Atom E3815 vs Pentium 4 2.66

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 E3815 vs Pentium 4 2.66 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 E3815 vs Pentium 4 2.66: Pros, Cons & Final Verdict

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

Atom E3815

2013

Why buy it

✅100+% more PCIe lanes (4 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel HD Graphics (Bay Trail), while Pentium 4 2.66 needs a discrete GPU.

Trade-offs

❌Lower PassMark (365 vs 378).
❌365.5% higher power demand at 512W vs 110W.

Pentium 4 2.66

2002

Why buy it

✅Draws 110W instead of 512W, a 402W reduction.

Trade-offs

❌Launch MSRP is still $300 MSRP, while Atom E3815 mostly shows up through inconsistent older-market listings.
❌No integrated graphics, while Atom E3815 can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Pentium 4 2.66 better than Atom E3815?

Yes. Pentium 4 2.66 is the better all-around CPU here. It gives you 3.6% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Pentium 4 2.66 has the edge because it leads the single-thread side of this matchup with 81% higher max boost clock.

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

For streaming, content creation, and heavier multitasking, Pentium 4 2.66 is the stronger fit. You are getting 3.6% better PassMark, backed by 1 cores and 1 threads.

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

Pentium 4 2.66 is the better buy right now. Pentium 4 2.66 comes in at an unclear MSRP at $300 MSRP versus unclear MSRP, and it still gives you 3.6% higher PassMark. It is also 100.0% better value on MSRP (1.3 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Atom E3815 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2013 vs 2002). That makes it the safer long-term bet.

Atom E3815 vs Pentium 4 2.66 Technical Specifications

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

Atom E3815

The Atom E3815 is manufactured by Intel. It was released in 8 October 2013 (12 years ago). It is based on the Bay Trail-I (2013) architecture. It features 1 cores and 1 threads. Max frequency: 1.47 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 22 nm process technology. Socket: FCBGA1170. Thermal design power (TDP): 512 kB. Memory support: DDR3. Passmark benchmark score: 365 points. Launch price was $134.

Pentium 4 2.66

The Pentium 4 2.66 is manufactured by Intel. It was released in 2007-01-01. It is based on the NetBurst (2000−2006) architecture. It features 1 cores and 1 threads. Max frequency: 2.66 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA478. Thermal design power (TDP): 110 Watt. Memory support: DDR1, DDR2. Passmark benchmark score: 378 points. Launch price was $69.

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Processing Power

Both the Atom E3815 and Pentium 4 2.66 share an identical 1-core/1-thread configuration. Boost clocks reach 1.47 GHz on the Atom E3815 versus 2.66 GHz on the Pentium 4 2.66 — a 57.6% clock advantage for the Pentium 4 2.66. The Atom E3815 uses the Bay Trail-I (2013) architecture (22 nm), while the Pentium 4 2.66 uses NetBurst (2000−2006) (130 nm). In PassMark, the Atom E3815 scores 365 against the Pentium 4 2.66's 378 — a 3.5% lead for the Pentium 4 2.66. Both processors carry 0 kB of L3 cache.

Feature	Atom E3815	Pentium 4 2.66
Cores / Threads	1 / 1	1 / 1
Boost Clock	1.47 GHz	2.66 GHz+81%
L3 Cache	0 kB	0 kB
L2 Cache	512 kB (per core)	512 kB
Process	22 nm-83%	130 nm
Architecture	Bay Trail-I (2013)	NetBurst (2000−2006)
PassMark	365	378+4%

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Memory & Platform

The Atom E3815 uses the FCBGA1170 socket (PCIe 2.0), while the Pentium 4 2.66 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard.

Feature	Atom E3815	Pentium 4 2.66
Socket	FCBGA1170	PGA478
PCIe Generation	PCIe 2.0+82%	PCIe 1.1
Max RAM Speed	DDR3L-1066	—
Max RAM Capacity	8 GB	—
RAM Channels	1	—
ECC Support	Yes	—
PCIe Lanes	4	—