Core i7-640UM vs Phenom X3 8400

Core i7-640UM vs Phenom X3 8400 Performance Spectrum

Core i7-640UM

2 / 4

1,168

+0.3%

1,164

0.0%

Ryzen Threadripper PRO 3955WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

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.

Core i7-640UM vs Phenom X3 8400 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 i7-640UM vs Phenom X3 8400: Pros, Cons & Final Verdict

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

Core i7-640UM

2010

Why buy it

✅+100% larger total L3 cache (4 MB vs 2 MB).
✅Draws 18W instead of 95W, a 77W reduction.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel HD Graphics (Ironlake), while Phenom X3 8400 needs a discrete GPU.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Phenom X3 8400

2008

Why buy it

Trade-offs

❌Lower PassMark (1,164 vs 1,168).
❌Smaller total L3 cache (2 MB vs 4 MB).
❌427.8% higher power demand at 95W vs 18W.
❌No integrated graphics, while Core i7-640UM can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i7-640UM better than Phenom X3 8400?

Yes. Core i7-640UM is the better all-around CPU here. It gives you a 0.5% average FPS lead across 50 shared CPU game tests in our data, 0.3% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Core i7-640UM is the better pick. According to our tests, it delivers 0.5% 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, Core i7-640UM is the stronger fit. You are getting 0.3% better PassMark, backed by 2 cores and 4 threads. It also has the larger cache pool with 100% larger total L3 cache (4 MB vs 2 MB).

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 a 0.5% average FPS lead across 50 shared CPU game tests in our data.

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), 100% larger total L3 cache (4 MB vs 2 MB), and more multi-core headroom with 2 cores / 4 threads instead of 3/3. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i7-640UM vs Phenom X3 8400 Technical Specifications

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

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.

Phenom X3 8400

The Phenom X3 8400 is manufactured by AMD. It was released in 2009-01-01. It is based on the Toliman (2008) architecture. It features 3 cores and 3 threads. Max frequency: 2.1 GHz. L3 cache: 2 MB (total). L2 cache: 512 kB (per core). Built on 65 nm process technology. Socket: AM2+. Thermal design power (TDP): 95 Watt. Passmark benchmark score: 1,164 points. Launch price was $149.

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Processing Power

The Core i7-640UM packs 2 cores / 4 threads, while the Phenom X3 8400 offers 3 cores / 3 threads — the Phenom X3 8400 has 1 more core. Boost clocks reach 2.27 GHz on the Core i7-640UM versus 2.1 GHz on the Phenom X3 8400 — a 7.8% clock advantage for the Core i7-640UM. The Core i7-640UM uses the Arrandale (2010−2011) architecture (32 nm), while the Phenom X3 8400 uses Toliman (2008) (65 nm). In PassMark, the Core i7-640UM scores 1,168 against the Phenom X3 8400's 1,164 — a 0.3% lead for the Core i7-640UM. L3 cache: 4 MB (total) on the Core i7-640UM vs 2 MB (total) on the Phenom X3 8400.

Feature	Core i7-640UM	Phenom X3 8400
Cores / Threads	2 / 4	3 / 3+50%
Boost Clock	2.27 GHz+8%	2.1 GHz
Base Clock	1.2 GHz	—
L3 Cache	4 MB (total)+100%	2 MB (total)
L2 Cache	256 kB (per core)	512 kB (per core)+100%
Process	32 nm-51%	65 nm
Architecture	Arrandale (2010−2011)	Toliman (2008)
PassMark	1,168	1,164
Geekbench 6 Single	226	—
Geekbench 6 Multi	590	—

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Memory & Platform

The Core i7-640UM uses the BGA1288 socket (PCIe 2.0), while the Phenom X3 8400 uses AM2+ (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Core i7-640UM	Phenom X3 8400
Socket	BGA1288	AM2+
PCIe Generation	PCIe 2.0	PCIe 2.0
Max RAM Speed	DDR3-1066	—
Max RAM Capacity	8 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	16	—

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Advanced Features

Virtualization: VT-x, VT-d (Core i7-640UM) / not specified (Phenom X3 8400). The Core i7-640UM includes integrated graphics (Intel HD Graphics (Ironlake)), while the Phenom X3 8400 requires a dedicated GPU. Primary use case: Core i7-640UM targets Legacy Laptop. Direct competitor: Core i7-640UM rivals Core 2 Duo SU9600.