Atom C3955 vs Xeon E3-1225 v6

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 C3955 vs Xeon E3-1225 v6 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 C3955 vs Xeon E3-1225 v6: Pros, Cons & Final Verdict

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

Atom C3955

2017

Why buy it

✅Better for gaming: +29.4% higher average FPS across 50 shared CPU benchmark tests.
✅+100% larger total L3 cache (16 MB vs 8 MB).
✅Draws 32W instead of 73W, a 41W reduction.
✅100+% more PCIe lanes (12 vs 0) for storage and expansion-heavy builds.

Trade-offs

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

Xeon E3-1225 v6

2017

Why buy it

Trade-offs

❌Worse for gaming: lower average FPS than Atom C3955 across 50 shared CPU benchmark tests.
❌Lower PassMark (5,740 vs 5,803).
❌Smaller total L3 cache (8 MB vs 16 MB).
❌128.1% higher power demand at 73W vs 32W.

Quick Answers

So, is Atom C3955 better than Xeon E3-1225 v6?

Not really, because they are built for different jobs. Xeon E3-1225 v6 makes more sense for workstation-style multi-core throughput, while Atom C3955 is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Atom C3955 is the better pick. According to our tests, it delivers 29.4% 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 C3955 is the stronger fit. You are getting 1.1% better PassMark, backed by 16 cores and 16 threads. It also has the larger cache pool with 100% larger total L3 cache (16 MB vs 8 MB).

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

Atom C3955 still makes the most sense overall. Atom C3955 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 29.4% average FPS lead across 50 shared CPU game tests in our data.

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

Atom C3955 makes more sense long term for 2026 and beyond. You are getting 100% larger total L3 cache (16 MB vs 8 MB) and more multi-core headroom with 16 cores / 16 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Atom C3955 vs Xeon E3-1225 v6 Technical Specifications

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

Atom C3955

The Atom C3955 is manufactured by Intel. It was released in 15 August 2017 (8 years ago). It is based on the Goldmont (2016−2017) architecture. It features 16 cores and 16 threads. Base frequency is 2.1 GHz, with boost up to 2.4 GHz. L3 cache: 16 MB. L2 cache: 16 MB. Built on 14 nm process technology. Socket: FCBGA1310. Thermal design power (TDP): 32 Watt. Memory support: DDR4: 2400. Passmark benchmark score: 5,803 points. Launch price was $434.

Xeon E3-1225 v6

The Xeon E3-1225 v6 is manufactured by Intel. It was released in 28 March 2017 (8 years ago). It is based on the Kaby Lake (2016−2019) architecture. It features 4 cores and 4 threads. Base frequency is 3.3 GHz, with boost up to 3.7 GHz. L3 cache: 8 MB. L2 cache: 1 MB. Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 73 Watt. Memory support: DDR4-2400, DDR3L-1866. Passmark benchmark score: 5,740 points. Launch price was $213.

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Processing Power

The Atom C3955 packs 16 cores / 16 threads, while the Xeon E3-1225 v6 offers 4 cores / 4 threads — the Atom C3955 has 12 more cores. Boost clocks reach 2.4 GHz on the Atom C3955 versus 3.7 GHz on the Xeon E3-1225 v6 — a 42.6% clock advantage for the Xeon E3-1225 v6 (base: 2.1 GHz vs 3.3 GHz). The Atom C3955 uses the Goldmont (2016−2017) architecture (14 nm), while the Xeon E3-1225 v6 uses Kaby Lake (2016−2019) (14 nm). In PassMark, the Atom C3955 scores 5,803 against the Xeon E3-1225 v6's 5,740 — a 1.1% lead for the Atom C3955. L3 cache: 16 MB on the Atom C3955 vs 8 MB on the Xeon E3-1225 v6.

Feature	Atom C3955	Xeon E3-1225 v6
Cores / Threads	16 / 16+300%	4 / 4
Boost Clock	2.4 GHz	3.7 GHz+54%
Base Clock	2.1 GHz	3.3 GHz+57%
L3 Cache	16 MB+100%	8 MB
L2 Cache	16 MB+1500%	1 MB
Process	14 nm	14 nm
Architecture	Goldmont (2016−2017)	Kaby Lake (2016−2019)
PassMark	5,803+1%	5,740

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Memory & Platform

The Atom C3955 uses the FCBGA1310 socket (PCIe 3.0), while the Xeon E3-1225 v6 uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Atom C3955	Xeon E3-1225 v6
Socket	FCBGA1310	LGA1151
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2400	—
Max RAM Capacity	256 GB	—
RAM Channels	2	—
ECC Support	Yes	—
PCIe Lanes	12	—