Xeon Silver 4309Y vs Xeon Silver 4509Y

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.

Xeon Silver 4309Y

2021

Why buy it

✅Draws 105W instead of 125W, a 20W reduction.

Trade-offs

❌Lower PassMark (18,718 vs 18,749).
❌Smaller total L3 cache (12 MB vs 23 MB).
❌Older platform position on LGA4189 with DDR4, while Xeon Silver 4509Y moves to LGA4677 and DDR5.

Xeon Silver 4509Y

2023

Why buy it

✅+87.5% larger total L3 cache (23 MB vs 12 MB).
✅Newer platform on LGA4677 with DDR5 support instead of LGA4189 and DDR4.

Trade-offs

❌19% higher power demand at 125W vs 105W.

Xeon Silver 4309Y

2021

Xeon Silver 4509Y

2023

Why buy it

✅Draws 105W instead of 125W, a 20W reduction.

Why buy it

✅+87.5% larger total L3 cache (23 MB vs 12 MB).
✅Newer platform on LGA4677 with DDR5 support instead of LGA4189 and DDR4.

Trade-offs

❌Lower PassMark (18,718 vs 18,749).
❌Smaller total L3 cache (12 MB vs 23 MB).
❌Older platform position on LGA4189 with DDR4, while Xeon Silver 4509Y moves to LGA4677 and DDR5.

Trade-offs

❌19% higher power demand at 125W vs 105W.

Quick Answers

So, is Xeon Silver 4509Y better than Xeon Silver 4309Y?

Yes. Xeon Silver 4509Y is the better overall CPU here. You are getting a 0.2% average FPS lead across 49 shared CPU game tests in our data, 0.2% better PassMark, and the stronger long-term platform, which makes it the stronger all-around choice.

Which one is better for gaming?

If gaming is the priority, Xeon Silver 4509Y is the better pick here. According to our tests, it delivers 0.2% 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, Xeon Silver 4509Y is the better fit. You are getting 0.2% better PassMark, backed by 8 cores and 16 threads. It also carries the larger cache pool with 87.5% larger total L3 cache (23 MB vs 12 MB).

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

Xeon Silver 4509Y still looks like the safer overall buy. Xeon Silver 4509Y is at an unclear MSRP at unclear MSRP versus unclear MSRP, and it gives you a 0.2% average FPS lead across 49 shared CPU game tests in our data.

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 2021), a healthier platform with LGA4677 and DDR5 instead of LGA4189, 87.5% larger total L3 cache (23 MB vs 12 MB), and more multi-core headroom with 8 cores / 16 threads instead of 8/16. That should give you a better long-term upgrade path for motherboard, RAM, and future CPU swaps.

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.

Xeon Silver 4309Y Benchmark Check

Xeon Silver 4509Y Benchmark Check

Path of Exile 2

Preset	Xeon Silver 4309Y	Xeon Silver 4509Y
1080p
low	174 FPS	176 FPS
medium	138 FPS	142 FPS
high	114 FPS	116 FPS
ultra	90 FPS	92 FPS
1440p
low	144 FPS	143 FPS
medium	113 FPS	113 FPS
high	91 FPS	90 FPS
ultra	72 FPS	71 FPS
4K
low	67 FPS	66 FPS
medium	56 FPS	55 FPS
high	44 FPS	44 FPS
ultra	35 FPS	35 FPS

Open Xeon Silver 4309Y Open Xeon Silver 4509Y

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Xeon Silver 4309Y	Xeon Silver 4509Y
1080p
low	245 FPS	469 FPS
medium	212 FPS	428 FPS
high	191 FPS	355 FPS
ultra	151 FPS	321 FPS
1440p
low	217 FPS	431 FPS
medium	193 FPS	382 FPS
high	176 FPS	324 FPS
ultra	140 FPS	282 FPS
4K
low	176 FPS	280 FPS
medium	161 FPS	250 FPS
high	138 FPS	228 FPS
ultra	107 FPS	204 FPS

Open Xeon Silver 4309Y Open Xeon Silver 4509Y

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Xeon Silver 4309Y	Xeon Silver 4509Y
1080p
low	468 FPS	469 FPS
medium	468 FPS	469 FPS
high	468 FPS	469 FPS
ultra	468 FPS	469 FPS
1440p
low	468 FPS	469 FPS
medium	468 FPS	469 FPS
high	468 FPS	469 FPS
ultra	468 FPS	469 FPS
4K
low	468 FPS	469 FPS
medium	378 FPS	414 FPS
high	334 FPS	365 FPS
ultra	272 FPS	298 FPS

Open Xeon Silver 4309Y Open Xeon Silver 4509Y

League of Legends

League of Legends

Valorant

Preset	Xeon Silver 4309Y	Xeon Silver 4509Y
1080p
low	468 FPS	469 FPS
medium	468 FPS	469 FPS
high	468 FPS	469 FPS
ultra	468 FPS	469 FPS
1440p
low	468 FPS	469 FPS
medium	468 FPS	469 FPS
high	468 FPS	469 FPS
ultra	468 FPS	453 FPS
4K
low	468 FPS	469 FPS
medium	464 FPS	428 FPS
high	414 FPS	383 FPS
ultra	353 FPS	332 FPS

Open Xeon Silver 4309Y Open Xeon Silver 4509Y

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Xeon Silver 4309Y and Xeon Silver 4509Y

Xeon Silver 4309Y

The Xeon Silver 4309Y is manufactured by Intel. It was released in 2015-01-01. It is based on the Ice Lake-SP (2021) architecture. It features 8 cores and 16 threads. Base frequency is 2.8 GHz, with boost up to 3.6 GHz. L3 cache: 12 MB (total). L2 cache: 1 MB (per core). Built on 10 nm process technology. Socket: LGA4189. Thermal design power (TDP): 105 Watt. Memory support: DDR4-2667. Passmark benchmark score: 18,718 points. Launch price was $800.

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

Both the Xeon Silver 4309Y and Xeon Silver 4509Y share an identical 8-core/16-thread configuration. Boost clocks reach 3.6 GHz on the Xeon Silver 4309Y versus 4.1 GHz on the Xeon Silver 4509Y — a 13% clock advantage for the Xeon Silver 4509Y (base: 2.8 GHz vs 2.6 GHz). The Xeon Silver 4309Y uses the Ice Lake-SP (2021) architecture (10 nm), while the Xeon Silver 4509Y uses Sapphire Rapids (2023−2024) (Intel 7 nm). In PassMark, the Xeon Silver 4309Y scores 18,718 against the Xeon Silver 4509Y's 18,749 — a 0.2% lead for the Xeon Silver 4509Y. L3 cache: 12 MB (total) on the Xeon Silver 4309Y vs 22.5 MB (total) on the Xeon Silver 4509Y.

Feature	Xeon Silver 4309Y	Xeon Silver 4509Y
Cores / Threads	8 / 16	8 / 16
Boost Clock	3.6 GHz	4.1 GHz+14%
Base Clock	2.8 GHz+8%	2.6 GHz
L3 Cache	12 MB (total)	22.5 MB (total)+88%
L2 Cache	1 MB (per core)	2 MB (per core)+100%
Process	10 nm	Intel 7 nm-30%
Architecture	Ice Lake-SP (2021)	Sapphire Rapids (2023−2024)
PassMark	18,718	18,749

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Memory & Platform

The Xeon Silver 4309Y uses the LGA4189 socket (PCIe 4.0), while the Xeon Silver 4509Y uses LGA4677 (PCIe 3.0) — making them incompatible on the same motherboard.