Phenom II X6 1055T (95W) vs Xeon E5645

Phenom II X6 1055T (95W) vs Xeon E5645 Performance Spectrum

Phenom II X6 1055T (95W)

6 / 6

4,965

+0.5%

Ryzen Threadripper PRO 7965WX

Xeon E5645

6 / 12

4,942

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 X6 1055T (95W) vs Xeon E5645 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 X6 1055T (95W) vs Xeon E5645: 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 X6 1055T (95W)

2010

Why buy it

✅+0.5% higher PassMark.

Trade-offs

❌Worse for gaming: lower average FPS than Xeon E5645 across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (6 MB vs 12 MB).
❌Less compelling for workstation-style loads than Xeon E5645, which brings 6 cores / 12 threads.
❌18.8% higher power demand at 95W vs 80W.

Xeon E5645

2010

Why buy it

✅Better for gaming: +21.3% higher average FPS across 50 shared CPU benchmark tests.
✅+100% larger total L3 cache (12 MB vs 6 MB).
✅Better for workstations and heavier parallel workloads: 6 cores / 12 threads.
✅Draws 80W instead of 95W, a 15W reduction.

Trade-offs

❌Lower PassMark (4,942 vs 4,965).
❌Launch MSRP is still $294 MSRP, while Phenom II X6 1055T (95W) mostly shows up through inconsistent older-market listings.

Quick Answers

So, is Xeon E5645 better than Phenom II X6 1055T (95W)?

Not really, because they are built for different jobs. Xeon E5645 makes more sense for workstation-style multi-core throughput, while Phenom II X6 1055T (95W) 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 X6 1055T (95W) is the stronger fit. You are getting 0.5% better PassMark, backed by 6 cores and 6 threads.

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

Xeon E5645 is the better buy right now. Xeon E5645 comes in at an unclear MSRP at $294 MSRP versus unclear MSRP, and it still gives you a 21.3% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Phenom II X6 1055T (95W) is still stronger for heavier multi-core work with 0.5% better PassMark. It is also 100.0% better value on MSRP (16.8 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Xeon E5645 is the safer long-term CPU choice because it gives you more room to grow and a better platform outlook.

Phenom II X6 1055T (95W) vs Xeon E5645 Technical Specifications

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

Phenom II X6 1055T (95W)

The Phenom II X6 1055T (95W) is manufactured by AMD. It was released in 2009-01-01. It is based on the Thuban (2010) architecture. It features 6 cores and 6 threads. Base frequency is 2.8 GHz, with boost up to 3.3 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: 4,965 points. Launch price was $149.

Xeon E5645

The Xeon E5645 is manufactured by Intel. It was released in 16 March 2010 (15 years ago). It is based on the Westmere-EP (2010−2011) architecture. It features 6 cores and 12 threads. Base frequency is 2.4 GHz, with boost up to 2.67 GHz. L3 cache: 12 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 80 Watt. Memory support: DDR3. Passmark benchmark score: 4,942 points. Launch price was $294.

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Processing Power

The Phenom II X6 1055T (95W) packs 6 cores / 6 threads, matching the Xeon E5645's 6 cores. Boost clocks reach 3.3 GHz on the Phenom II X6 1055T (95W) versus 2.67 GHz on the Xeon E5645 — a 21.1% clock advantage for the Phenom II X6 1055T (95W) (base: 2.8 GHz vs 2.4 GHz). The Phenom II X6 1055T (95W) uses the Thuban (2010) architecture (45 nm), while the Xeon E5645 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the Phenom II X6 1055T (95W) scores 4,965 against the Xeon E5645's 4,942 — a 0.5% lead for the Phenom II X6 1055T (95W). L3 cache: 6 MB (total) on the Phenom II X6 1055T (95W) vs 12 MB (total) on the Xeon E5645.

Feature	Phenom II X6 1055T (95W)	Xeon E5645
Cores / Threads	6 / 6	6 / 12
Boost Clock	3.3 GHz+24%	2.67 GHz
Base Clock	2.8 GHz+17%	2.4 GHz
L3 Cache	6 MB (total)	12 MB (total)+100%
L2 Cache	512 kB (per core)+100%	256 kB (per core)
Process	45 nm	32 nm-29%
Architecture	Thuban (2010)	Westmere-EP (2010−2011)
PassMark	4,965	4,942

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Memory & Platform

The Phenom II X6 1055T (95W) uses the AM3 socket (PCIe 2.0), while the Xeon E5645 uses LGA1366 (PCIe 5.0) — making them incompatible on the same motherboard.