Core 2 Duo E8400 vs Core i7-640UM

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 E8400 vs Core i7-640UM 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 E8400 vs Core i7-640UM: 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 E8400

2008

Why buy it

✅Includes a boxed cooler (true), unlike Core i7-640UM.

Trade-offs

❌Lower PassMark (1,165 vs 1,168).
❌261.1% higher power demand at 65W vs 18W.
❌No integrated graphics, while Core i7-640UM can still boot and troubleshoot without a discrete GPU.

Core i7-640UM

2010

Why buy it

✅+0.3% higher PassMark.
✅Draws 18W instead of 65W, a 47W reduction.
✅Integrated graphics onboard with Intel HD Graphics (Ironlake), while Core 2 Duo E8400 needs a discrete GPU.

Trade-offs

❌No boxed cooler included, unlike Core 2 Duo E8400.

Quick Answers

So, is Core i7-640UM better than Core 2 Duo E8400?

It depends on what you want from the system. For gaming, Core 2 Duo E8400 is ahead with a 2.4% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i7-640UM pulls ahead with 0.3% better PassMark.

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

For streaming, content creation, and heavier multitasking, Core i7-640UM is the stronger fit. You are getting 0.3% better PassMark, backed by 2 cores and 4 threads.

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

Core i7-640UM still makes the most sense overall. Core i7-640UM comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you 0.3% better PassMark.

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

Core i7-640UM makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2010 vs 2008) and more multi-core headroom with 2 cores / 4 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core 2 Duo E8400 vs Core i7-640UM Technical Specifications

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

Core 2 Duo E8400

The Core 2 Duo E8400 is manufactured by Intel. It was released in 2008-01-01. It is based on the Wolfdale (2008−2010) architecture. It features 2 cores and 2 threads. Base frequency is 3 GHz, with boost up to 3 GHz. L3 cache: 0 kB. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA775. Thermal design power (TDP): 65 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 1,165 points. Launch price was $249.

Core i7-640UM

The Core i7-640UM is manufactured by Intel. It was released in 7 January 2010 (15 years ago). It is based on the Arrandale (2010−2011) architecture. It features 2 cores and 4 threads. Base frequency is 1.2 GHz, with boost up to 2.27 GHz. L3 cache: 4 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: BGA1288. Thermal design power (TDP): 18 Watt. Memory support: DDR3-800. Passmark benchmark score: 1,168 points. Launch price was $305.

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Processing Power

The Core 2 Duo E8400 packs 2 cores / 2 threads, matching the Core i7-640UM's 2 cores. Boost clocks reach 3 GHz on the Core 2 Duo E8400 versus 2.27 GHz on the Core i7-640UM — a 27.7% clock advantage for the Core 2 Duo E8400 (base: 3 GHz vs 1.2 GHz). The Core 2 Duo E8400 uses the Wolfdale (2008−2010) architecture (45 nm), while the Core i7-640UM uses Arrandale (2010−2011) (32 nm). In PassMark, the Core 2 Duo E8400 scores 1,165 against the Core i7-640UM's 1,168 — a 0.3% lead for the Core i7-640UM. L3 cache: 0 kB on the Core 2 Duo E8400 vs 4 MB (total) on the Core i7-640UM.

Feature	Core 2 Duo E8400	Core i7-640UM
Cores / Threads	2 / 2	2 / 4
Boost Clock	3 GHz+32%	2.27 GHz
Base Clock	3 GHz+150%	1.2 GHz
L3 Cache	0 kB	4 MB (total)
L2 Cache	6 MB (total)+2300%	256 kB (per core)
Process	45 nm	32 nm-29%
Architecture	Wolfdale (2008−2010)	Arrandale (2010−2011)
PassMark	1,165	1,168
Geekbench 6 Single	—	226
Geekbench 6 Multi	—	590

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Memory & Platform

The Core 2 Duo E8400 uses the LGA775 socket (PCIe 1.1), while the Core i7-640UM uses BGA1288 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 1333 on the Core 2 Duo E8400 versus DDR3-1066 on the Core i7-640UM — the Core 2 Duo E8400 supports 25% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core 2 Duo E8400 supports up to 16 GB of RAM compared to 8 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: P35,G31,G33,P45 (Core 2 Duo E8400) and HM55,QM57 (Core i7-640UM).

Feature	Core 2 Duo E8400	Core i7-640UM
Socket	LGA775	BGA1288
PCIe Generation	PCIe 1.1	PCIe 2.0+82%
Max RAM Speed	1333+25%	DDR3-1066
Max RAM Capacity	16 GB+100%	8 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	16

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Advanced Features

Neither processor supports overclocking. Virtualization support: true (Core 2 Duo E8400) vs VT-x, VT-d (Core i7-640UM). The Core i7-640UM includes integrated graphics (Intel HD Graphics (Ironlake)), while the Core 2 Duo E8400 requires a dedicated GPU. Primary use case: Core i7-640UM targets Legacy Laptop. Direct competitor: Core 2 Duo E8400 rivals Phenom II X2 550; Core i7-640UM rivals Core 2 Duo SU9600.