Quick Verdict
The fastest Clarksfield chip, offering a minor clock speed bump over the 920XM, but equally obsolete today.
Overview
Launch
Jun 20th, 2010
Status
End-of-lifeGeneration
Core i7 Extreme (Clarksfield)
Market
Mobile
The Intel Core i7-940XM is a mobile Extreme Edition processor launched in June 2010 as a minor refresh to the 920XM. Built on the 45nm Clarksfield architecture, it offered a slight frequency bump, operating at a 2.133 GHz base and boosting up to 3.333 GHz. Like its predecessor, it features 4 cores, 8 threads, and an 8 MB L3 cache. The processor retains the fully unlocked multiplier, catering to mobile enthusiasts and high-end DTR (Desktop Replacement) laptops. With a 55W TDP and 120W maximum power draw, it demanded robust thermal solutions. The 940XM was the fastest mobile processor available for a brief period before the transition to the Sandy Bridge architecture. It utilized the Socket G1 interface and supported dual-channel DDR3-1333 memory. Today, it is an End-of-Life artifact, representing the peak of Intel's early mobile quad-core efforts before efficiency became the primary design goal.
The i7-940XM was a minor refresh, pushing the Clarksfield architecture to its limits with a 2.133 GHz base and 3.333 GHz turbo.
It retained the unlocked multiplier and 55W TDP. It was the ultimate Socket G1 chip before the platform was phased out.
Specifications
Performance
Slightly faster than the 920XM but still heavily outclassed by modern CPUs.
Adequate for legacy mobile VMs but lacks modern I/O.
Handles legacy games well but bottlenecks modern GPUs and games.
Power hungry and inefficient by modern standards.
- •Highest clocks for Socket G1
- •No integrated graphics
- •Bottlenecks modern GPUs
- •No AI hardware support
- •Pure legacy x86 performance
Architecture
45nm
Process Node
Clarksfield
Codename
4C / 8T
Core Config
8 MB
L3 Cache
55 W
TDP
Architecture Overview
The Core i7-940XM utilizes the same Clarksfield die as the 920XM, representing the highest bin of Intel's 45nm Nehalem mobile architecture. The architecture integrates a dual-channel DDR3 memory controller and 16 PCIe 2.0 lanes directly onto the 296 mm² die. With 774 million transistors, the 940XM manages 4 cores and 8 threads via Hyper-Threading. The key difference in the 940XM is refined binning, allowing stable operation at 2.133 GHz natively and 3.333 GHz via Turbo Boost 1.0. Despite the higher clocks, it maintains the 55W TDP and 120W max power draw. The lack of an integrated GPU means it must be paired with a discrete GPU via the CPU's PCIe lanes. The unlocked multiplier allows enthusiasts to push beyond the 3.333 GHz turbo limit, provided the laptop's cooling solution can handle the 120W+ thermal load. It was a brute-force approach to mobile performance.
CPU Design
Highest bin of the 45nm Clarksfield die, 4 cores / 8 threads.
Memory Subsystem
Dual-channel DDR3-1333 controller.
PCIe & I/O
16 PCIe 2.0 lanes for discrete graphics.
Overclocking
Fully unlocked for Extreme Edition tuning.
- Higher base clock (2.133 GHz)
- Higher turbo clock (3.333 GHz)
- Better silicon binning
Key Highlights
- Fastest Socket G1 CPU
- Unlocked multiplier
- High turbo clock
- 8MB L3 cache
- Extremely power hungry
- No integrated graphics
- Obsolete platform
- Produces excessive heat
History
The Core i7-940XM launched in June 2010 as the ultimate expression of Intel's Clarksfield architecture. It was a minor refresh designed to maintain performance leadership while waiting for the Sandy Bridge transition. By binning the 45nm die for higher frequencies, Intel achieved 2.
133 GHz base and 3.333 GHz turbo speeds. However, the 55W TDP and lack of an integrated GPU meant it was solely for thick, expensive DTR laptops.
It marked the end of an era where mobile Extreme Edition chips were essentially repackaged desktop silicon. The 940XM held the mobile performance crown for roughly 7 months before Intel's 32nm Sandy Bridge architecture dramatically redefined mobile efficiency and integrated graphics. Today, the 940XM is remembered as the peak of brute-force mobile computing, a power-hungry beast that paved the way for more refined enthusiast laptops.
Improvements over Previous Generation
- Higher base clock (2.133 GHz)
- Higher turbo clock (3.333 GHz)
- Better silicon binning
Alternatives & Competitors
Should You Buy It?
Not Recommended for the right buyer
Upgrading an existing high-end 2010 DTR laptop.
Avoid if…
- Buying a new laptop
- Need battery life
- Running modern software
Use Cases
Interesting Facts
It was the last 45nm mobile Extreme Edition CPU.
The 940XM launched at the same $1,096 price as the 920XM.
It was quickly overshadowed by the 32nm Sandy Bridge architecture in 2011.
Only a few heavy DTR laptops could properly cool this chip.
People Also Ask
Is the Core i7-940XM better than the 920XM?
Yes, it has slightly higher base and turbo clock speeds.
Can I overclock the i7-940XM?
Yes, it features an unlocked multiplier.
What socket does the i7-940XM use?
It uses Intel Socket G1.
Does the i7-940XM have integrated graphics?
No, it requires a discrete GPU.
What is the TDP of the i7-940XM?
The TDP is 55W, with a maximum power draw of 120W.
When was the i7-940XM released?
It was released on June 20th, 2010.
How many cores does the i7-940XM have?
It has 4 cores and 8 threads.
What memory does the i7-940XM support?
It supports dual-channel DDR3-1333.
Is the i7-940XM good for modern gaming?
No, it is obsolete and lacks modern instruction sets.
What is the max turbo frequency of the i7-940XM?
The max turbo is 3.333 GHz.
Frequently Asked Questions
Does the Core i7-940XM support Hyper-Threading?
Yes, it supports 8 threads.
What is the L3 cache size of the i7-940XM?
It has 8 MB of shared L3 cache.
What manufacturing process is used for the i7-940XM?
It is built on a 45nm process.
Does the i7-940XM support Virtualization?
Yes, it supports VT-x and VT-d.
What is the base clock speed of the i7-940XM?
The base clock is 2.133 GHz.
What is the Tj_max for the i7-940XM?
The maximum junction temperature is 100°C.
Can I upgrade my laptop from i7-920XM to i7-940XM?
Usually yes, if the BIOS supports it, but performance gain is minimal.
Does the i7-940XM have PCIe 3.0?
No, it supports PCIe 2.0.
What chipsets are compatible with the i7-940XM?
PM55, HM55, QM57, and HM57 chipsets.
Is the i7-940XM still manufactured?
No, it is End-of-life.