Quick Verdict
A powerful and expensive Lynnfield chip that delivered top-tier performance in 2009, though completely obsolete today.
Overview
Launch
Sep 8th, 2009
Status
End-of-lifeGeneration
Core i7 (Lynnfield)
Market
Desktop
The Intel Core i7-870 is a high-end desktop processor launched in September 2009, based on the 45nm Lynnfield architecture. Operating at a base frequency of 2.933 GHz and boosting up to 3.6 GHz via Turbo Boost, it was the fastest Lynnfield chip at launch. It features 4 cores and 8 threads, supported by an 8 MB L3 cache. Utilizing the LGA 1156 socket, it brought the Nehalem microarchitecture to a more accessible platform than LGA 1366. It integrates a dual-channel DDR3 memory controller and 16 PCIe 2.0 lanes directly on the CPU. Like other Lynnfield chips, it lacks an integrated GPU. With a 95W TDP, it was relatively manageable to cool. The i7-870 was the premium choice for gamers and enthusiasts in 2009, offering excellent multi-threaded performance. It was eventually overshadowed by the unlocked i7-875K, but it remains a solid representative of the early Core i7 desktop era, though obsolete today.
The i7-870 was the flagship of the Lynnfield lineup. With 4 cores, 8 threads, and a 3.6 GHz turbo, it offered excellent performance for gaming and content creation.
Its 95W TDP made it efficient enough for standard cooling, and it dominated the high-end mainstream market in 2009.
Specifications
Performance
Fastest Lynnfield at launch, but obsolete now.
Good for legacy VMs.
Handles old games well but bottlenecks modern titles.
95W TDP is acceptable for 45nm.
- •PCIe 2.0 only
- •No AVX support
- •Requires discrete GPU
- •No AI hardware
- •Unsuitable for modern inference
Architecture
45nm
Process Node
Lynnfield
Codename
4C / 8T
Core Config
8 MB
L3 Cache
95 W
TDP
Architecture Overview
The Core i7-870 is based on the Lynnfield die, a mainstream variant of the Nehalem architecture. It integrates a dual-channel DDR3 memory controller and 16 PCIe 2.0 lanes directly onto the CPU. Manufactured on a 45nm process, it houses 774 million transistors on a 296 mm² die. The architecture employs Hyper-Threading, allowing 4 physical cores to process 8 threads simultaneously. Turbo Boost dynamically increases the clock from 2.933 GHz to 3.6 GHz based on demand and thermal headroom. The 870 was the highest bin of Lynnfield silicon at launch, requiring premium binning to achieve its 3.6 GHz turbo. It lacks an integrated GPU, relying on discrete graphics. The locked multiplier limits overclocking to Base Clock (BCLK) adjustments, though it could still reach 3.8-4.0 GHz with good cooling. It communicates with the P55 chipset via DMI, providing sufficient bandwidth for mainstream desktop workloads.
CPU Design
4 cores, 8 threads, 45nm process, 774M transistors.
Memory Subsystem
Dual-channel DDR3-1333 integrated controller.
PCIe & I/O
16 PCIe 2.0 lanes for discrete graphics.
Overclocking
Locked multiplier, limited BCLK tuning.
- Integrated memory controller
- Hyper-Threading
- Turbo Boost
- Higher IPC
Key Highlights
- High base and turbo clocks
- 8MB L3 cache
- Quad-core with HT
- Good 2009 performance
- Obsolete platform
- No integrated graphics
- Locked multiplier
- Expensive at launch
History
The Core i7-870 launched in September 2009 as the flagship of the Lynnfield lineup. It offered the highest clock speeds of the initial LGA 1156 CPUs, with a 2.933 GHz base and 3.
6 GHz turbo. It was the premium choice for gamers and power users who didn't want to spend the premium on the LGA 1366 platform. The 870 delivered excellent performance, easily handling the games and applications of its era.
However, it was overshadowed less than a year later by the i7-875K, which offered an unlocked multiplier for a similar price. The 870 remained a popular high-end option until the Sandy Bridge release in 2011. Today, it is remembered as a fast but expensive chip that marked the peak of the initial Lynnfield rollout before Intel shifted focus to unlocked K-series processors.
Improvements over Previous Generation
- Integrated memory controller
- Hyper-Threading
- Turbo Boost
- Higher IPC
Alternatives & Competitors
Should You Buy It?
Not Recommended for the right buyer
Maintaining a legacy retro gaming rig.
Avoid if…
- Building new
- Need modern efficiency
- Wanting upgrade paths
Use Cases
Interesting Facts
It was the fastest LGA 1156 CPU until the i7-875K and i7-880 arrived.
The i7-870 could often overclock to 4.0GHz via BCLK.
It was popular in high-end pre-built gaming PCs.
Lacked the triple-channel memory of the i7-950.
People Also Ask
Can you overclock the i7-870?
Yes, but only via Base Clock (BCLK) since the multiplier is locked.
Does the i7-870 have integrated graphics?
No, it requires a discrete GPU.
What is the TDP of the i7-870?
The TDP is 95W.
When was the i7-870 released?
It was released on September 8th, 2009.
How many cores does the i7-870 have?
It has 4 cores and 8 threads.
What socket does the i7-870 use?
It uses Intel Socket 1156.
What memory does the i7-870 support?
It supports dual-channel DDR3-1333.
Is the i7-870 good for modern gaming?
No, it lacks AVX and bottlenecks modern GPUs.
What is the max turbo frequency of the i7-870?
The max turbo is 3.6 GHz.
Does the i7-870 support Hyper-Threading?
Yes, it supports 8 threads.
Frequently Asked Questions
What is the L3 cache size of the i7-870?
It has 8 MB of shared L3 cache.
What manufacturing process is used for the i7-870?
It is built on a 45nm process.
Does the i7-870 support Virtualization?
Yes, it supports VT-x.
What is the base clock speed of the i7-870?
The base clock is 2.933 GHz.
What chipsets are compatible with the i7-870?
P55, H55, H57, and Q57 chipsets.
Can I use DDR4 with the i7-870?
No, it only supports DDR3.
Does the i7-870 have PCIe 3.0?
No, it supports PCIe 2.0.
Is the i7-870 unlocked?
No, the multiplier is locked.
Is the i7-870 still manufactured?
No, it is End-of-life.
Does it support NVMe SSDs?
Not natively, requires a PCIe adapter.