value on MSRP (89.9 vs 0.0 PassMark/$), so the better CPU is not just faster, it is also the cleaner value play on paper.

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

Xeon Silver 4509Y is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2023 vs 2022) and 25% larger total L3 cache (23 MB vs 18 MB). That makes it the safer long-term pick.

Games Benchmarks

Paired with RTX 4090

To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.

Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.

Core i5-12400 Benchmark Check

Xeon Silver 4509Y Benchmark Check

Path of Exile 2

Preset	Core i5-12400	Xeon Silver 4509Y
1080p
low	183 FPS	176 FPS
medium	168 FPS	142 FPS
high	139 FPS	116 FPS
ultra	119 FPS	92 FPS
1440p
low	153 FPS	143 FPS
medium	132 FPS	113 FPS
high	106 FPS	90 FPS
ultra	89 FPS	71 FPS
4K
low	87 FPS	66 FPS
medium	81 FPS	55 FPS
high	64 FPS	44 FPS
ultra	49 FPS	35 FPS

Open Core i5-12400 Open Xeon Silver 4509Y

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Core i5-12400	Xeon Silver 4509Y
1080p
low	470 FPS	469 FPS
medium	397 FPS	428 FPS
high	341 FPS	355 FPS
ultra	301 FPS	321 FPS
1440p
low	407 FPS	431 FPS
medium	351 FPS	382 FPS
high	309 FPS	324 FPS
ultra	265 FPS	282 FPS
4K
low	282 FPS	280 FPS
medium	248 FPS	250 FPS
high	229 FPS	228 FPS
ultra	196 FPS	204 FPS

Open Core i5-12400 Open Xeon Silver 4509Y

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Core i5-12400	Xeon Silver 4509Y
1080p
low	470 FPS	469 FPS
medium	470 FPS	469 FPS
high	470 FPS	469 FPS
ultra	470 FPS	469 FPS
1440p
low	470 FPS	469 FPS
medium	470 FPS	469 FPS
high	470 FPS	469 FPS
ultra	434 FPS	469 FPS
4K
low	442 FPS	469 FPS
medium	389 FPS	414 FPS
high	337 FPS	365 FPS
ultra	274 FPS	298 FPS

Open Core i5-12400 Open Xeon Silver 4509Y

League of Legends

League of Legends

Valorant

Preset	Core i5-12400	Xeon Silver 4509Y
1080p
low	470 FPS	469 FPS
medium	470 FPS	469 FPS
high	470 FPS	469 FPS
ultra	470 FPS	469 FPS
1440p
low	470 FPS	469 FPS
medium	470 FPS	469 FPS
high	470 FPS	469 FPS
ultra	470 FPS	453 FPS
4K
low	470 FPS	469 FPS
medium	450 FPS	428 FPS
high	391 FPS	383 FPS
ultra	330 FPS	332 FPS

Open Core i5-12400 Open Xeon Silver 4509Y

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Core i5-12400 and Xeon Silver 4509Y

Core i5-12400

The Core i5-12400 is manufactured by Intel. It was released in 4 January 2022 (3 years ago). It is based on the Alder Lake-S (2022) architecture. It features 6 cores and 12 threads. Base frequency is 2.5 GHz, with boost up to 4.4 GHz. L3 cache: 18 MB (total). L2 cache: 1.25 MB (per core). Built on Intel 7 nm process technology. Socket: LGA1700. Thermal design power (TDP): 65 Watt. Memory support: DDR5-4800, DDR4-3200. Passmark benchmark score: 18,794 points. Launch price was $299.

Xeon Silver 4509Y

The Xeon Silver 4509Y is manufactured by Intel. It was released in 14 December 2023 (1 year ago). It is based on the Sapphire Rapids (2023−2024) architecture. It features 8 cores and 16 threads. Base frequency is 2.6 GHz, with boost up to 4.1 GHz. L3 cache: 22.5 MB (total). L2 cache: 2 MB (per core). Built on Intel 7 nm process technology. Socket: LGA4677. Thermal design power (TDP): 125 Watt. Memory support: DDR5 @ 4400 MT/s (1 DPC &2DPC). Passmark benchmark score: 18,749 points. Launch price was $563.

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Processing Power

The Core i5-12400 packs 6 cores / 12 threads, while the Xeon Silver 4509Y offers 8 cores / 16 threads — the Xeon Silver 4509Y has 2 more cores. Boost clocks reach 4.4 GHz on the Core i5-12400 versus 4.1 GHz on the Xeon Silver 4509Y — a 7.1% clock advantage for the Core i5-12400 (base: 2.5 GHz vs 2.6 GHz). The Core i5-12400 uses the Alder Lake-S (2022) architecture (Intel 7 nm), while the Xeon Silver 4509Y uses Sapphire Rapids (2023−2024) (Intel 7 nm). In PassMark, the Core i5-12400 scores 18,794 against the Xeon Silver 4509Y's 18,749 — a 0.2% lead for the Core i5-12400. L3 cache: 18 MB (total) on the Core i5-12400 vs 22.5 MB (total) on the Xeon Silver 4509Y.

Feature	Core i5-12400	Xeon Silver 4509Y
Cores / Threads	6 / 12	8 / 16+33%
Boost Clock	4.4 GHz+7%	4.1 GHz
Base Clock	2.5 GHz	2.6 GHz+4%
L3 Cache	18 MB (total)	22.5 MB (total)+25%
L2 Cache	1.25 MB (per core)	2 MB (per core)+60%
Process	Intel 7 nm	Intel 7 nm
Architecture	Alder Lake-S (2022)	Sapphire Rapids (2023−2024)
PassMark	18,794	18,749
Cinebench R23 Multi	12,400	—
Geekbench 6 Single	2,381	—
Geekbench 6 Multi	10,632	—

🧠

Memory & Platform

The Core i5-12400 uses the LGA1700 socket (PCIe 5.0), while the Xeon Silver 4509Y uses LGA4677 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Core i5-12400	Xeon Silver 4509Y
Socket	LGA1700	LGA4677
PCIe Generation	PCIe 5.0+67%	PCIe 3.0
Max RAM Speed	DDR5-4800, DDR4-3200	—
Max RAM Capacity	128 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	20	—

🔧

Advanced Features

Virtualization: VT-x, VT-d, EPT (Core i5-12400) / not specified (Xeon Silver 4509Y). The Core i5-12400 includes integrated graphics (UHD Graphics 730), while the Xeon Silver 4509Y requires a dedicated GPU. Primary use case: Core i5-12400 targets Gaming Performance/Value. Direct competitor: Core i5-12400 rivals Ryzen 5 5600.