Core i3-4120U vs Xeon E5603

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.

Core i3-4120U vs Xeon E5603 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.

Core i3-4120U vs Xeon E5603: Pros, Cons & Final Verdict

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

Core i3-4120U

2014

Why buy it

✅Integrated graphics onboard with Intel HD Graphics 4400, while Xeon E5603 needs a discrete GPU.

Trade-offs

❌Smaller total L3 cache (3 MB vs 4 MB).
❌Less compelling for workstation-style loads than Xeon E5603, which brings 4 cores / 4 threads and 32 PCIe lanes.
❌540% higher power demand at 512W vs 80W.

Xeon E5603

2011

Why buy it

✅+33.3% larger total L3 cache (4 MB vs 3 MB).
✅Better for workstations and heavier parallel workloads: 4 cores / 4 threads, plus 32 PCIe lanes vs 12.
✅Draws 80W instead of 512W, a 432W reduction.
✅166.7% more PCIe lanes (32 vs 12) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark (1,935 vs 1,948).
❌Launch MSRP is still $188 MSRP, while Core i3-4120U mostly shows up through inconsistent older-market listings.
❌No integrated graphics, while Core i3-4120U can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i3-4120U better than Xeon E5603?

Not really, because they are built for different jobs. Xeon E5603 makes more sense for workstation-style multi-core throughput, while Core i3-4120U is the more practical desktop choice for gaming, platform cost, and everyday use.

Which one is better for gaming?

If gaming is the priority, Core i3-4120U is the better pick. According to our tests, it delivers 2.9% 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, Core i3-4120U is the stronger fit. You are getting 0.7% better PassMark, backed by 2 cores and 4 threads.

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

Core i3-4120U is still the faster CPU overall, but Xeon E5603 is easier to justify if budget matters more than peak performance. Core i3-4120U comes in at an unclear MSRP at unclear MSRP versus $188 MSRP, and it still gives you a 2.9% average FPS lead across 50 shared CPU game tests in our data. Xeon E5603 is also 100.0% better value on MSRP (10.3 vs 0.0 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Core i3-4120U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2014 vs 2011) and more multi-core headroom with 2 cores / 4 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i3-4120U vs Xeon E5603 Technical Specifications

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

Core i3-4120U

The Core i3-4120U is manufactured by Intel. It was released in 14 April 2014 (11 years ago). It is based on the Haswell (2013−2015) architecture. It features 2 cores and 4 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 3 MB. L2 cache: 512 kB. Built on 22 nm process technology. Socket: FCBGA1168. Thermal design power (TDP): 15 Watt. Memory support: DDR3. Passmark benchmark score: 1,948 points. Launch price was $281.

Xeon E5603

The Xeon E5603 is manufactured by Intel. It was released in 14 February 2011 (14 years ago). It is based on the Westmere-EP (2010−2011) architecture. It features 4 cores and 4 threads. Base frequency is 1.6 GHz, with boost up to 1.6 GHz. L3 cache: 4 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1366. Thermal design power (TDP): 80 Watt. Memory support: DDR3. Passmark benchmark score: 1,935 points. Launch price was $286.

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Processing Power

The Core i3-4120U packs 2 cores / 4 threads, while the Xeon E5603 offers 4 cores / 4 threads — the Xeon E5603 has 2 more cores. Boost clocks reach 2 GHz on the Core i3-4120U versus 1.6 GHz on the Xeon E5603 — a 22.2% clock advantage for the Core i3-4120U (base: 2 GHz vs 1.6 GHz). The Core i3-4120U uses the Haswell (2013−2015) architecture (22 nm), while the Xeon E5603 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the Core i3-4120U scores 1,948 against the Xeon E5603's 1,935 — a 0.7% lead for the Core i3-4120U. L3 cache: 3 MB on the Core i3-4120U vs 4 MB (total) on the Xeon E5603.

Feature	Core i3-4120U	Xeon E5603
Cores / Threads	2 / 4	4 / 4+100%
Boost Clock	2 GHz+25%	1.6 GHz
Base Clock	2 GHz+25%	1.6 GHz
L3 Cache	3 MB	4 MB (total)+33%
L2 Cache	512 kB+100%	256 kB (per core)
Process	22 nm-31%	32 nm
Architecture	Haswell (2013−2015)	Westmere-EP (2010−2011)
PassMark	1,948	1,935
Geekbench 6 Single	462	—
Geekbench 6 Multi	1,071	—

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Memory & Platform

The Core i3-4120U uses the FCBGA1168 socket (PCIe 3.0), while the Xeon E5603 uses LGA1366 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3L-1600 on the Core i3-4120U versus DDR3-1066 on the Xeon E5603 — the Core i3-4120U supports 50.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Xeon E5603 supports up to 288 GB of RAM compared to 16 GB — 1700% more capacity for professional workloads. Memory channels: 2 (Core i3-4120U) vs 3 (Xeon E5603). PCIe lanes: 12 (Core i3-4120U) vs 32 (Xeon E5603) — the Xeon E5603 offers 20 more lanes for additional GPUs or NVMe drives.

Feature	Core i3-4120U	Xeon E5603
Socket	FCBGA1168	LGA1366
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	DDR3L-1600+50%	DDR3-1066
Max RAM Capacity	16 GB	288 GB+1700%
RAM Channels	2	3+50%
ECC Support	No	Yes
PCIe Lanes	12	32+167%

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Advanced Features

Virtualization support: Yes (Core i3-4120U) vs VT-x, VT-d (Xeon E5603). The Core i3-4120U includes integrated graphics (Intel HD Graphics 4400), while the Xeon E5603 requires a dedicated GPU. Primary use case: Xeon E5603 targets Server.