Athlon II X4 645 vs Xeon X5450

Athlon II X4 645 vs Xeon X5450 Performance Spectrum

Athlon II X4 645

4 / 4

2,375

0.0%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Xeon X5450

4 / 4

2,416

+1.7%

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.

Athlon II X4 645 vs Xeon X5450 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.

Athlon II X4 645 vs Xeon X5450: Pros, Cons & Final Verdict

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

Athlon II X4 645

2010

Why buy it

✅Draws 95W instead of 120W, a 25W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Includes a boxed cooler (Yes), unlike Xeon X5450.

Trade-offs

❌Lower PassMark (2,375 vs 2,416).
❌Launch MSRP is still $126 MSRP, while Xeon X5450 mostly shows up through inconsistent older-market listings.

Xeon X5450

2007

Why buy it

✅+1.7% higher PassMark.

Trade-offs

❌26.3% higher power demand at 120W vs 95W.
❌No boxed cooler included, unlike Athlon II X4 645.

Quick Answers

So, is Athlon II X4 645 better than Xeon X5450?

Not really, because they are built for different jobs. Xeon X5450 makes more sense for workstation-style multi-core throughput, while Athlon II X4 645 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, Xeon X5450 is the stronger fit. You are getting 1.7% better PassMark, backed by 4 cores and 4 threads.

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

Athlon II X4 645 is the better buy right now. Athlon II X4 645 comes in at an unclear MSRP at $126 MSRP versus unclear MSRP, and it still gives you a 2.2% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Xeon X5450 is still stronger for heavier multi-core work with 1.7% better PassMark. It is also 100.0% better value on MSRP (18.8 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Athlon II X4 645 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2010 vs 2007). That makes it the safer long-term bet.

Athlon II X4 645 vs Xeon X5450 Technical Specifications

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

Athlon II X4 645

The Athlon II X4 645 is manufactured by AMD. It was released in 21 September 2010 (15 years ago). It is based on the Propus (2009−2011) architecture. It features 4 cores and 4 threads. Base frequency is 3.1 GHz, with boost up to 3.1 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 2,375 points. Launch price was $80.

Xeon X5450

The Xeon X5450 is manufactured by Intel. It was released in 11 November 2007 (18 years ago). It is based on the Harpertown (2007−2008) architecture. It features 4 cores and 4 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 12 MB L2 Cache. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA771. Thermal design power (TDP): 120 Watt. Memory support: DDR2, DDR3 Depends on motherboard. Passmark benchmark score: 2,416 points. Launch price was $851.

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Processing Power

Both the Athlon II X4 645 and Xeon X5450 share an identical 4-core/4-thread configuration. Boost clocks reach 3.1 GHz on the Athlon II X4 645 versus 3 GHz on the Xeon X5450 — a 3.3% clock advantage for the Athlon II X4 645 (base: 3.1 GHz vs 3 GHz). The Athlon II X4 645 uses the Propus (2009−2011) architecture (45 nm), while the Xeon X5450 uses Harpertown (2007−2008) (45 nm). In PassMark, the Athlon II X4 645 scores 2,375 against the Xeon X5450's 2,416 — a 1.7% lead for the Xeon X5450. L3 cache: 0 kB on the Athlon II X4 645 vs 12 MB L2 Cache on the Xeon X5450.

Feature	Athlon II X4 645	Xeon X5450
Cores / Threads	4 / 4	4 / 4
Boost Clock	3.1 GHz+3%	3 GHz
Base Clock	3.1 GHz+3%	3 GHz
L3 Cache	0 kB	12 MB L2 Cache
L2 Cache	512 kB (per core)	6 MB (total)+1100%
Process	45 nm	45 nm
Architecture	Propus (2009−2011)	Harpertown (2007−2008)
PassMark	2,375	2,416+2%
Cinebench R23 Multi	1,374	—
Geekbench 6 Single	399	—
Geekbench 6 Multi	1,374	—

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Memory & Platform

The Athlon II X4 645 uses the AM3 socket (PCIe 2.0), while the Xeon X5450 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.