Phenom II X3 B75 vs Xeon L5408

Phenom II X3 B75 vs Xeon L5408 Performance Spectrum

Phenom II X3 B75

3 / 3

1,783

+0.8%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Xeon L5408

4 / 4

1,769

0.0%

Pentium Dual-Core E2200

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 X3 B75 vs Xeon L5408 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 X3 B75 vs Xeon L5408: 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 X3 B75

2009

Why buy it

Trade-offs

❌Less compelling for workstation-style loads than Xeon L5408, which brings 4 cores / 4 threads.
❌137.5% higher power demand at 95W vs 40W.

Xeon L5408

2008

Why buy it

✅Better for workstations and heavier parallel workloads: 4 cores / 4 threads.
✅Draws 40W instead of 95W, a 55W reduction.

Trade-offs

❌Lower PassMark (1,769 vs 1,783).

Quick Answers

So, is Phenom II X3 B75 better than Xeon L5408?

Not really, because they are built for different jobs. Xeon L5408 makes more sense for workstation-style multi-core throughput, while Phenom II X3 B75 is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Phenom II X3 B75 is the better pick. According to our tests, it delivers 1.4% 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, Phenom II X3 B75 is the stronger fit. You are getting 0.8% better PassMark, backed by 3 cores and 3 threads.

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

Phenom II X3 B75 still makes the most sense overall. Phenom II X3 B75 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 1.4% average FPS lead across 49 shared CPU game tests in our data.

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

Phenom II X3 B75 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2009 vs 2008) and more multi-core headroom with 3 cores / 3 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Phenom II X3 B75 vs Xeon L5408 Technical Specifications

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

Phenom II X3 B75

The Phenom II X3 B75 is manufactured by AMD. It was released in 2009-01-01. It is based on the Heka (2009−2010) architecture. It features 3 cores and 3 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 6 MB (total). 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: 1,783 points. Launch price was $149.

Xeon L5408

The Xeon L5408 is manufactured by Intel. It was released in 2015-01-01. It is based on the Harpertown (2007−2008) architecture. It features 4 cores and 4 threads. Base frequency is 2.133 GHz, with boost up to 0.13 GHz. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA771. Thermal design power (TDP): 40 Watt. Memory support: DDR2, DDR3 Depends on motherboard. Passmark benchmark score: 1,769 points. Launch price was $800.

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Processing Power

The Phenom II X3 B75 packs 3 cores / 3 threads, while the Xeon L5408 offers 4 cores / 4 threads — the Xeon L5408 has 1 more core. Boost clocks reach 3 GHz on the Phenom II X3 B75 versus 0.13 GHz on the Xeon L5408 — a 183.4% clock advantage for the Phenom II X3 B75 (base: 3 GHz vs 2.133 GHz). The Phenom II X3 B75 uses the Heka (2009−2010) architecture (45 nm), while the Xeon L5408 uses Harpertown (2007−2008) (45 nm). In PassMark, the Phenom II X3 B75 scores 1,783 against the Xeon L5408's 1,769 — a 0.8% lead for the Phenom II X3 B75.

Feature	Phenom II X3 B75	Xeon L5408
Cores / Threads	3 / 3	4 / 4+33%
Boost Clock	3 GHz+2208%	0.13 GHz
Base Clock	3 GHz+41%	2.133 GHz
L3 Cache	6 MB (total)	—
L2 Cache	512 kB (per core)	6 MB (total)+1100%
Process	45 nm	45 nm
Architecture	Heka (2009−2010)	Harpertown (2007−2008)
PassMark	1,783	1,769

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Memory & Platform

The Phenom II X3 B75 uses the AM3 socket (PCIe 2.0), while the Xeon L5408 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.