Core 2 Duo E6550 vs Pentium D 820

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.

Core 2 Duo E6550 vs Pentium D 820 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.

Core 2 Duo E6550 vs Pentium D 820: Pros, Cons & Final Verdict

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

Core 2 Duo E6550

2007

Why buy it

✅Costs $78 less on MSRP ($163 MSRP vs $241 MSRP).
✅Delivers 46.1% more PassMark for each dollar spent, at 8.6 vs 5.9 PassMark/$ ($163 MSRP vs $241 MSRP).
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Includes a boxed cooler (true), unlike Pentium D 820.

Trade-offs

❌Lower PassMark (1,395 vs 1,412).
❌3150% higher power demand at 65W vs 2W.

Pentium D 820

2005

Why buy it

✅Draws 2W instead of 65W, a 63W reduction.

Trade-offs

❌Lower PassMark per dollar, at 5.9 vs 8.6 PassMark/$ ($241 MSRP vs $163 MSRP).
❌No boxed cooler included, unlike Core 2 Duo E6550.

Quick Answers

So, is Pentium D 820 better than Core 2 Duo E6550?

Yes. Pentium D 820 is the better all-around CPU here. It gives you a 0.1% average FPS lead across 50 shared CPU game tests in our data and 1.2% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Pentium D 820 is the better pick. According to our tests, it delivers 0.1% more average FPS across 50 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Pentium D 820 is the stronger fit. You are getting 1.2% better PassMark, backed by 2 cores and 2 threads.

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

Pentium D 820 is still the much better call for a fresh build. Pentium D 820 comes in 47.9% more expensive on MSRP at $241 MSRP versus $163 MSRP, and it still gives you a 0.1% average FPS lead across 50 shared CPU game tests in our data. Core 2 Duo E6550 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2007 platform. Even with 46.1% better value on paper (8.6 vs 5.9 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on LGA775.

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

Core 2 Duo E6550 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2007 vs 2005). That makes it the safer long-term bet.

Core 2 Duo E6550 vs Pentium D 820 Technical Specifications

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

Core 2 Duo E6550

The Core 2 Duo E6550 is manufactured by Intel. It was released in 2008-01-01. It is based on the Conroe (2006−2007) architecture. It features 2 cores and 2 threads. Base frequency is 2.33 GHz, with boost up to 2.33 GHz. L3 cache: 0 kB. L2 cache: 4 MB. Built on 65 nm process technology. Socket: LGA775. Thermal design power (TDP): 65 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 1,395 points. Launch price was $249.

Pentium D 820

The Pentium D 820 is manufactured by Intel. It was released in 2007-01-01. It is based on the NetBurst (2000−2006) architecture. It features 2 cores and 2 threads. Base frequency is 2.8 GHz, with boost up to 2.8 GHz. L3 cache: 0 kB. L2 cache: 2 MB. Built on 90 nm process technology. Socket: LGA775. Thermal design power (TDP): 95 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 1,412 points. Launch price was $69.

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Processing Power

Both the Core 2 Duo E6550 and Pentium D 820 share an identical 2-core/2-thread configuration. Boost clocks reach 2.33 GHz on the Core 2 Duo E6550 versus 2.8 GHz on the Pentium D 820 — a 18.3% clock advantage for the Pentium D 820 (base: 2.33 GHz vs 2.8 GHz). The Core 2 Duo E6550 uses the Conroe (2006−2007) architecture (65 nm), while the Pentium D 820 uses NetBurst (2000−2006) (90 nm). In PassMark, the Core 2 Duo E6550 scores 1,395 against the Pentium D 820's 1,412 — a 1.2% lead for the Pentium D 820. Both processors carry 0 kB of L3 cache.

Feature	Core 2 Duo E6550	Pentium D 820
Cores / Threads	2 / 2	2 / 2
Boost Clock	2.33 GHz	2.8 GHz+20%
Base Clock	2.33 GHz	2.8 GHz+20%
L3 Cache	0 kB	0 kB
L2 Cache	4 MB+100%	2 MB
Process	65 nm-28%	90 nm
Architecture	Conroe (2006−2007)	NetBurst (2000−2006)
PassMark	1,395	1,412+1%
Geekbench 6 Single	—	166

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Memory & Platform

Both processors use the LGA775 socket with PCIe 1.1. Maximum memory speed reaches 1333 on the Core 2 Duo E6550 versus DDR2-667 on the Pentium D 820 — the Core 2 Duo E6550 supports 99.9% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core 2 Duo E6550 supports up to 16 GB of RAM compared to 4 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core 2 Duo E6550) vs 0 (Pentium D 820) — the Core 2 Duo E6550 offers 16 more lanes for additional GPUs or NVMe drives. Chipset compatibility: P35,G31,G33,P45 (Core 2 Duo E6550) and Intel 945,Intel 955 (Pentium D 820).

Feature	Core 2 Duo E6550	Pentium D 820
Socket	LGA775	LGA775
PCIe Generation	PCIe 1.1	PCIe 1.1
Max RAM Speed	1333+100%	DDR2-667
Max RAM Capacity	16 GB+300%	4 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	0

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Advanced Features

Virtualization support: true (Core 2 Duo E6550) vs No (Pentium D 820). Direct competitor: Core 2 Duo E6550 rivals Athlon 64 X2 6000+.

Feature	Core 2 Duo E6550	Pentium D 820
Integrated GPU	No	No
IGPU Model	None	—
Unlocked	No	—
AVX-512	No	No
Virtualization	true	No

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Value Analysis

At launch, the Core 2 Duo E6550 was priced at $163, while the Pentium D 820 came in at $241. On launch pricing ($163 vs $241), Core 2 Duo E6550 was $78 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core 2 Duo E6550 delivers 8.6 pts/$ vs 5.9 pts/$ for the Pentium D 820 — making the Core 2 Duo E6550 the 37.4% better value option.

Feature	Core 2 Duo E6550	Pentium D 820
MSRP	$163-32%	$241
Performance per Dollar	8.6+46%	5.9
Release Date	2007	2005

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