Core i5-1335U vs Xeon E5-2666 V3

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 i5-1335U vs Xeon E5-2666 V3 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 i5-1335U vs Xeon E5-2666 V3: Pros, Cons & Final Verdict

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

Core i5-1335U

2023

Why buy it

✅Better for gaming: +17.3% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 15W instead of 135W, a 120W reduction.
✅Newer platform on FCBGA1744 with DDR5 support instead of LGA2011-3 and DDR4.
✅100+% more PCIe lanes (20 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Iris Xe Graphics (80 EU), while Xeon E5-2666 V3 needs a discrete GPU.

Trade-offs

❌Smaller total L3 cache (12 MB vs 25 MB).
❌Less compelling for workstation-style loads than Xeon E5-2666 V3, which brings 10 cores / 20 threads.

Xeon E5-2666 V3

2014

Why buy it

✅+108.3% larger total L3 cache (25 MB vs 12 MB).
✅Better for workstations and heavier parallel workloads: 10 cores / 20 threads.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-1335U across 50 shared CPU benchmark tests.
❌Lower PassMark (14,044 vs 14,093).
❌800% higher power demand at 135W vs 15W.
❌Older platform position on LGA2011-3 with DDR4, while Core i5-1335U moves to FCBGA1744 and DDR5.
❌No integrated graphics, while Core i5-1335U can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i5-1335U better than Xeon E5-2666 V3?

Not really, because they are built for different jobs. Xeon E5-2666 V3 makes more sense for workstation-style multi-core throughput, while Core i5-1335U 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 i5-1335U is the better pick. According to our tests, it delivers 17.3% 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 i5-1335U is the stronger fit. You are getting 0.3% better PassMark, backed by 10 cores and 12 threads.

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

Core i5-1335U still makes the most sense overall. Core i5-1335U comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 17.3% average FPS lead across 50 shared CPU game tests in our data.

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

Core i5-1335U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2023 vs 2014), a healthier platform with FCBGA1744 and DDR5 instead of LGA2011-3, and more multi-core headroom with 10 cores / 12 threads instead of 10/20. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Core i5-1335U vs Xeon E5-2666 V3 Technical Specifications

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

Core i5-1335U

The Core i5-1335U is manufactured by Intel. It was released in 4 January 2023 (2 years ago). It is based on the Raptor Lake-U (2023) architecture. It features 10 cores and 12 threads. Base frequency is 1.3 GHz, with boost up to 4.6 GHz. L3 cache: 12 MB (total). L2 cache: 1.25 MB (per core). Built on Intel 7 nm process technology. Socket: FCBGA1744. Thermal design power (TDP): 15 Watt. Memory support: DDR5-5200, DDR4-3200, LPDDR4x-4267. Passmark benchmark score: 14,093 points. Launch price was $340.

Xeon E5-2666 V3

The Xeon E5-2666 V3 is manufactured by Intel. It was released in 2015-01-01. It is based on the Haswell-EP (2014−2015) architecture. It features 10 cores and 20 threads. Base frequency is 2.9 GHz, with boost up to 3.5 GHz. L3 cache: 25 MB (total). L2 cache: 256K (per core). Built on 22 nm process technology. Socket: LGA2011-3. Thermal design power (TDP): 135 Watt. Memory support: DDR3, DDR4 2133 MHz Quad-channel. Passmark benchmark score: 14,044 points. Launch price was $800.

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Processing Power

The Core i5-1335U packs 10 cores / 12 threads, matching the Xeon E5-2666 V3's 10 cores. Boost clocks reach 4.6 GHz on the Core i5-1335U versus 3.5 GHz on the Xeon E5-2666 V3 — a 27.2% clock advantage for the Core i5-1335U (base: 1.3 GHz vs 2.9 GHz). The Core i5-1335U uses the Raptor Lake-U (2023) architecture (Intel 7 nm), while the Xeon E5-2666 V3 uses Haswell-EP (2014−2015) (22 nm). In PassMark, the Core i5-1335U scores 14,093 against the Xeon E5-2666 V3's 14,044 — a 0.3% lead for the Core i5-1335U. L3 cache: 12 MB (total) on the Core i5-1335U vs 25 MB (total) on the Xeon E5-2666 V3.

Feature	Core i5-1335U	Xeon E5-2666 V3
Cores / Threads	10 / 12	10 / 20
Boost Clock	4.6 GHz+31%	3.5 GHz
Base Clock	1.3 GHz	2.9 GHz+123%
L3 Cache	12 MB (total)	25 MB (total)+108%
L2 Cache	1.25 MB (per core)	256K (per core)+20380%
Process	Intel 7 nm-68%	22 nm
Architecture	Raptor Lake-U (2023)	Haswell-EP (2014−2015)
PassMark	14,093	14,044
Cinebench R23 Multi	8,977	—
Geekbench 6 Single	2,389	—
Geekbench 6 Multi	9,456	—

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Memory & Platform

The Core i5-1335U uses the FCBGA1744 socket (PCIe 3.0), while the Xeon E5-2666 V3 uses LGA2011-3 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Core i5-1335U	Xeon E5-2666 V3
Socket	FCBGA1744	LGA2011-3
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	LPDDR5-6400	—
Max RAM Capacity	96 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	20	—

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Advanced Features

Virtualization: VT-x, VT-d, EPT (Core i5-1335U) / not specified (Xeon E5-2666 V3). The Core i5-1335U includes integrated graphics (Iris Xe Graphics (80 EU)), while the Xeon E5-2666 V3 requires a dedicated GPU. Primary use case: Core i5-1335U targets Productivity. Direct competitor: Core i5-1335U rivals Ryzen 5 7535U.