Intel® Core™ i7-3820

The Intel Core i7-3820 is a desktop processor with 4 cores and 8 threads, built on the Sandy Bridge architecture (32 nm process). It launched in Jan 2012. Clocks run from 3.6 GHz base to 3.8 GHz boost. A 10-MB L3 cache backs the cores (2.8 MB per core). It addresses DDR3 memory up to 64.23 GB across 4 channels. The chip drops into the FCLGA2011 socket and exposes PCIe 2.0 (40 lanes). Rated TDP is 130 W. Notable platform capabilities: Extended Page Tables (EPT).

The Intel Core i7-3820 scores 1,740 in single-core performance and 5,794 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 3,175 for overall performance, 6,202 for productivity performance, 6,319 for creator performance, 5,577 for engineering performance and 6,669 for gaming performance. Its multi-core throughput works out to 1,449 per core, 724 per thread and 45 per watt. Its computed efficiency index is 279. Its performance index is 39, so its overall performance is 61% below the Intel Core i5-12400 (index 100). Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the Intel Core i7-3820 scores 21,938 in integer math, 8,192 in floating-point math, 94,645 in compression, 1,734 in cryptography, 521 in physics simulation, 4,240 in vector SIMD, 29 in the prime sieve and 13,938 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 63% below in integer math, 82% below in floating-point math, 58% below in compression, 85% below in cryptography, 52% below in physics simulation, 73% below in vector SIMD, 57% below in the prime sieve and 38% below in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The Intel Core i7-3820 has 4 physical cores and runs 8 logical threads. It runs 2 threads per core. It runs at a base clock of 3.60 GHz and boosts up to 3.80 GHz.

The Intel Core i7-3820 is a desktop processor, belongs to the Intel Core i7 family, uses the Sandy Bridge architecture, carries the codename Sandy Bridge E and is manufactured on a 32 nm process. It launched in Jan 2012.

The Intel Core i7-3820 has 256 KB of L1 cache, 1 MB of L2 cache and 10 MB of L3 cache. That adds up to about 11.3 MB of cache, or 2.81 MB per core. Each core has 256 KB of private L2 cache.

The Intel Core i7-3820 has a 3-level cache hierarchy: L1 at 256 KB, L2 at 1 MB and L3 at 10 MB. L3 is the largest level and makes up about 89% of the cache listed here.

The Intel Core i7-3820 supports DDR3 memory, addresses up to 64 GB of memory, uses 4 memory channels, runs memory at up to 1,600 MT/s and delivers up to 51.2 GB/s of memory bandwidth. It does not support DDR5, DDR4 and LPDDR memory.

The Intel Core i7-3820 does not include integrated graphics, so a discrete graphics card is required for display output.

The Intel Core i7-3820 uses the FCLGA2011 socket, supports PCI Express 2.0 and provides up to 40 PCIe lanes.

The Intel Core i7-3820 has a rated TDP of 130 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

The Intel Core i7-3820 is manufactured by Intel. It launched at a price of $294.

The Intel Core i7-3820 is also identified by the model number i7-3820.

Feex has recorded 60% of the specifications it tracks for the Intel Core i7-3820. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Performance Cores, Efficiency Cores, Hybrid Architecture, All-Core Boost and Unlocked Multiplier. Architecture & Generation: ISA Family and Market Status. Cache: L4 Cache. Memory Support: ECC Memory. Platform & Compatibility: Package and Package Size. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size, Die Count and Foundry. Naming & Aliases: Normalized Name, SKU, Processor Number and Part Number.

Processors that use the same FCLGA2011 socket as the Intel Core i7-3820 and have the closest multi-core scores in the Feex database include Intel Xeon E5-1620, Intel Xeon E5-2650L, Intel Xeon E5-2630, Intel Xeon E5-2609 v4 and Intel Xeon E5-2658.