Core i7-3940XM vs Core i7-8565U

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 i7-3940XM vs Core i7-8565U 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 i7-3940XM vs Core i7-8565U: Pros, Cons & Final Verdict

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

Core i7-3940XM

2012

Why buy it

✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with HD Graphics 4000, while Core i7-8565U needs a discrete GPU.

Trade-offs

❌Lower PassMark (5,957 vs 5,976).
❌266.7% higher power demand at 55W vs 15W.

Core i7-8565U

2018

Why buy it

✅Draws 15W instead of 55W, a 40W reduction.

Trade-offs

❌No integrated graphics, while Core i7-3940XM can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Core i7-8565U better than Core i7-3940XM?

Yes. Core i7-8565U is the better all-around CPU here. It gives you a 0.4% average FPS lead across 50 shared CPU game tests in our data, 0.3% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Core i7-8565U is the better pick. According to our tests, it delivers 0.4% 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 i7-8565U is the stronger fit. You are getting 0.3% better PassMark, backed by 4 cores and 8 threads.

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

Core i7-8565U still makes the most sense overall. Core i7-8565U comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 0.4% average FPS lead across 50 shared CPU game tests in our data.

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

Core i7-8565U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2018 vs 2012) and more multi-core headroom with 4 cores / 8 threads instead of 4/8. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i7-3940XM vs Core i7-8565U Technical Specifications

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

Core i7-3940XM

The Core i7-3940XM is manufactured by Intel. It was released in 3 September 2012 (13 years ago). It is based on the Ivy Bridge (2012−2013) architecture. It features 4 cores and 8 threads. Base frequency is 3 GHz, with boost up to 3.9 GHz. L3 cache: 8 MB (total). L2 cache: 256K (per core). Built on 22 nm process technology. Socket: PGA988. Thermal design power (TDP): 55 Watt. Memory support: DDR3. Passmark benchmark score: 5,957 points. Launch price was $1,096.

Core i7-8565U

The Core i7-8565U is manufactured by Intel. It was released in 1 October 2018 (7 years ago). It is based on the Whiskey Lake-U (2018−2019) architecture. It features 4 cores and 8 threads. Base frequency is 1.8 GHz, with boost up to 4.6 GHz. L3 cache: 8 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR4. Passmark benchmark score: 5,976 points. Launch price was $409.

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Processing Power

Both the Core i7-3940XM and Core i7-8565U share an identical 4-core/8-thread configuration. Boost clocks reach 3.9 GHz on the Core i7-3940XM versus 4.6 GHz on the Core i7-8565U — a 16.5% clock advantage for the Core i7-8565U (base: 3 GHz vs 1.8 GHz). The Core i7-3940XM uses the Ivy Bridge (2012−2013) architecture (22 nm), while the Core i7-8565U uses Whiskey Lake-U (2018−2019) (14 nm). In PassMark, the Core i7-3940XM scores 5,957 against the Core i7-8565U's 5,976 — a 0.3% lead for the Core i7-8565U. Both processors carry 8 MB (total) of L3 cache.

Feature	Core i7-3940XM	Core i7-8565U
Cores / Threads	4 / 8	4 / 8
Boost Clock	3.9 GHz	4.6 GHz+18%
Base Clock	3 GHz+67%	1.8 GHz
L3 Cache	8 MB (total)	8 MB (total)
L2 Cache	256K (per core)	256 kB (per core)
Process	22 nm	14 nm-36%
Architecture	Ivy Bridge (2012−2013)	Whiskey Lake-U (2018−2019)
PassMark	5,957	5,976
Geekbench 6 Single	720	—

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Memory & Platform

The Core i7-3940XM uses the PGA988 socket (PCIe 3.0), while the Core i7-8565U uses FCBGA1528 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Core i7-3940XM	Core i7-8565U
Socket	PGA988	FCBGA1528
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR3-1600	—
Max RAM Capacity	32 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	16	—

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Advanced Features

Virtualization: VT-x, VT-d, EPT (Core i7-3940XM) / not specified (Core i7-8565U). The Core i7-3940XM includes integrated graphics (HD Graphics 4000), while the Core i7-8565U requires a dedicated GPU. Primary use case: Core i7-3940XM targets Extreme Performance Laptop. Direct competitor: Core i7-3940XM rivals A10-5750M.