Atom E660 vs Pentium III 1400S

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.

Atom E660 vs Pentium III 1400S 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.

Atom E660 vs Pentium III 1400S: Pros, Cons & Final Verdict

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

Atom E660

2010

Why buy it

✅Better for gaming: +16.7% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 3W instead of 32W, a 29W reduction.
✅100+% more PCIe lanes (4 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel GMA 600, while Pentium III 1400S needs a discrete GPU.

Trade-offs

❌No boxed cooler included, unlike Pentium III 1400S.

Pentium III 1400S

2002

Why buy it

✅Includes a boxed cooler (Yes), unlike Atom E660.

Trade-offs

❌Worse for gaming: lower average FPS than Atom E660 across 50 shared CPU benchmark tests.
❌Lower PassMark (228 vs 275).
❌Launch MSRP is still $250 MSRP, while Atom E660 mostly shows up through inconsistent older-market listings.
❌966.7% higher power demand at 32W vs 3W.
❌No integrated graphics, while Atom E660 can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Atom E660 better than Pentium III 1400S?

Yes. Atom E660 is the better all-around CPU here. It gives you a 16.7% average FPS lead across 50 shared CPU game tests in our data, 20.6% 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, Atom E660 is the better pick. According to our tests, it delivers 16.7% 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, Atom E660 is the stronger fit. You are getting 20.6% better PassMark, backed by 1 cores and 2 threads.

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

Atom E660 is still the much better call for a fresh build. Atom E660 comes in at an unclear MSRP at unclear MSRP versus $250 MSRP, and it still gives you a 16.7% average FPS lead across 50 shared CPU game tests in our data. Pentium III 1400S only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2002 platform. Even with 100.0% better value on paper (0.9 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on PGA370.

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

Atom E660 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2010 vs 2002) and more multi-core headroom with 1 cores / 2 threads instead of 1/1. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Atom E660 vs Pentium III 1400S Technical Specifications

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

Atom E660

The Atom E660 is manufactured by Intel. It was released in 14 September 2010 (15 years ago). It is based on the Tunnel Creek (2010) architecture. It features 1 cores and 2 threads. Max frequency: 1.3 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: BGA676. Thermal design power (TDP): 3 Watt. Memory support: DDR2. Passmark benchmark score: 275 points. Launch price was $54.

Pentium III 1400S

The Pentium III 1400S is manufactured by Intel. It was released in 2007-01-01. It is based on the Tualatin (2000−2002) architecture. It features 1 cores and 1 threads. Max frequency: 1.4 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA370. Thermal design power (TDP): 32 Watt. Passmark benchmark score: 228 points. Launch price was $69.

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Processing Power

The Atom E660 packs 1 cores / 2 threads, matching the Pentium III 1400S's 1 cores. Boost clocks reach 1.3 GHz on the Atom E660 versus 1.4 GHz on the Pentium III 1400S — a 7.4% clock advantage for the Pentium III 1400S. The Atom E660 uses the Tunnel Creek (2010) architecture (45 nm), while the Pentium III 1400S uses Tualatin (2000−2002) (130 nm). In PassMark, the Atom E660 scores 275 against the Pentium III 1400S's 228 — a 18.7% lead for the Atom E660. Both processors carry 0 kB of L3 cache.

Feature	Atom E660	Pentium III 1400S
Cores / Threads	1 / 2	1 / 1
Boost Clock	1.3 GHz	1.4 GHz+8%
L3 Cache	0 kB	0 kB
L2 Cache	512 kB (per core)	512 kB
Process	45 nm-65%	130 nm
Architecture	Tunnel Creek (2010)	Tualatin (2000−2002)
PassMark	275+21%	228

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Memory & Platform

The Atom E660 uses the BGA676 socket (PCIe 2.0), while the Pentium III 1400S uses PGA370 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR2-800 on the Atom E660 versus PC133 on the Pentium III 1400S — the Atom E660 supports 501.5% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Pentium III 1400S supports up to 4 GB of RAM compared to 2 GB — 100% more capacity for professional workloads. Both feature 1-channel memory with ECC support. PCIe lanes: 4 (Atom E660) vs 0 (Pentium III 1400S) — the Atom E660 offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel FCBGA518 (Atom E660) and Intel 815,VIA Apollo Pro 133T (Pentium III 1400S).

Feature	Atom E660	Pentium III 1400S
Socket	BGA676	PGA370
PCIe Generation	PCIe 2.0+82%	PCIe 1.1
Max RAM Speed	DDR2-800+502%	PC133
Max RAM Capacity	2 GB	4 GB+100%
RAM Channels	1	1
ECC Support	No	Yes
PCIe Lanes	4	0

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Advanced Features

Virtualization: not specified (Atom E660) / No (Pentium III 1400S). The Atom E660 includes integrated graphics (Intel GMA 600), while the Pentium III 1400S requires a dedicated GPU.