Phenom II X4 965 BE (125W) vs Xeon E5520

Phenom II X4 965 BE (125W) vs Xeon E5520 Performance Spectrum

Phenom II X4 965 BE (125W)

4 / 4

2,544

+0.1%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Xeon E5520

4 / 8

2,541

0.0%

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.

Phenom II X4 965 BE (125W) vs Xeon E5520 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.

Phenom II X4 965 BE (125W) vs Xeon E5520: Pros, Cons & Final Verdict

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

Phenom II X4 965 BE (125W)

2009

Why buy it

✅+0.1% higher PassMark.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon E5520 across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (6 MB vs 8 MB).
❌Less compelling for workstation-style loads than Xeon E5520, which brings 4 cores / 8 threads.
❌56.3% higher power demand at 125W vs 80W.

Xeon E5520

2009

Why buy it

✅Better for gaming: +7.0% higher average FPS across 50 shared CPU benchmark tests.
✅+33.3% larger total L3 cache (8 MB vs 6 MB).
✅Better for workstations and heavier parallel workloads: 4 cores / 8 threads.
✅Draws 80W instead of 125W, a 45W reduction.

Trade-offs

❌Lower PassMark (2,541 vs 2,544).

Quick Answers

So, is Xeon E5520 better than Phenom II X4 965 BE (125W)?

Not really, because they are built for different jobs. Xeon E5520 makes more sense for workstation-style multi-core throughput, while Phenom II X4 965 BE (125W) is the more practical desktop choice for gaming, platform cost, and everyday use.

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

For streaming, content creation, and heavier multitasking, Phenom II X4 965 BE (125W) is the stronger fit. You are getting 0.1% better PassMark, backed by 4 cores and 4 threads.

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

Xeon E5520 still makes the most sense overall. Xeon E5520 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 7.0% average FPS lead across 50 shared CPU game tests in our data.

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

Xeon E5520 is the safer long-term CPU choice because it gives you more room to grow and a better platform outlook.

Phenom II X4 965 BE (125W) vs Xeon E5520 Technical Specifications

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

Phenom II X4 965 BE (125W)

The Phenom II X4 965 BE (125W) is manufactured by AMD. It was released in 2009-01-01. It is based on the Deneb (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 3.4 GHz, with boost up to 3.4 GHz. L3 cache: 6 MB (total). L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 125 Watt. Memory support: DDR3. Passmark benchmark score: 2,544 points. Launch price was $149.

Xeon E5520

The Xeon E5520 is manufactured by Intel. It was released in 30 March 2009 (16 years ago). It is based on the Gainestown (2009−2010) architecture. It features 4 cores and 8 threads. Base frequency is 2.26 GHz, with boost up to 2.53 GHz. L3 cache: 8 MB (total). L2 cache: 256 kB (per core). Built on 45 nm process technology. Socket: LGA1366. Thermal design power (TDP): 80 Watt. Memory support: DDR3. Passmark benchmark score: 2,541 points. Launch price was $19.

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Processing Power

The Phenom II X4 965 BE (125W) packs 4 cores / 4 threads, matching the Xeon E5520's 4 cores. Boost clocks reach 3.4 GHz on the Phenom II X4 965 BE (125W) versus 2.53 GHz on the Xeon E5520 — a 29.3% clock advantage for the Phenom II X4 965 BE (125W) (base: 3.4 GHz vs 2.26 GHz). The Phenom II X4 965 BE (125W) uses the Deneb (2009−2011) architecture (45 nm), while the Xeon E5520 uses Gainestown (2009−2010) (45 nm). In PassMark, the Phenom II X4 965 BE (125W) scores 2,544 against the Xeon E5520's 2,541 — a 0.1% lead for the Phenom II X4 965 BE (125W). L3 cache: 6 MB (total) on the Phenom II X4 965 BE (125W) vs 8 MB (total) on the Xeon E5520.

Feature	Phenom II X4 965 BE (125W)	Xeon E5520
Cores / Threads	4 / 4	4 / 8
Boost Clock	3.4 GHz+34%	2.53 GHz
Base Clock	3.4 GHz+50%	2.26 GHz
L3 Cache	6 MB (total)	8 MB (total)+33%
L2 Cache	512 kB (per core)+100%	256 kB (per core)
Process	45 nm	45 nm
Architecture	Deneb (2009−2011)	Gainestown (2009−2010)
PassMark	2,544	2,541

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Memory & Platform

The Phenom II X4 965 BE (125W) uses the AM3 socket (PCIe 2.0), while the Xeon E5520 uses LGA1366 (PCIe 2.0) — making them incompatible on the same motherboard.