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Mainstream: AMD A10-5800K - quad-core, 3.8GHz
The AMD A10-5800K APU is the flagship of Trinity series, and features quad-core CPU with up to 3.8GHz/4.2GHz Turbo clock, and an AMD Radeon HD 7660D GPU to provide best-in-class performance and 3D gaming.
The A10-5800K is also fully unlocked, making it overclocker-friendly.
A super CPU for anyone thinking of building a mainstream PC.
Image source: AMD.
Mainstream: Gigabyte GA-F2A85X-UP4
A superb choice for the FM2 socketed AMD A10-5800K APU.
This motherboard supports 64GB RAM, and USB 3.0, and comes with seven SATA 6Gb/s ports, HDMI, DisplayPort, and D-Sub/DVI video output. A solid, well-made board that offers comprehensive features for those looking to do a little overclocking.
Image source: Gigabyte.
Budget: Intel Celeron G540 - dual-core, 2.5GHz
Nowhere near as attractive as the Core i7-3970X Extreme Edition, but the Sandy Bridge-based Celeron G540 is a great choice for those looking for those looking for a cheap processor.
Along with a solid 2.5 GHz processor, you will receive on-board Intel HD graphics, which means that you don't need a separate graphics card. It's not going to run Crysis 2 with all the options turned up to the max, but it's a fine general purpose GPU.
Image source: Intel.