May 1, 2012

AMD A8-3870K Socket FM1 CPU Review

The box art is in keeping with the AMD A-Series APUs albeit replacing the white colour for Black, of course giving a clear visual representation that the contents are that of an unlocked Black Edition APU. As with the A8-3850, the A8-3870K does not feature Turbo core, though the architecture supports the implementation of it as seen with various lower end APUs. AMD have managed to slightly improve IPC of the K12 CPU cores over the K10.5 as seen in the Phenom II CPUs even though Llano does not contain any L3 cache. The integrated memory controller can natively support DDR3 1866MHz which is intended to feed the bandwidth hungry Radeon cores in the HD 6550D iGPU.
The average Llano overclock on air appears to be around 3.7GHz and appears to ring true with this sample. Booting in using a x37 multipler @ 1.5V held ok but was not 100% stable. After playing around with various base clock and multiplier settings, the CPU proved stable at 3.68GHz a good 22.5% increase. The Radeon HD 6550D is already a force to be reckoned with in the iGPU world, with 400 Radeon cores and a base clock of 600MHz, as of writing there is no better integrated solution on the market. After spending a little time looking for a max clock, I was surprised when I eventually reached a cracking 960MHz, though unstable. Hitting reverse gear a bit I found a stable max speed of 920MHz, a heftin' 53% increase.
We see 12-16% performance increase merely by shifting memory speeds from 1333MHz-1866MHz. While the iGPU may be nearing it's max performance @ 1866, with a huge 53% overclock, it is likely going to require 2133-2600MHz memory to fully realise the potential of the HD 6550D. While the increased CPU performance may contribute to the extra performance, that is minimised in our tests by running the games at 1920x1080 resolution to create a more GPU limited environment. Regardless, for a chip that can currently be found from as little as $127 and potentially matches the performance of a $80 discrete graphics card, it is nothing short of impressive and would serve well in budget gaming systems or lan rigs. Source

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