Atom C3808 vs Xeon D-1521

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 C3808 vs Xeon D-1521 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 C3808 vs Xeon D-1521: Pros, Cons & Final Verdict

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

Atom C3808

2017

Why buy it

✅Better for gaming: +7.8% higher average FPS across 50 shared CPU benchmark tests.
✅+700% larger total L3 cache (12 MB vs 1.5 MB).
✅Draws 25W instead of 45W, a 20W reduction.
✅100+% more PCIe lanes (12 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark (5,671 vs 5,703).

Xeon D-1521

2015

Why buy it

✅+0.6% higher PassMark.

Trade-offs

❌Worse for gaming: lower average FPS than Atom C3808 across 50 shared CPU benchmark tests.
❌Smaller total L3 cache (1.5 MB vs 12 MB).
❌Launch MSRP is still $199 MSRP, while Atom C3808 mostly shows up through inconsistent older-market listings.
❌80% higher power demand at 45W vs 25W.

Quick Answers

So, is Atom C3808 better than Xeon D-1521?

Not really, because they are built for different jobs. Xeon D-1521 makes more sense for workstation-style multi-core throughput, while Atom C3808 is the more practical desktop choice for gaming, platform cost, and everyday use.

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

For streaming, content creation, and heavier multitasking, Xeon D-1521 is the stronger fit. You are getting 0.6% better PassMark, backed by 4 cores and 8 threads.

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

Atom C3808 is the easy recommendation for a fresh desktop build. Atom C3808 comes in at an unclear MSRP at unclear MSRP versus $199 MSRP, and it still gives you a 7.8% average FPS lead across 50 shared CPU game tests in our data. Xeon D-1521 only looks good on raw value math because it is a cheap legacy laptop chip, not because it is a real desktop gaming recommendation. It simply does not keep up in modern games, especially when the gap is already 7.8% in the shared gaming data.

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

Atom C3808 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2017 vs 2015) and 700% larger total L3 cache (12 MB vs 1.5 MB). That makes it the safer long-term bet.

Atom C3808 vs Xeon D-1521 Technical Specifications

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

Atom C3808

The Atom C3808 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 12 cores and 12 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 12 MB. L2 cache: 12 MB. Built on 14 nm process technology. Socket: FCBGA1310. Thermal design power (TDP): 25 Watt. Memory support: DDR4: 2133. Passmark benchmark score: 5,671 points. Launch price was $369.

Xeon D-1521

The Xeon D-1521 is manufactured by Intel. It was released in 1 November 2015 (10 years ago). It is based on the Broadwell (2015−2019) architecture. It features 4 cores and 8 threads. Base frequency is 2.4 GHz, with boost up to 2.7 GHz. L3 cache: 1.5 MB (per core). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: FCBGA1667. Thermal design power (TDP): 45 Watt. Memory support: DDR4, DDR3. Passmark benchmark score: 5,703 points. Launch price was $199.

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Processing Power

The Atom C3808 packs 12 cores / 12 threads, while the Xeon D-1521 offers 4 cores / 8 threads — the Atom C3808 has 8 more cores. Boost clocks reach 2 GHz on the Atom C3808 versus 2.7 GHz on the Xeon D-1521 — a 29.8% clock advantage for the Xeon D-1521 (base: 2 GHz vs 2.4 GHz). The Atom C3808 uses the Goldmont (2016−2017) architecture (14 nm), while the Xeon D-1521 uses Broadwell (2015−2019) (14 nm). In PassMark, the Atom C3808 scores 5,671 against the Xeon D-1521's 5,703 — a 0.6% lead for the Xeon D-1521. L3 cache: 12 MB on the Atom C3808 vs 1.5 MB (per core) on the Xeon D-1521.

Feature	Atom C3808	Xeon D-1521
Cores / Threads	12 / 12+200%	4 / 8
Boost Clock	2 GHz	2.7 GHz+35%
Base Clock	2 GHz	2.4 GHz+20%
L3 Cache	12 MB+700%	1.5 MB (per core)
L2 Cache	12 MB	256K (per core)+2033%
Process	14 nm	14 nm
Architecture	Goldmont (2016−2017)	Broadwell (2015−2019)
PassMark	5,671	5,703

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Memory & Platform

The Atom C3808 uses the FCBGA1310 socket (PCIe 3.0), while the Xeon D-1521 uses FCBGA1667 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Atom C3808	Xeon D-1521
Socket	FCBGA1310	FCBGA1667
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2133	—
Max RAM Capacity	256 GB	—
RAM Channels	2	—
ECC Support	Yes	—
PCIe Lanes	12	—