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 6520P

2025

Why buy it

✅Draws 210W instead of 225W, a 15W reduction.

Trade-offs

❌Lower PassMark (64,010 vs 64,761).
❌
3.6% HIGHER MSRP
$1,295 MSRPvs$1,250 MSRP

Xeon 6521P

2025

Why buy it

✅Costs $45 less on MSRP ($1,250 MSRP vs $1,295 MSRP).
✅54.5% more PCIe lanes (136 vs 88) for storage and expansion-heavy builds.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Xeon 6520P

2025

Xeon 6521P

2025

Why buy it

✅Draws 210W instead of 225W, a 15W reduction.

Why buy it

✅Costs $45 less on MSRP ($1,250 MSRP vs $1,295 MSRP).
✅54.5% more PCIe lanes (136 vs 88) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark (64,010 vs 64,761).
❌
3.6% HIGHER MSRP
$1,295 MSRPvs$1,250 MSRP

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Quick Answers

So, is Xeon 6521P better than Xeon 6520P?

Yes. Xeon 6521P is the better overall CPU here. You are getting a 0.7% average FPS lead across 49 shared CPU game tests in our data, 1.2% 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 6521P is the better pick here. According to our tests, it delivers 0.7% 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 6521P is the better fit. You are getting 1.2% better PassMark, backed by 24 cores and 48 threads.

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

Xeon 6521P is the smarter buy today. Xeon 6521P is $45 cheaper on MSRP at $1,250 MSRP versus $1,295 MSRP, and it gives you a 0.7% average FPS lead across 49 shared CPU game tests in our data. It is also 4.8% better value on MSRP (51.8 vs 49.4 PassMark/$), 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 6521P is the more future-proof choice for 2026 and beyond. You are getting more multi-core headroom with 24 cores / 48 threads instead of 24/48. That extra cache should hold up really well in CPU-limited games and high-refresh builds.

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 6520P Benchmark Check

Xeon 6521P Benchmark Check

Path of Exile 2

Preset	Xeon 6520P	Xeon 6521P
1080p
low	188 FPS	188 FPS
medium	165 FPS	165 FPS
high	131 FPS	131 FPS
ultra	106 FPS	106 FPS
1440p
low	155 FPS	155 FPS
medium	131 FPS	131 FPS
high	100 FPS	100 FPS
ultra	82 FPS	82 FPS
4K
low	70 FPS	70 FPS
medium	63 FPS	63 FPS
high	49 FPS	49 FPS
ultra	40 FPS	40 FPS

Open Xeon 6520P Open Xeon 6521P

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Xeon 6520P	Xeon 6521P
1080p
low	520 FPS	585 FPS
medium	460 FPS	517 FPS
high	375 FPS	428 FPS
ultra	309 FPS	376 FPS
1440p
low	425 FPS	489 FPS
medium	383 FPS	437 FPS
high	321 FPS	372 FPS
ultra	256 FPS	309 FPS
4K
low	262 FPS	304 FPS
medium	239 FPS	274 FPS
high	212 FPS	250 FPS
ultra	176 FPS	222 FPS

Open Xeon 6520P Open Xeon 6521P

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Xeon 6520P	Xeon 6521P
1080p
low	910 FPS	900 FPS
medium	838 FPS	829 FPS
high	791 FPS	768 FPS
ultra	698 FPS	677 FPS
1440p
low	782 FPS	770 FPS
medium	716 FPS	706 FPS
high	673 FPS	650 FPS
ultra	601 FPS	581 FPS
4K
low	528 FPS	510 FPS
medium	444 FPS	429 FPS
high	396 FPS	383 FPS
ultra	330 FPS	318 FPS

Open Xeon 6520P Open Xeon 6521P

League of Legends

League of Legends

Valorant

Preset	Xeon 6520P	Xeon 6521P
1080p
low	985 FPS	983 FPS
medium	887 FPS	884 FPS
high	767 FPS	764 FPS
ultra	666 FPS	663 FPS
1440p
low	804 FPS	803 FPS
medium	700 FPS	699 FPS
high	603 FPS	601 FPS
ultra	519 FPS	517 FPS
4K
low	580 FPS	579 FPS
medium	521 FPS	520 FPS
high	462 FPS	461 FPS
ultra	398 FPS	396 FPS

Open Xeon 6520P Open Xeon 6521P

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Xeon 6520P and Xeon 6521P

Xeon 6520P

The Xeon 6520P 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 2.4 GHz, with boost up to 4 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): 210 Watt. Memory support: DDR5(6400MT/s). Passmark benchmark score: 64,010 points. Launch price was $1,295.

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.

⚡

Processing Power

Both the Xeon 6520P and Xeon 6521P share an identical 24-core/48-thread configuration. Boost clocks reach 4 GHz on the Xeon 6520P versus 4.1 GHz on the Xeon 6521P — a 2.5% clock advantage for the Xeon 6521P (base: 2.4 GHz vs 2.6 GHz). Both are built on the Granite Rapids (2024−2025) architecture using a Intel 3 nm process. In PassMark, the Xeon 6520P scores 64,010 against the Xeon 6521P's 64,761 — a 1.2% lead for the Xeon 6521P. Both processors carry 144 MB (total) of L3 cache.

Feature	Xeon 6520P	Xeon 6521P
Cores / Threads	24 / 48	24 / 48
Boost Clock	4 GHz	4.1 GHz+2%
Base Clock	2.4 GHz	2.6 GHz+8%
L3 Cache	144 MB (total)	144 MB (total)
L2 Cache	2 MB (per core)	2 MB (per core)
Process	Intel 3 nm	Intel 3 nm
Architecture	Granite Rapids (2024−2025)	Granite Rapids (2024−2025)
PassMark	64,010	64,761+1%
Geekbench 6 Single	1,900	—
Geekbench 6 Multi	25,000	—

🧠

Memory & Platform

Both processors use the LGA4710 socket with PCIe 5.0. Maximum memory speed reaches DDR5-6400 on the Xeon 6520P versus 6400 on the Xeon 6521P — the Xeon 6521P supports 199.7% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Xeon 6521P supports up to 4096 of RAM compared to 4 TB — 199.6% more capacity for professional workloads. Both feature 8-channel memory with ECC support. PCIe lanes: 88 (Xeon 6520P) vs 136 (Xeon 6521P) — the Xeon 6521P offers 48 more lanes for additional GPUs or NVMe drives. Chipset compatibility: FCLGA4710 (Xeon 6520P) and C741 (Xeon 6521P).

Feature	Xeon 6520P	Xeon 6521P
Socket	LGA4710	LGA4710
PCIe Generation	PCIe 5.0	PCIe 5.0
Max RAM Speed	DDR5-6400	6400+127900%
Max RAM Capacity	4 TB+104857500%	4096
RAM Channels	8	8
ECC Support	Yes	Yes
PCIe Lanes	88	136+55%

🔧

Advanced Features

Neither processor supports overclocking. Both support AVX-512 instructions, benefiting scientific computing, AI inference, and encryption workloads. Both support VT-x, VT-d virtualization. Primary use case: Xeon 6520P targets Server. Direct competitor: Xeon 6520P rivals EPYC 9254; Xeon 6521P rivals EPYC 9354.

Feature	Xeon 6520P	Xeon 6521P
Integrated GPU	No	No
IGPU Model	None	None
Unlocked	No	No
AVX-512	Yes	Yes
Virtualization	VT-x, VT-d	VT-x, VT-d
Target Use	Server	—

💰

Value Analysis

The Xeon 6520P launched at $1295 MSRP, while the Xeon 6521P debuted at $1250. On MSRP ($1295 vs $1250), the Xeon 6521P is $45 cheaper. In terms of value on MSRP (PassMark points per dollar), the Xeon 6520P delivers 49.4 pts/$ vs 51.8 pts/$ for the Xeon 6521P — making the Xeon 6521P the 4.7% better value option.