Quick Verdict
For its time, the i7-3840QM was a mobile powerhouse offering excellent multi-threaded performance, though its soldered BGA package limits modern upgradeability.
Overview
Launch
2012
Status
End-of-lifeGeneration
3rd Generation
Market
Mobile
The Intel Core i7-3840QM is a high-end mobile processor from the Ivy Bridge generation, designed to deliver robust performance for demanding laptop users. Released in September 2012, this quad-core CPU operates at a base frequency of 2.8 GHz and can boost up to 3.8 GHz using Intel's Turbo Boost technology. With eight threads thanks to Hyper-Threading, it handles multitasking and parallel workloads efficiently. The processor is built on a 22-nanometer manufacturing process, marking a significant shrink from the previous 32nm Sandy Bridge architecture. This allowed Intel to pack 1.4 billion transistors into a 160 mm² die while maintaining a reasonable 45-watt thermal design power. Featuring 8 MB of L3 cache, the i7-3840QM ensures quick data access for demanding applications. It also integrates Intel HD Graphics 4000, providing capable everyday graphics performance without needing a discrete GPU. This specific BGA variant is soldered directly to the motherboard, making it common in thinner, high-performance laptops of its era where upgradeability was sacrificed for compact form factors.
The Core i7-3840QM combines 4 cores, 8 threads, and a 2.8 GHz base clock within a 45W envelope, making it a reliable engine for older mobile workstations and gaming laptops. Its Intel HD 4000 graphics provide basic visual capabilities, while the 8MB L3 cache ensures smooth multitasking.
Specifications
Performance
Still capable for basic office tasks and web browsing.
VT-x support makes it suitable for light VMs on the go.
Handles older or lightweight games well but struggles with modern AAA titles.
22nm was efficient for 2012, but modern 10nm/Intel 4 chips are far superior.
- •HD 4000 is not suitable for modern gaming
- •Requires discrete GPU for AAA titles
- •Fine for retro and indie games
- •No AI acceleration hardware
- •Too slow for modern AI workloads
Architecture
22nm
Process Node
Ivy Bridge
Codename
4C / 8T
Core Config
8 MB
L3 Cache
45 W
TDP
Architecture Overview
The Ivy Bridge architecture represents Intel's third generation of Core processors and the industry's first widespread adoption of 22nm tri-gate transistors. This Tri-Gate technology allowed better control of electrical current, reducing leakage and improving performance per watt. For the Core i7-3840QM, the microarchitecture retained the Sandy Bridge design but featured refinements across the board. The L3 cache was made slightly faster, and the front-side bus was optimized for lower latency. Memory support was officially upgraded to DDR3-1600, increasing memory bandwidth compared to its predecessor. Additionally, the integrated graphics were overhauled. The HD 4000 graphics doubled the execution units compared to the older HD 3000 and added support for DirectX 11. The architecture also introduced PCI Express 3.0 support, doubling the bandwidth of the bus connecting the CPU to discrete graphics and other peripherals. Despite retaining a 45W TDP, the architectural efficiency improvements made it run cooler and faster under load than the previous generation.
CPU Design
4 physical cores with Hyper-Threading for 8 threads.
Memory Subsystem
Dual-channel DDR3-1600 support.
PCIe & I/O
16 lanes of PCIe 3.0.
Overclocking
Multiplier locked, limited BCLK overclocking.
- 22nm process node
- PCIe 3.0 support
- Faster HD 4000 graphics
Key Highlights
- Excellent performance for 2012 mobile
- 22nm process improved efficiency
- 8MB L3 cache
- Hyper-Threading support
- Soldered BGA package prevents upgrades
- Lacks AVX2 instruction set
- Weak integrated graphics by modern standards
- End-of-life with no security updates
History
The Core i7-3840QM was launched on September 3, 2012, as part of Intel's strategy to refresh its mobile lineup with faster clock speeds midway through the Ivy Bridge lifecycle. It arrived alongside the Core i7-3940XM Extreme Edition, offering a premium but more affordable alternative to the flagship. During this period, Intel dominated the high-performance mobile market, facing little competition from AMD.
The i7-3840QM found its way into many high-end gaming and workstation laptops, serving as the engine for machines like the Dell XPS 15 and various MSI gaming notebooks. It represented a time when mobile CPUs were rapidly closing the performance gap with desktop counterparts. However, its BGA packaging meant it was permanently soldered, a departure from the socketed mobile CPUs of earlier years.
This shift reflected industry trends towards thinner, lighter devices with reduced modularity. Today, it is considered obsolete for modern workloads but remains a nostalgic milestone in Intel's 22nm manufacturing dominance.
Improvements over Previous Generation
- 22nm process node
- PCIe 3.0 support
- Faster HD 4000 graphics
Alternatives & Competitors
Should You Buy It?
Not Recommended for the right buyer
Repairing an existing 2012-era premium laptop.
Avoid if…
- Building a new system
- Need modern AI or AVX-512 support
- Require high-efficiency battery life
Use Cases
Interesting Facts
It was part of Intel's first 22nm processor family.
BGA packaging made it popular in ultrathin gaming laptops.
Supports VT-d for directed I/O virtualization.
HD 4000 graphics were a major leap over HD 3000.
Has a maximum turbo boost of 3.8GHz on single cores.
Features 1.4 billion transistors.
Die size is 160 mm².
Officially supports DDR3-1600 memory.
Launched alongside the 3940XM Extreme Edition.
TDP of 45W was standard for high-end mobile.
People Also Ask
What socket does the i7-3840QM use?
It uses the Intel BGA 1224 socket, meaning it is soldered.
Can I overclock the i7-3840QM?
No, the multiplier is locked, though BCLK overclocking is limited.
Does the i7-3840QM have integrated graphics?
Yes, it features Intel HD Graphics 4000.
What is the TDP of the i7-3840QM?
It has a 45-watt thermal design power.
Is the i7-3840QM good for gaming?
It can run older games, but struggles with modern titles.
How many cores does the i7-3840QM have?
It has 4 physical cores and 8 threads.
What RAM does the i7-3840QM support?
It supports DDR3 memory in dual-channel mode.
What generation is the i7-3840QM?
It is a 3rd generation Intel Core processor (Ivy Bridge).
Does the i7-3840QM support VT-d?
Yes, it supports both VT-x and VT-d virtualization.
What is the max turbo frequency?
The maximum turbo frequency is 3.8 GHz.
Frequently Asked Questions
Is the i7-3840QM unlocked?
No, only XM models in this generation are unlocked.
What is the difference between QM and XM?
QM stands for Quad-core Mobile, XM for Extreme Edition Mobile.
Can I upgrade the i7-3840QM?
No, the BGA 1224 socket is soldered and non-upgradable.
Does it support PCIe 3.0?
Yes, Ivy Bridge introduced PCIe 3.0 support.
What is the die size?
The die size is 160 mm².
How many transistors does it have?
It contains 1.4 billion transistors.
Does it support AVX?
Yes, it supports Advanced Vector Extensions (AVX).
What is the maximum memory support?
It typically supports up to 32GB of DDR3 RAM.
Is it good for video editing?
It can handle basic 1080p editing but is slow for 4K.
What is the base clock speed?
The base clock speed is 2.8 GHz.