CPU
GPU
Xeon 6521P
Core Ultra 9 285K
Performance Spectrum - CPU
About PassMark
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.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon 6521P
Performance Per Dollar Core Ultra 9 285K
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon 6521P | Core Ultra 9 285K |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($1,250) | ✅ More affordable ($550) |
| Longevity | ✨ Modern (Granite Rapids (2024−2025) / Intel 3 nm) | ✨ Modern (Arrow Lake-S (2024−2025) / 3 nm) |
💎 Value Proposition
| Insight | Xeon 6521P | Core Ultra 9 285K |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ✅ Better overall value (+137%) |
| Upfront Cost | ⚠️ Higher cost ($1,250) | ✅ More affordable ($550) |
Performance Check
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.
Technical Specifications
Side-by-side comparison of Xeon 6521P and Core Ultra 9 285K
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.
Core Ultra 9 285K
The Core Ultra 9 285K is manufactured by Intel. It was released in 24 October 2024 (1 year ago). It is based on the Arrow Lake-S (2024−2025) architecture. It features 24 cores and 24 threads. Base frequency is 3.7 GHz, with boost up to 5.6 GHz. L3 cache: 36 MB (total). L2 cache: 3 MB (per core). Built on 3 nm process technology. Socket: LGA1851. Thermal design power (TDP): 125 Watt. Memory support: DDR5-6400. Passmark benchmark score: 67,482 points. Launch price was $589.
Processing Power
The Xeon 6521P packs 24 cores / 48 threads, matching the Core Ultra 9 285K's 24 cores. Boost clocks reach 4.1 GHz on the Xeon 6521P versus 5.6 GHz on the Core Ultra 9 285K — a 30.9% clock advantage for the Core Ultra 9 285K (base: 2.6 GHz vs 3.7 GHz). The Xeon 6521P uses the Granite Rapids (2024−2025) architecture (Intel 3 nm), while the Core Ultra 9 285K uses Arrow Lake-S (2024−2025) (3 nm). In PassMark, the Xeon 6521P scores 64,761 against the Core Ultra 9 285K's 67,482 — a 4.1% lead for the Core Ultra 9 285K. L3 cache: 144 MB (total) on the Xeon 6521P vs 36 MB (total) on the Core Ultra 9 285K.
| Feature | Xeon 6521P | Core Ultra 9 285K |
|---|---|---|
| Cores / Threads | 24 / 48 | 24 / 24 |
| Boost Clock | 4.1 GHz | 5.6 GHz+37% |
| Base Clock | 2.6 GHz | 3.7 GHz+42% |
| L3 Cache | 144 MB (total)+300% | 36 MB (total) |
| L2 Cache | 2 MB (per core) | 3 MB (per core)+50% |
| Process | Intel 3 nm | 3 nm |
| Architecture | Granite Rapids (2024−2025) | Arrow Lake-S (2024−2025) |
| PassMark | 64,761 | 67,482+4% |
| Cinebench R23 Multi | — | 45,563 |
| Geekbench 6 Single | — | 3,200 |
| Geekbench 6 Multi | — | 22,563 |
Memory & Platform
The Xeon 6521P uses the LGA4710 socket (PCIe 5.0), while the Core Ultra 9 285K uses LGA1851 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 6400 on the Xeon 6521P versus DDR5-6400 on the Core Ultra 9 285K — 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 192 GB — 182.1% more capacity for professional workloads. Memory channels: 8 (Xeon 6521P) vs 2 (Core Ultra 9 285K). PCIe lanes: 136 (Xeon 6521P) vs 24 (Core Ultra 9 285K) — the Xeon 6521P offers 112 more lanes for additional GPUs or NVMe drives. Chipset compatibility: C741 (Xeon 6521P) and Z890 (Core Ultra 9 285K).
| Feature | Xeon 6521P | Core Ultra 9 285K |
|---|---|---|
| Socket | LGA4710 | LGA1851 |
| PCIe Generation | PCIe 5.0 | PCIe 5.0 |
| Max RAM Speed | 6400+127900% | DDR5-6400 |
| Max RAM Capacity | 4096 | 192 GB+4915100% |
| RAM Channels | 8+300% | 2 |
| ECC Support | ✅ | ✅ |
| PCIe Lanes | 136+467% | 24 |
Advanced Features
Only the Core Ultra 9 285K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Xeon 6521P supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x, VT-d (Xeon 6521P) vs true (Core Ultra 9 285K). The Core Ultra 9 285K includes integrated graphics (Intel Arc Graphics 64EU), while the Xeon 6521P requires a dedicated GPU. Direct competitor: Xeon 6521P rivals EPYC 9354; Core Ultra 9 285K rivals Ryzen 9 9950X.
| Feature | Xeon 6521P | Core Ultra 9 285K |
|---|---|---|
| Integrated GPU | No | Yes |
| IGPU Model | None | Intel Arc Graphics 64EU |
| Unlocked | No | Yes |
| AVX-512 | Yes | No |
| Virtualization | VT-x, VT-d | true |
Value Analysis
The Xeon 6521P launched at $1250 MSRP, while the Core Ultra 9 285K debuted at $589. At current prices ($1250 vs $550), the Core Ultra 9 285K is $700 cheaper. In terms of value (PassMark points per dollar), the Xeon 6521P delivers 51.8 pts/$ vs 122.7 pts/$ for the Core Ultra 9 285K — making the Core Ultra 9 285K the 81.2% better value option.
| Feature | Xeon 6521P | Core Ultra 9 285K |
|---|---|---|
| MSRP | $1250 | $589-53% |
| Avg Price (30d) | $1250 | $550-56% |
| Performance per Dollar | 51.8 | 122.7+137% |
| Release Date | 2025 | 2024 |
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