CPU Comparison
Intel Core i7-940 vs Intel Core i7-975
A side-by-side comparison of specs, performance and value. The Intel Core i7-940 launched alongside the i7-920 in November 2008 as the step-up model in the inaugural Bloomfield lineup. Operating at a base clock of 2.93GHz with a turbo boost of 3.2GHz, it offered slightly higher out-of-the-box performance than the 920. It featured the same four-core, eight-thread configuration and 8MB of L3 cache. While it was a capable processor, it occupied an awkward middle ground. Its price was significantly higher than the 920, yet it didn't offer the unlocked multiplier of the Extreme Edition 965. This positioning made it a relatively rare sight in enthusiast builds, as most users either opted for the value of the 920 or waited for later refreshes. Nevertheless, it remains a part of the foundational Nehalem architecture that reintroduced Hyper-Threading and integrated memory controllers, setting the stage for Intel's dominance in the high-end desktop market for the next decade.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Slow by modern standards.
8 threads help, but low IPC limits modern apps.
Gaming
Similar to the 920, bottlenecks modern games.
Best single-core of the Bloomfields, but still bottlenecks modern games.
Virtualization
Adequate for basic legacy VMs.
Good for basic VMs and legacy server setups.
Efficiency
130W TDP is highly inefficient.
130W TDP is highly inefficient, though slightly better than 965.
Specialized Performance
AI / ML
- Incompatible with modern AI workloads
- Incompatible with modern AI workloads
Content Creation
Gaming
- Low IPC
- No AVX2
- Bottlenecks modern GPUs
- Low IPC
- No AVX2
- Bottlenecks modern GPUs
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- High stock clock speed
- Hyper-Threading for 8 threads
- Triple-channel memory support
- Part of the foundational Nehalem architecture
- Good multi-threaded performance for its era
Cons
- Poor value at launch
- High 130W TDP
- Locked CPU multiplier
- Obsolete platform
- Lacks modern instruction sets
Pros
- Highest stock clocks for Bloomfield
- Fully unlocked multiplier
- Improved D0 stepping for better thermals
- Hyper-Threading for 8 threads
- Triple-channel memory support
Cons
- Extremely high launch price ($999)
- High 130W TDP
- Obsolete platform
- Lacks modern instruction sets
- Poor value today
Competitors & Alternatives
Intel Core i7-940
- AMD Phenom II X4 940Rival
Desktop
- Compare head-to-headIntel Core i7-920Rival
Desktop
- Intel Core 2 Extreme QX9770Rival
Desktop
- RivalCompare head-to-head
- AMD Phenom II X4 955Rival
Desktop
A better value successor that replaced the 940.
Compare head-to-head- Intel Xeon W3540Alt
Server equivalent often available for less.
- AMD Ryzen 5 3600Alt
A modern budget CPU that vastly outperforms it.
A modern budget CPU that destroys it.
Compare head-to-head
Intel Core i7-975
- RivalCompare head-to-head
- AMD Phenom II X4 965Rival
Desktop
- Compare head-to-headIntel Core i7-960Rival
Desktop
- Intel Core 2 Extreme QX9770Rival
HEDT
- AMD Phenom II X6 1090TRival
Desktop
- Intel Xeon W3580Alt
Server equivalent often available for less.
- AMD Ryzen 5 3600Alt
A modern budget CPU that vastly outperforms it.
- Intel Core i5-12400FAlt
A modern budget CPU that obliterates it.
Our Verdict on Each
A capable but poor-value CPU at launch due to the 920's overclocking prowess. Today, it's a rare collector's item.
Best for: Completing a period-accurate 2008 retro build.
Read the full reviewThe pinnacle of the 45nm quad-core era. A legendary overclocker's chip that is now a collector's item.
Best for: Collector's showcase or extreme retro overclocking build.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i7-940 or Intel Core i7-975?
Based on our editorial ratings, the Intel Core i7-975 comes out ahead with a score of 8.8/10. That said, the best choice depends on your workload — check the spec and performance breakdown above for gaming, productivity and efficiency differences.
Which is faster for gaming, Intel Core i7-940 or Intel Core i7-975?
For gaming, the Intel Core i7-975 leads with a gaming performance score of 38/100 among Intel Core i7-940 and Intel Core i7-975.
Do Intel Core i7-940 and Intel Core i7-975 use the same socket?
Yes — all of these CPUs use the LGA 1366 socket, so they share compatible motherboards.