Celeron G3900 vs Xeon L5420

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.

Celeron G3900 vs Xeon L5420 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.

Celeron G3900 vs Xeon L5420: Pros, Cons & Final Verdict

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

Celeron G3900

2015

Why buy it

✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel HD Graphics 510, while Xeon L5420 needs a discrete GPU.
✅Includes a boxed cooler (Intel Stock), unlike Xeon L5420.

Trade-offs

❌Smaller total L3 cache (4 MB vs 12 MB).
❌Less compelling for workstation-style loads than Xeon L5420, which brings 4 cores / 4 threads.
❌Launch MSRP is still $42 MSRP, while Xeon L5420 mostly shows up through inconsistent older-market listings.

Xeon L5420

2008

Why buy it

✅+200% larger total L3 cache (12 MB vs 4 MB).
✅Better for workstations and heavier parallel workloads: 4 cores / 4 threads.
✅Draws 50W instead of 51W, a 1W reduction.

Trade-offs

❌Lower PassMark (2,143 vs 2,155).
❌No integrated graphics, while Celeron G3900 can still boot and troubleshoot without a discrete GPU.
❌No boxed cooler included, unlike Celeron G3900.

Quick Answers

So, is Celeron G3900 better than Xeon L5420?

Not really, because they are built for different jobs. Xeon L5420 makes more sense for workstation-style multi-core throughput, while Celeron G3900 is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Celeron G3900 is the better pick. According to our tests, it delivers 1.7% 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, Celeron G3900 is the stronger fit. You are getting 0.6% better PassMark, backed by 2 cores and 2 threads.

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

Celeron G3900 is the better buy right now. Celeron G3900 comes in at an unclear MSRP at $42 MSRP versus unclear MSRP, and it still gives you a 1.7% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (51.3 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Celeron G3900 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2008) and more multi-core headroom with 2 cores / 2 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Celeron G3900 vs Xeon L5420 Technical Specifications

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

Celeron G3900

The Celeron G3900 is manufactured by Intel. It was released in 1 September 2015 (10 years ago). It is based on the Skylake (2015−2016) architecture. It features 2 cores and 2 threads. Base frequency is 2.8 GHz, with boost up to 2.8 GHz. L3 cache: 4 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 51 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 2,155 points. Launch price was $42.

Xeon L5420

The Xeon L5420 is manufactured by Intel. It was released in 25 March 2008 (17 years ago). It is based on the Harpertown (2007−2008) architecture. It features 4 cores and 4 threads. Base frequency is 2.5 GHz, with boost up to 2.5 GHz. L3 cache: 12 MB L2 Cache. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA771. Thermal design power (TDP): 50 Watt. Memory support: DDR2, DDR3 Depends on motherboard. Passmark benchmark score: 2,143 points. Launch price was $380.

⚡

Processing Power

The Celeron G3900 packs 2 cores / 2 threads, while the Xeon L5420 offers 4 cores / 4 threads — the Xeon L5420 has 2 more cores. Boost clocks reach 2.8 GHz on the Celeron G3900 versus 2.5 GHz on the Xeon L5420 — a 11.3% clock advantage for the Celeron G3900 (base: 2.8 GHz vs 2.5 GHz). The Celeron G3900 uses the Skylake (2015−2016) architecture (14 nm), while the Xeon L5420 uses Harpertown (2007−2008) (45 nm). In PassMark, the Celeron G3900 scores 2,155 against the Xeon L5420's 2,143 — a 0.6% lead for the Celeron G3900. L3 cache: 4 MB (total) on the Celeron G3900 vs 12 MB L2 Cache on the Xeon L5420.

Feature	Celeron G3900	Xeon L5420
Cores / Threads	2 / 2	4 / 4+100%
Boost Clock	2.8 GHz+12%	2.5 GHz
Base Clock	2.8 GHz+12%	2.5 GHz
L3 Cache	4 MB (total)	12 MB L2 Cache+200%
L2 Cache	256 kB (per core)	6 MB (total)+2300%
Process	14 nm-69%	45 nm
Architecture	Skylake (2015−2016)	Harpertown (2007−2008)
PassMark	2,155	2,143
Geekbench 6 Single	680	—
Geekbench 6 Multi	1,250	—

🧠

Memory & Platform

The Celeron G3900 uses the LGA1151 socket (PCIe 3.0), while the Xeon L5420 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Celeron G3900	Xeon L5420
Socket	LGA1151	LGA771
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	DDR4-2133	—
Max RAM Capacity	64 GB	—
RAM Channels	2	—
ECC Support	Yes	—
PCIe Lanes	16	—

🔧

Advanced Features

Virtualization: VT-x, VT-d (Celeron G3900) / not specified (Xeon L5420). The Celeron G3900 includes integrated graphics (Intel HD Graphics 510), while the Xeon L5420 requires a dedicated GPU. Primary use case: Celeron G3900 targets Desktop. Direct competitor: Celeron G3900 rivals Pentium G4400.