CPU Comparison
Intel Core i7-975 vs Intel Core i7-990X
A side-by-side comparison of specs, performance and value. The Intel Core i7-975 Extreme Edition, launched in June 2009, was a refined refresh of the original Nehalem flagship, the i7-965. Utilizing the improved D0 stepping of the 45nm Bloomfield die, it offered a higher base clock of 3.33GHz and a turbo boost of 3.6GHz. As a four-core, eight-thread processor, it represented the absolute pinnacle of quad-core performance for the LGA 1366 platform. The Extreme Edition branding guaranteed an unlocked multiplier, making it the ultimate chip for enthusiasts. Despite retaining the 130W TDP, the D0 stepping improved thermal behavior and overclocking headroom. Priced at $999, it was a halo product aimed at uncompromising power users. The i7-975 held the performance crown until the six-core Gulftown chips arrived, cementing its legacy as the peak of the 45nm era.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
8 threads help, but low IPC limits modern apps.
Capable for basic legacy tasks, but severely outpaced by modern hardware.
Gaming
Best single-core of the Bloomfields, but still bottlenecks modern games.
Slightly better than the 980X due to clocks, but still bottlenecks modern games.
Virtualization
Good for basic VMs and legacy server setups.
12 threads are still somewhat useful for basic VM labs.
Efficiency
130W TDP is highly inefficient, though slightly better than 965.
130W TDP remains highly inefficient compared to modern nodes.
Specialized Performance
AI / ML
- Incompatible with modern AI workloads
- No modern AI acceleration
- Too slow for modern inference
Content Creation
Gaming
- Low IPC
- No AVX2
- Bottlenecks modern GPUs
- Low IPC
- Lacks AVX2
- Bottlenecks modern GPUs
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
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
Pros
- Highest clock speeds for LGA 1366
- Unlocked multiplier
- 6 cores and 12 threads
- 12MB L3 cache
- Excellent legacy multi-threaded performance
Cons
- Very expensive on the used market
- Obsolete platform
- High power consumption
- No integrated graphics
- Lacks modern instruction sets like AVX2
Competitors & Alternatives
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.
Intel Core i7-990X
- RivalCompare head-to-head
- AMD FX-8150Rival
Desktop
- Intel Xeon X5690Rival
Workstation
- AMD Phenom II X6 1100TRival
Desktop
- Intel Core i7-2600KRival
Desktop
- Intel Xeon X5675Alt
A much cheaper server equivalent that can be overclocked on X58.
- Intel Core i5-12400FAlt
A modern budget CPU that obliterates it in every metric.
- AMD Ryzen 5 5600Alt
A modern 6-core CPU with vastly superior efficiency and IPC.
- Intel Core i7-3930KAlt
The direct successor platform offering better upgrade paths.
Our Verdict on Each
The 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 reviewThe fastest processor of its generation. A collector's dream today, but practically obsolete for modern workloads.
Best for: Keeping an existing X58 system alive as long as possible.
Read the full reviewFrequently Asked Questions
Which is faster for gaming, Intel Core i7-975 or Intel Core i7-990X?
For gaming, the Intel Core i7-990X leads with a gaming performance score of 42/100 among Intel Core i7-975 and Intel Core i7-990X.
Do Intel Core i7-975 and Intel Core i7-990X use the same socket?
Yes — all of these CPUs use the LGA 1366 socket, so they share compatible motherboards.
Which has more cores?
The Intel Core i7-990X has the most cores. Core counts: Intel Core i7-975 (4 cores), Intel Core i7-990X (6 cores).