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The AMD Athlon X4 840 was a desktop processor with 4 cores. It is part of the Athlon lineup, using the Kaveri architecture with Socket FM2+. Athlon X4 840 has 4 MB of L2 cache and operates at 3.1 GHz by default, but can boost up to 3.8 GHz, depending on the workload. AMD is building the Athlon X4 840 on a 28 nm production process using 2,411 million transistors. The silicon die of the chip is not fabricated at AMD, but at the foundry of GlobalFoundries. You may freely adjust the unlocked multiplier on Athlon X4 840, which simplifies overclocking greatly, as you can easily dial in any overclocking frequency.

With a TDP of 65 W, the Athlon X4 840 consumes typical power levels for a modern PC. AMD's processor supports DDR3 memory with a dual-channel interface. The highest officially supported memory speed is 2133 MT/s, but with overclocking (and the right memory modules) you can go even higher. For communication with other components in the machine, Athlon X4 840 uses a PCI-Express Gen 3 connection. This processor does not have integrated graphics, you will need a separate graphics card.

Hardware virtualization is available on the Athlon X4 840, which greatly improves virtual machine performance. Programs using Advanced Vector Extensions (AVX) will run on this processor, boosting performance for calculation-heavy applications.

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