Atom x5-Z8500 vs Core 2 Duo E6420

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 x5-Z8500 vs Core 2 Duo E6420 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 x5-Z8500 vs Core 2 Duo E6420: Pros, Cons & Final Verdict

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

Atom x5-Z8500

2015

Why buy it

✅Integrated graphics onboard with Intel HD Graphics (Cherry Trail), while Core 2 Duo E6420 needs a discrete GPU.

Trade-offs

❌No boxed cooler included, unlike Core 2 Duo E6420.

Core 2 Duo E6420

2007

Why buy it

✅700% more PCIe lanes (16 vs 2) for storage and expansion-heavy builds.
✅Includes a boxed cooler (true), unlike Atom x5-Z8500.

Trade-offs

❌Lower PassMark (1,235 vs 1,242).
❌Launch MSRP is still $183 MSRP, while Atom x5-Z8500 mostly shows up through inconsistent older-market listings.
❌No integrated graphics, while Atom x5-Z8500 can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Atom x5-Z8500 better than Core 2 Duo E6420?

Yes. Atom x5-Z8500 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, 0.6% 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 x5-Z8500 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, Atom x5-Z8500 is the stronger fit. You are getting 0.6% better PassMark, backed by 4 cores and 4 threads.

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

Atom x5-Z8500 is still the much better call for a fresh build. Atom x5-Z8500 comes in at an unclear MSRP at unclear MSRP versus $183 MSRP, and it still gives you a 0.1% average FPS lead across 50 shared CPU game tests in our data. Core 2 Duo E6420 only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2007 platform. Even with 100.0% better value on paper (6.7 vs 0.0 PassMark/$), 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?

Atom x5-Z8500 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2007) and more multi-core headroom with 4 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.

Atom x5-Z8500 vs Core 2 Duo E6420 Technical Specifications

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

Atom x5-Z8500

The Atom x5-Z8500 is manufactured by Intel. It was released in 2 March 2015 (10 years ago). It is based on the Cherry Trail (2015−2016) architecture. It features 4 cores and 4 threads. Base frequency is 1.44 GHz, with boost up to 2.24 GHz. L3 cache: 0 kB. L2 cache: 2 MB. Built on 14 nm process technology. Socket: UTFCBGA1380. Memory support: DDR3. Passmark benchmark score: 1,242 points. Launch price was $69.

Core 2 Duo E6420

The Core 2 Duo E6420 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 2.13 GHz, with boost up to 2.13 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: 1,235 points. Launch price was $249.

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Processing Power

The Atom x5-Z8500 packs 4 cores / 4 threads, while the Core 2 Duo E6420 offers 2 cores / 2 threads — the Atom x5-Z8500 has 2 more cores. Boost clocks reach 2.24 GHz on the Atom x5-Z8500 versus 2.13 GHz on the Core 2 Duo E6420 — a 5% clock advantage for the Atom x5-Z8500 (base: 1.44 GHz vs 2.13 GHz). The Atom x5-Z8500 uses the Cherry Trail (2015−2016) architecture (14 nm), while the Core 2 Duo E6420 uses Conroe (2006−2007) (65 nm). In PassMark, the Atom x5-Z8500 scores 1,242 against the Core 2 Duo E6420's 1,235 — a 0.6% lead for the Atom x5-Z8500. Both processors carry 0 kB of L3 cache.

Feature	Atom x5-Z8500	Core 2 Duo E6420
Cores / Threads	4 / 4+100%	2 / 2
Boost Clock	2.24 GHz+5%	2.13 GHz
Base Clock	1.44 GHz	2.13 GHz+48%
L3 Cache	0 kB	0 kB
L2 Cache	2 MB	4 MB+100%
Process	14 nm-78%	65 nm
Architecture	Cherry Trail (2015−2016)	Conroe (2006−2007)
PassMark	1,242	1,235

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Memory & Platform

The Atom x5-Z8500 uses the UTFCBGA1380 socket (PCIe 3.0), while the Core 2 Duo E6420 uses LGA775 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches LPDDR3-1600 on the Atom x5-Z8500 versus 1066 on the Core 2 Duo E6420 — the Atom x5-Z8500 supports 50.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core 2 Duo E6420 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. PCIe lanes: 2 (Atom x5-Z8500) vs 16 (Core 2 Duo E6420) — the Core 2 Duo E6420 offers 14 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel FC-UTBGA592 (Atom x5-Z8500) and P35,G31,G33,P45 (Core 2 Duo E6420).

Feature	Atom x5-Z8500	Core 2 Duo E6420
Socket	UTFCBGA1380	LGA775
PCIe Generation	PCIe 3.0+173%	PCIe 1.1
Max RAM Speed	LPDDR3-1600+50%	1066
Max RAM Capacity	8 GB	16 GB+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	2	16+700%

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Advanced Features

Virtualization: not specified (Atom x5-Z8500) / true (Core 2 Duo E6420). The Atom x5-Z8500 includes integrated graphics (Intel HD Graphics (Cherry Trail)), while the Core 2 Duo E6420 requires a dedicated GPU. Direct competitor: Core 2 Duo E6420 rivals Athlon 64 X2 5400+.