Core i5-520UM 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 i5-520UM 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 i5-520UM 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 i5-520UM

2010

Why buy it

✅Draws 18W instead of 80W, a 62W reduction.
✅Integrated graphics onboard with Intel HD Graphics (Ironlake), 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.

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 16.
✅100% more PCIe lanes (32 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark (1,935 vs 1,943).
❌Launch MSRP is still $188 MSRP, while Core i5-520UM mostly shows up through inconsistent older-market listings.
❌344.4% higher power demand at 80W vs 18W.
❌No integrated graphics, while Core i5-520UM can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i5-520UM 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 i5-520UM 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 i5-520UM is the better pick. According to our tests, it delivers 0.1% more average FPS across 21 shared CPU game tests.

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

For streaming, content creation, and heavier multitasking, Core i5-520UM is the stronger fit. You are getting 0.4% better PassMark, backed by 2 cores and 4 threads.

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

Core i5-520UM is still the faster CPU overall, but Xeon E5603 is easier to justify if budget matters more than peak performance. Core i5-520UM comes in at an unclear MSRP at unclear MSRP versus $188 MSRP, and it still gives you a 0.1% average FPS lead across 21 shared CPU game tests in our data. Xeon E5603 is also 100.0% better value on MSRP (10.3 vs 0.0 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Xeon E5603 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2011 vs 2010) and 33.3% larger total L3 cache (4 MB vs 3 MB). That makes it the safer long-term bet.

Core i5-520UM vs Xeon E5603 Technical Specifications

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

Core i5-520UM

The Core i5-520UM is manufactured by Intel. It was released in 7 January 2010 (15 years ago). It is based on the Arrandale (2010−2011) architecture. It features 2 cores and 4 threads. Base frequency is 1.07 GHz, with boost up to 1.87 GHz. L3 cache: 3 MB. L2 cache: 512 kB. Built on 32 nm process technology. Socket: BGA1288. Thermal design power (TDP): 18 Watt. Memory support: DDR3-800. Passmark benchmark score: 1,943 points. Launch price was $241.

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 i5-520UM packs 2 cores / 4 threads, while the Xeon E5603 offers 4 cores / 4 threads — the Xeon E5603 has 2 more cores. Boost clocks reach 1.87 GHz on the Core i5-520UM versus 1.6 GHz on the Xeon E5603 — a 15.6% clock advantage for the Core i5-520UM (base: 1.07 GHz vs 1.6 GHz). The Core i5-520UM uses the Arrandale (2010−2011) architecture (32 nm), while the Xeon E5603 uses Westmere-EP (2010−2011) (32 nm). In PassMark, the Core i5-520UM scores 1,943 against the Xeon E5603's 1,935 — a 0.4% lead for the Core i5-520UM. L3 cache: 3 MB on the Core i5-520UM vs 4 MB (total) on the Xeon E5603.

Feature	Core i5-520UM	Xeon E5603
Cores / Threads	2 / 4	4 / 4+100%
Boost Clock	1.87 GHz+17%	1.6 GHz
Base Clock	1.07 GHz	1.6 GHz+50%
L3 Cache	3 MB	4 MB (total)+33%
L2 Cache	512 kB+100%	256 kB (per core)
Process	32 nm	32 nm
Architecture	Arrandale (2010−2011)	Westmere-EP (2010−2011)
PassMark	1,943	1,935

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Memory & Platform

The Core i5-520UM uses the BGA1288 socket (PCIe 2.0), while the Xeon E5603 uses LGA1366 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 800 on the Core i5-520UM versus DDR3-1066 on the Xeon E5603 — the Xeon E5603 supports 33.3% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Xeon E5603 supports up to 288 GB of RAM compared to 8 GB — 3500% more capacity for professional workloads. Memory channels: 2 (Core i5-520UM) vs 3 (Xeon E5603). PCIe lanes: 16 (Core i5-520UM) vs 32 (Xeon E5603) — the Xeon E5603 offers 16 more lanes for additional GPUs or NVMe drives.

Feature	Core i5-520UM	Xeon E5603
Socket	BGA1288	LGA1366
PCIe Generation	PCIe 2.0	PCIe 2.0
Max RAM Speed	800	DDR3-1066+33%
Max RAM Capacity	8 GB	288 GB+3500%
RAM Channels	2	3+50%
ECC Support	No	Yes
PCIe Lanes	16	32+100%

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Advanced Features

Neither processor supports overclocking. Virtualization support: true (Core i5-520UM) vs VT-x, VT-d (Xeon E5603). The Core i5-520UM includes integrated graphics (Intel HD Graphics (Ironlake)), while the Xeon E5603 requires a dedicated GPU. Primary use case: Xeon E5603 targets Server. Direct competitor: Core i5-520UM rivals Core 2 Duo SU9400.