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.

Xeon 6521P vs Xeon w9-3475X 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.

Xeon 6521P vs Xeon w9-3475X: Pros, Cons & Final Verdict

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

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.

Quick Answers

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

Yes. Xeon w9-3475X is the better all-around CPU here. It gives you a 15.2% average FPS lead across 50 shared CPU game tests in our data and 0.5% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Xeon w9-3475X is the better pick. 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 stronger 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 is easier to justify if budget matters more than peak performance. Xeon w9-3475X comes in 199.1% more expensive on MSRP at $3,739 MSRP versus $1,250 MSRP, and it still gives you a 15.2% average FPS lead across 50 shared CPU game tests in our data. Xeon 6521P is also 197.7% better value on MSRP (51.8 vs 17.4 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Xeon 6521P makes more sense long term 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 gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Xeon 6521P vs Xeon w9-3475X Technical Specifications

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

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.

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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

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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 33.3% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 4096 GB 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+33%	DDR5-4800
Max RAM Capacity	4096 GB	4096 GB
RAM Channels	8	8
ECC Support	Yes	Yes
PCIe Lanes	136+21%	112

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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

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Value Analysis

At launch, the Xeon 6521P was priced at $1250, while the Xeon w9-3475X came in at $3739. On launch pricing ($1250 vs $3739), Xeon 6521P was $2489 cheaper. In terms of value on MSRP (PassMark points per dollar), the Xeon 6521P delivers 51.8 pts/$ vs 17.4 pts/$ for the Xeon w9-3475X — making the Xeon 6521P the 99.4% better value option.

Feature	Xeon 6521P	Xeon w9-3475X
MSRP	$1250-67%	$3739
Performance per Dollar	51.8+198%	17.4
Release Date	2025	2023

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