AMD® Phenom™ II X4 840T

The AMD Phenom II X4 840T is a desktop processor with 4 cores and 4 threads. Clocks run from 2.9 GHz base to 3.2 GHz boost. A 6-MB L3 cache backs the cores (2.1 MB per core). Rated TDP is 95 W.

The AMD Phenom II X4 840T scores 1,275 in single-core performance and 2,337 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 1,726 for overall performance, 3,304 for productivity performance, 3,580 for creator performance, 2,249 for engineering performance and 4,409 for gaming performance. Its multi-core throughput works out to 584 per core, 584 per thread and 25 per watt. Its computed efficiency index is 177. Its performance index is 21, so its overall performance is 79% 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 AMD Phenom II X4 840T scores 6,370 in integer math, 4,692 in floating-point math, 52,086 in compression, 653 in cryptography, 227 in physics simulation, 1,197 in vector SIMD, 15 in the prime sieve and 6,460 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 89% below in integer math, 90% below in floating-point math, 77% below in compression, 94% below in cryptography, 79% below in physics simulation, 92% below in vector SIMD, 78% below in the prime sieve and 71% 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 AMD Phenom II X4 840T has 4 physical cores and runs 4 logical threads. It does not use a hybrid performance and efficiency core layout. It does not support simultaneous multithreading, so its thread count equals its core count. It runs at a base clock of 2.90 GHz and boosts up to 3.20 GHz.

The AMD Phenom II X4 840T is a desktop processor and belongs to the AMD Phenom family.

The AMD Phenom II X4 840T has 512 KB of L1 cache, 2 MB of L2 cache and 6 MB of L3 cache. That adds up to about 8.5 MB of cache, or 2.13 MB per core. Each core has 512 KB of private L2 cache.

The AMD Phenom II X4 840T has a 3-level cache hierarchy: L1 at 512 KB, L2 at 2 MB and L3 at 6 MB. L3 is the largest level and makes up about 71% of the cache listed here.

The AMD Phenom II X4 840T has a rated TDP of 95 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.

Feex has recorded 37% of the specifications it tracks for the AMD Phenom II X4 840T. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: Efficiency Cores, All-Core Boost and Unlocked Multiplier. Architecture & Generation: Codename, ISA Family and Market Status. Cache: L4 Cache. Memory Support: Max Memory, Memory Channels, Memory Bandwidth, Memory Types, DDR5 Support, DDR4 Support, LPDDR Support, ECC Memory and Max Memory Speed. Graphics: Integrated Graphics, Graphics Model, Graphics Base Clock, Graphics Max Clock, Execution Units, Display Outputs and Max Video Memory. Platform & Compatibility: Socket, Package, Package Size, PCIe Generation and PCIe Lanes. 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, Foundry and Launch Price. Naming & Aliases: SKU, Model Number, Processor Number and Part Number.

Processors close to the AMD Phenom II X4 840T in the Feex database, matched by socket, family, segment, architecture, core count, TDP and benchmark scores, include AMD Phenom II X4 B95, AMD Phenom II X4 840, AMD Phenom II X4 850, AMD Phenom II X4 925 and AMD Phenom II X4 B97.