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 i9-11900T

2021

Why buy it

✅Better for gaming: +17.0% higher average FPS across 49 shared CPU benchmark tests.
✅Draws 35W instead of 125W, a 90W reduction.
✅100+% more PCIe lanes (20 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel UHD Graphics 750, while Xeon Silver 4509Y needs a discrete GPU.
✅Includes a boxed cooler (Stock), unlike Xeon Silver 4509Y.

Trade-offs

❌Lower PassMark (18,620 vs 18,749).
❌Smaller total L3 cache (16 MB vs 23 MB).
❌Launch MSRP is still $439 MSRP, while Xeon Silver 4509Y mostly shows up through inconsistent older-market listings.
❌Older platform position on LGA1200 with DDR4, while Xeon Silver 4509Y moves to LGA4677 and DDR5.

Xeon Silver 4509Y

2023

Why buy it

✅+0.7% higher PassMark.
✅+40.6% larger total L3 cache (23 MB vs 16 MB).
✅Newer platform on LGA4677 with DDR5 support instead of LGA1200 and DDR4.

Trade-offs

❌Worse for gaming: lower average FPS than Core i9-11900T across 49 shared CPU benchmark tests.
❌257.1% higher power demand at 125W vs 35W.
❌No integrated graphics, while Core i9-11900T can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Core i9-11900T.

Core i9-11900T

2021

Xeon Silver 4509Y

2023

Why buy it

✅Better for gaming: +17.0% higher average FPS across 49 shared CPU benchmark tests.
✅Draws 35W instead of 125W, a 90W reduction.
✅100+% more PCIe lanes (20 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel UHD Graphics 750, while Xeon Silver 4509Y needs a discrete GPU.
✅Includes a boxed cooler (Stock), unlike Xeon Silver 4509Y.

Why buy it

✅+0.7% higher PassMark.
✅+40.6% larger total L3 cache (23 MB vs 16 MB).
✅Newer platform on LGA4677 with DDR5 support instead of LGA1200 and DDR4.

Trade-offs

❌Lower PassMark (18,620 vs 18,749).
❌Smaller total L3 cache (16 MB vs 23 MB).
❌Launch MSRP is still $439 MSRP, while Xeon Silver 4509Y mostly shows up through inconsistent older-market listings.
❌Older platform position on LGA1200 with DDR4, while Xeon Silver 4509Y moves to LGA4677 and DDR5.

Trade-offs

❌Worse for gaming: lower average FPS than Core i9-11900T across 49 shared CPU benchmark tests.
❌257.1% higher power demand at 125W vs 35W.
❌No integrated graphics, while Core i9-11900T can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Core i9-11900T.

Quick Answers

So, is Core i9-11900T 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 i9-11900T is the better mainstream desktop choice for gaming, platform cost, and day-to-day practicality.

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 0.7% better PassMark, backed by 8 cores and 16 threads. It also carries the larger cache pool with 40.6% larger total L3 cache (23 MB vs 16 MB).

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

Core i9-11900T is the smarter buy today. Core i9-11900T is at an unclear MSRP at $439 MSRP versus unclear MSRP, and it gives you a 17.0% average FPS lead across 49 shared CPU game tests in our data. The trade-off is that Xeon Silver 4509Y is still stronger for heavier multi-core work with 0.7% better PassMark. It is also 100.0% better value on MSRP (42.4 vs 0.0 PassMark/$), 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 2021), a healthier platform with LGA4677 and DDR5 instead of LGA1200, 40.6% larger total L3 cache (23 MB vs 16 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.

Core i9-11900T Benchmark Check

Xeon Silver 4509Y Benchmark Check

Path of Exile 2

Preset	Core i9-11900T	Xeon Silver 4509Y
1080p
low	286 FPS	176 FPS
medium	256 FPS	142 FPS
high	217 FPS	116 FPS
ultra	187 FPS	92 FPS
1440p
low	235 FPS	143 FPS
medium	189 FPS	113 FPS
high	155 FPS	90 FPS
ultra	137 FPS	71 FPS
4K
low	164 FPS	66 FPS
medium	133 FPS	55 FPS
high	103 FPS	44 FPS
ultra	91 FPS	35 FPS

Open Core i9-11900T Open Xeon Silver 4509Y

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Core i9-11900T	Xeon Silver 4509Y
1080p
low	288 FPS	469 FPS
medium	234 FPS	428 FPS
high	211 FPS	355 FPS
ultra	187 FPS	321 FPS
1440p
low	244 FPS	431 FPS
medium	207 FPS	382 FPS
high	186 FPS	324 FPS
ultra	160 FPS	282 FPS
4K
low	171 FPS	280 FPS
medium	148 FPS	250 FPS
high	141 FPS	228 FPS
ultra	122 FPS	204 FPS

Open Core i9-11900T Open Xeon Silver 4509Y

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Core i9-11900T	Xeon Silver 4509Y
1080p
low	466 FPS	469 FPS
medium	466 FPS	469 FPS
high	466 FPS	469 FPS
ultra	466 FPS	469 FPS
1440p
low	466 FPS	469 FPS
medium	466 FPS	469 FPS
high	466 FPS	469 FPS
ultra	430 FPS	469 FPS
4K
low	466 FPS	469 FPS
medium	442 FPS	414 FPS
high	390 FPS	365 FPS
ultra	324 FPS	298 FPS

Open Core i9-11900T Open Xeon Silver 4509Y

League of Legends

League of Legends

Valorant

Preset	Core i9-11900T	Xeon Silver 4509Y
1080p
low	466 FPS	469 FPS
medium	466 FPS	469 FPS
high	466 FPS	469 FPS
ultra	466 FPS	469 FPS
1440p
low	466 FPS	469 FPS
medium	466 FPS	469 FPS
high	466 FPS	469 FPS
ultra	466 FPS	453 FPS
4K
low	466 FPS	469 FPS
medium	466 FPS	428 FPS
high	466 FPS	383 FPS
ultra	423 FPS	332 FPS

Open Core i9-11900T Open Xeon Silver 4509Y

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Core i9-11900T and Xeon Silver 4509Y

Core i9-11900T

The Core i9-11900T is manufactured by Intel. It was released in 16 March 2021 (4 years ago). It is based on the Rocket Lake (2021) architecture. It features 8 cores and 16 threads. Base frequency is 1.5 GHz, with boost up to 4.9 GHz. L3 cache: 16 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1200. Thermal design power (TDP): 35 Watt. Memory support: DDR4-3200. Passmark benchmark score: 18,620 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.

⚡

Processing Power

Both the Core i9-11900T and Xeon Silver 4509Y share an identical 8-core/16-thread configuration. Boost clocks reach 4.9 GHz on the Core i9-11900T versus 4.1 GHz on the Xeon Silver 4509Y — a 17.8% clock advantage for the Core i9-11900T (base: 1.5 GHz vs 2.6 GHz). The Core i9-11900T uses the Rocket Lake (2021) architecture (14 nm), while the Xeon Silver 4509Y uses Sapphire Rapids (2023−2024) (Intel 7 nm). In PassMark, the Core i9-11900T scores 18,620 against the Xeon Silver 4509Y's 18,749 — a 0.7% lead for the Xeon Silver 4509Y. L3 cache: 16 MB (total) on the Core i9-11900T vs 22.5 MB (total) on the Xeon Silver 4509Y.

Feature	Core i9-11900T	Xeon Silver 4509Y
Cores / Threads	8 / 16	8 / 16
Boost Clock	4.9 GHz+20%	4.1 GHz
Base Clock	1.5 GHz	2.6 GHz+73%
L3 Cache	16 MB (total)	22.5 MB (total)+41%
L2 Cache	256K (per core)	2 MB (per core)+700%
Process	14 nm	Intel 7 nm-50%
Architecture	Rocket Lake (2021)	Sapphire Rapids (2023−2024)
PassMark	18,620	18,749
Geekbench 6 Single	2,100	—
Geekbench 6 Multi	9,200	—

🧠

Memory & Platform

The Core i9-11900T uses the LGA1200 socket (PCIe 3.0), while the Xeon Silver 4509Y uses LGA4677 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Core i9-11900T	Xeon Silver 4509Y
Socket	LGA1200	LGA4677
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-3200	—
Max RAM Capacity	128 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	20	—

🔧

Advanced Features

Virtualization: VT-x, VT-d (Core i9-11900T) / not specified (Xeon Silver 4509Y). The Core i9-11900T includes integrated graphics (Intel UHD Graphics 750), while the Xeon Silver 4509Y requires a dedicated GPU. Primary use case: Core i9-11900T targets Low Power High Perf Desktop.