Pentium 4405U 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.

Pentium 4405U 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.

Pentium 4405U 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.

Pentium 4405U

2015

Why buy it

Trade-offs

❌Worse for gaming: lower average FPS than Xeon L5420 across 49 shared CPU benchmark tests.
❌Lower PassMark (2,122 vs 2,143).
❌Smaller total L3 cache (2 MB vs 12 MB).
❌Less compelling for workstation-style loads than Xeon L5420, which brings 4 cores / 4 threads.
❌924% higher power demand at 512W vs 50W.

Xeon L5420

2008

Why buy it

✅Better for gaming: +4.8% higher average FPS across 49 shared CPU benchmark tests.
✅+500% larger total L3 cache (12 MB vs 2 MB).
✅Better for workstations and heavier parallel workloads: 4 cores / 4 threads.
✅Draws 50W instead of 512W, a 462W reduction.

Trade-offs

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

Quick Answers

So, is Xeon L5420 better than Pentium 4405U?

Not really, because they are built for different jobs. Xeon L5420 makes more sense for workstation-style multi-core throughput, while Pentium 4405U is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Xeon L5420 is the better pick. According to our tests, it delivers 4.8% more average FPS across 49 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Xeon L5420 is the stronger fit. You are getting 1% better PassMark, backed by 4 cores and 4 threads. It also has the larger cache pool with 500% larger total L3 cache (12 MB vs 2 MB).

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

Xeon L5420 still makes the most sense overall. Xeon L5420 comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 4.8% average FPS lead across 49 shared CPU game tests in our data.

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

Pentium 4405U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2008). That makes it the safer long-term bet.

Pentium 4405U vs Xeon L5420 Technical Specifications

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

Pentium 4405U

The Pentium 4405U is manufactured by Intel. It was released in 1 September 2015 (10 years ago). It is based on the NetBurst (2000−2006) architecture. It features 2 cores and 4 threads. Base frequency is 2.1 GHz, with boost up to 2.1 GHz. L3 cache: 2 MB. L2 cache: 512 kB. Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 2,122 points. Launch price was $161.

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 Pentium 4405U packs 2 cores / 4 threads, while the Xeon L5420 offers 4 cores / 4 threads — the Xeon L5420 has 2 more cores. Boost clocks reach 2.1 GHz on the Pentium 4405U versus 2.5 GHz on the Xeon L5420 — a 17.4% clock advantage for the Xeon L5420 (base: 2.1 GHz vs 2.5 GHz). The Pentium 4405U uses the NetBurst (2000−2006) architecture (14 nm), while the Xeon L5420 uses Harpertown (2007−2008) (45 nm). In PassMark, the Pentium 4405U scores 2,122 against the Xeon L5420's 2,143 — a 1% lead for the Xeon L5420. L3 cache: 2 MB on the Pentium 4405U vs 12 MB L2 Cache on the Xeon L5420.

Feature	Pentium 4405U	Xeon L5420
Cores / Threads	2 / 4	4 / 4+100%
Boost Clock	2.1 GHz	2.5 GHz+19%
Base Clock	2.1 GHz	2.5 GHz+19%
L3 Cache	2 MB	12 MB L2 Cache+500%
L2 Cache	512 kB	6 MB (total)+1100%
Process	14 nm-69%	45 nm
Architecture	NetBurst (2000−2006)	Harpertown (2007−2008)
PassMark	2,122	2,143

🧠

Memory & Platform

The Pentium 4405U uses the BGA1356 socket (PCIe 3.0), while the Xeon L5420 uses LGA771 (PCIe 2.0) — making them incompatible on the same motherboard.