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 6521P

2025

Why buy it

✅+74.5% larger total L3 cache (144 MB vs 83 MB).
✅Costs $2,489 less on MSRP ($1,250 MSRP vs $3,739 MSRP).
✅Delivers 197.7% more PassMark for each dollar spent, at 51.8 vs 17.4 PassMark/$ ($1,250 MSRP vs $3,739 MSRP).
✅Draws 225W instead of 300W, a 75W reduction.
✅21.4% more PCIe lanes (136 vs 112) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon w9-3475X across 50 shared CPU benchmark tests.
❌Lower PassMark (64,761 vs 65,077).

Xeon w9-3475X

2023

Why buy it

✅Better for gaming: +15.2% higher average FPS across 50 shared CPU benchmark tests.

Trade-offs

❌Smaller total L3 cache (83 MB vs 144 MB).
❌Lower PassMark per dollar, at 17.4 vs 51.8 PassMark/$ ($3,739 MSRP vs $1,250 MSRP).
❌33.3% higher power demand at 300W vs 225W.

Xeon 6521P

2025

Xeon w9-3475X

2023

Why buy it

✅+74.5% larger total L3 cache (144 MB vs 83 MB).
✅Costs $2,489 less on MSRP ($1,250 MSRP vs $3,739 MSRP).
✅Delivers 197.7% more PassMark for each dollar spent, at 51.8 vs 17.4 PassMark/$ ($1,250 MSRP vs $3,739 MSRP).
✅Draws 225W instead of 300W, a 75W reduction.
✅21.4% more PCIe lanes (136 vs 112) for storage and expansion-heavy builds.

Why buy it

✅Better for gaming: +15.2% higher average FPS across 50 shared CPU benchmark tests.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon w9-3475X across 50 shared CPU benchmark tests.
❌Lower PassMark (64,761 vs 65,077).

Trade-offs

❌Smaller total L3 cache (83 MB vs 144 MB).
❌Lower PassMark per dollar, at 17.4 vs 51.8 PassMark/$ ($3,739 MSRP vs $1,250 MSRP).
❌33.3% higher power demand at 300W vs 225W.

Quick Answers

So, is Xeon w9-3475X better than Xeon 6521P?

Yes. Xeon w9-3475X is the better overall CPU here. You are getting a 15.2% average FPS lead across 50 shared CPU game tests in our data and 0.5% better PassMark, which makes it the stronger all-around choice.

Which one is better for gaming?

If gaming is the priority, Xeon w9-3475X is the better pick here. According to our tests, it delivers 15.2% more average FPS across 50 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Xeon w9-3475X is the better fit. You are getting 0.5% better PassMark, backed by 36 cores and 72 threads.

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

Xeon w9-3475X is still the faster CPU overall, but Xeon 6521P makes more sense if price matters more than absolute performance. Xeon w9-3475X is 199.1% more expensive on MSRP at $3,739 MSRP versus $1,250 MSRP, and it gives you a 15.2% average FPS lead across 50 shared CPU game tests in our data. Xeon 6521P is also 197.7% better value on MSRP (51.8 vs 17.4 PassMark/$), which is why it is easier to justify for price-conscious builds on paper.

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

Xeon 6521P is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2025 vs 2023) and 74.5% larger total L3 cache (144 MB vs 83 MB). 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 6521P Benchmark Check

Xeon w9-3475X Benchmark Check

Path of Exile 2

Preset	Xeon 6521P	Xeon w9-3475X
1080p
low	188 FPS	316 FPS
medium	165 FPS	306 FPS
high	131 FPS	246 FPS
ultra	106 FPS	207 FPS
1440p
low	155 FPS	274 FPS
medium	131 FPS	237 FPS
high	100 FPS	178 FPS
ultra	82 FPS	157 FPS
4K
low	70 FPS	186 FPS
medium	63 FPS	159 FPS
high	49 FPS	120 FPS
ultra	40 FPS	108 FPS

Open Xeon 6521P Open Xeon w9-3475X

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Xeon 6521P	Xeon w9-3475X
1080p
low	585 FPS	384 FPS
medium	517 FPS	332 FPS
high	428 FPS	270 FPS
ultra	376 FPS	236 FPS
1440p
low	489 FPS	308 FPS
medium	437 FPS	273 FPS
high	372 FPS	232 FPS
ultra	309 FPS	190 FPS
4K
low	304 FPS	181 FPS
medium	274 FPS	162 FPS
high	250 FPS	151 FPS
ultra	222 FPS	133 FPS

Open Xeon 6521P Open Xeon w9-3475X

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Xeon 6521P	Xeon w9-3475X
1080p
low	900 FPS	1025 FPS
medium	829 FPS	1086 FPS
high	768 FPS	1020 FPS
ultra	677 FPS	875 FPS
1440p
low	770 FPS	1009 FPS
medium	706 FPS	913 FPS
high	650 FPS	839 FPS
ultra	581 FPS	656 FPS
4K
low	510 FPS	605 FPS
medium	429 FPS	521 FPS
high	383 FPS	465 FPS
ultra	318 FPS	400 FPS

Open Xeon 6521P Open Xeon w9-3475X

League of Legends

League of Legends

Valorant

Preset	Xeon 6521P	Xeon w9-3475X
1080p
low	983 FPS	1304 FPS
medium	884 FPS	1015 FPS
high	764 FPS	1002 FPS
ultra	663 FPS	866 FPS
1440p
low	803 FPS	1061 FPS
medium	699 FPS	918 FPS
high	601 FPS	800 FPS
ultra	517 FPS	656 FPS
4K
low	579 FPS	784 FPS
medium	520 FPS	685 FPS
high	461 FPS	583 FPS
ultra	396 FPS	437 FPS

Open Xeon 6521P Open Xeon w9-3475X

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Xeon 6521P and Xeon w9-3475X

Xeon 6521P

The Xeon 6521P is manufactured by Intel. It was released in 24 February 2025 (less than a year ago). It is based on the Granite Rapids (2024−2025) architecture. It features 24 cores and 48 threads. Base frequency is 2.6 GHz, with boost up to 4.1 GHz. L3 cache: 144 MB (total). L2 cache: 2 MB (per core). Built on Intel 3 nm process technology. Socket: LGA4710. Thermal design power (TDP): 225 Watt. Memory support: DDR5(6400MT/s). Passmark benchmark score: 64,761 points. Launch price was $1,250.

Xeon w9-3475X

The Xeon w9-3475X is manufactured by Intel. It was released in 15 February 2023 (2 years ago). It is based on the Sapphire Rapids (2023−2024) architecture. It features 36 cores and 72 threads. Base frequency is 2.2 GHz, with boost up to 4.8 GHz. L3 cache: 82.5 MB. L2 cache: 2 MB (per core). Built on Intel 7 nm process technology. Socket: LGA4677. Thermal design power (TDP): 300 Watt. Memory support: DDR5-4800. Passmark benchmark score: 65,077 points. Launch price was $3,739.

⚡

Processing Power

The Xeon 6521P packs 24 cores / 48 threads, while the Xeon w9-3475X offers 36 cores / 72 threads — the Xeon w9-3475X has 12 more cores. Boost clocks reach 4.1 GHz on the Xeon 6521P versus 4.8 GHz on the Xeon w9-3475X — a 15.7% clock advantage for the Xeon w9-3475X (base: 2.6 GHz vs 2.2 GHz). The Xeon 6521P uses the Granite Rapids (2024−2025) architecture (Intel 3 nm), while the Xeon w9-3475X uses Sapphire Rapids (2023−2024) (Intel 7 nm). In PassMark, the Xeon 6521P scores 64,761 against the Xeon w9-3475X's 65,077 — a 0.5% lead for the Xeon w9-3475X. L3 cache: 144 MB (total) on the Xeon 6521P vs 82.5 MB on the Xeon w9-3475X.

Feature	Xeon 6521P	Xeon w9-3475X
Cores / Threads	24 / 48	36 / 72+50%
Boost Clock	4.1 GHz	4.8 GHz+17%
Base Clock	2.6 GHz+18%	2.2 GHz
L3 Cache	144 MB (total)+75%	82.5 MB
L2 Cache	2 MB (per core)	2 MB (per core)
Process	Intel 3 nm-57%	Intel 7 nm
Architecture	Granite Rapids (2024−2025)	Sapphire Rapids (2023−2024)
PassMark	64,761	65,077
Geekbench 6 Single	—	1,814
Geekbench 6 Multi	—	44,869

🧠

Memory & Platform

The Xeon 6521P uses the LGA4710 socket (PCIe 5.0), while the Xeon w9-3475X uses LGA4677 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 6400 on the Xeon 6521P versus DDR5-4800 on the Xeon w9-3475X — the Xeon 6521P supports 199.7% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 4096 of RAM. Both feature 8-channel memory with ECC support. PCIe lanes: 136 (Xeon 6521P) vs 112 (Xeon w9-3475X) — the Xeon 6521P offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: C741 (Xeon 6521P) and W790 (Xeon w9-3475X).

Feature	Xeon 6521P	Xeon w9-3475X
Socket	LGA4710	LGA4677
PCIe Generation	PCIe 5.0	PCIe 5.0
Max RAM Speed	6400+127900%	DDR5-4800
Max RAM Capacity	4096	4096 GB+104857500%
RAM Channels	8	8
ECC Support	Yes	Yes
PCIe Lanes	136+21%	112

🔧

Advanced Features

Only the Xeon w9-3475X has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support AVX-512 instructions, benefiting scientific computing, AI inference, and encryption workloads. Virtualization support: VT-x, VT-d (Xeon 6521P) vs true (Xeon w9-3475X). Direct competitor: Xeon 6521P rivals EPYC 9354; Xeon w9-3475X rivals Threadripper PRO 7965WX.

Feature	Xeon 6521P	Xeon w9-3475X
Integrated GPU	No	No
IGPU Model	None	None
Unlocked	No	Yes
AVX-512	Yes	Yes
Virtualization	VT-x, VT-d	true

💰

Value Analysis

The Xeon 6521P launched at $1250 MSRP, while the Xeon w9-3475X debuted at $3739. On MSRP ($1250 vs $3739), the Xeon 6521P is $2489 cheaper. In terms of value on MSRP (PassMark points per dollar), the Xeon 6521P delivers 51.8 pts/$ vs 17.4 pts/$ for the Xeon w9-3475X — making the Xeon 6521P the 99.4% better value option.