Professional Help: Getting The Best Overclock From AMD's A8-3870K

Features
By Don Woligroski
published

We recently hooked up with overclocking guru Sami Mäkinen to get his take on the best way to overclock AMD's A8-3870K APU. Using his advice, we tweaked five retail -3870Ks and compared their overclocked gaming performance to a discrete Radeon HD 6670.

Benchmark Results: Synthetics

The impact of our GPU overclock is obvious in 3DMark 11, and, in this synthetic metric, the A8-3870K outperforms our discrete card at the Entry and Performance presets. But the Radeon wins just slightly at the Extreme preset, though 1920x1080 is probably overly ambitious in most real-world games anyway.

Although our overclocking efforts emphasize graphics power, SiSoftware's Sandra diagnostic tool helps demonstrate how the different memory data rates and x86 core overclocks affect performance.

Arithmetic performance scales based on the overclock applied to all four cores. We'd expect the Multimedia benchmark to behave similarly.

The same observation applies here as well. Now, on to benchmarking the memory subsystem.

Memory bandwidth scales in a predictable way. We're eager to see how it translates to real-world gaming.

Don Woligroski
67 Comments Comment from the forums
  • buzznut
    This is pretty cool, this addresses most of the questions I would have about gaming with a LLano part. But it seems Trinity is right around the corner so I would still have reservations about recommending it. Except for the fact I just saw one of these quads for $90 at the egg, which does make a compelling case for folks on a tight budget.
    Reply
  • EzioAs
    Interesting read. Can't wait to see how much of an improvement the desktop Trinity APU brings seeing Llano is better than what I imagine it would be
    Reply
  • esrever
    Don is the best!
    Reply
  • peroludiarom
    Hi Don, you have wrote great article!
    I have just one question - do you try to overclock the memory controller as well, because its not mentioned in the article? Thanks in advance
    Reply
  • mayankleoboy1
    Llano is great, but i am waiting for the die-shrink to reduce power and heat.
    Reply
  • Wife's pentium intel g620 and amd 7750 on budget board and 8 gb budget ram .....only pulls 150 watts max !!!!!!!!lcost less and performs much better. Apu is a epic idea, alas still useless maybe trinity will save the day. Until then the hype and misleading performance promises will still make them money.
    Reply
  • Fokissed
    On page 2 there is a reference to hwbot.com, which seemingly doesn't exist anymore.

    Thanks for catching that, fixed to hwbot.org!
    Reply
  • freggo
    FokissedOn page 2 there is a reference to hwbot.com, which seemingly doesn't exist anymore.
    Makes you wonder how old the article is that a dead domain link made it into the text :)
    Reply
  • csbeer
    "So, we installed it (6670) in the overclocked system and disengaged its on-die GPU."

    I don't get why all these major sites don't test the dual graphics nature of the asymetrical xfire that Llano supports? Marry that APU with a 6570 or 6670 for maximum performance, that's the whole point of the Llano experience imo! I have a Llano notebook and am so hungry for info on other's experiments and results with the APU+DGPU.
    Reply
  • biggerbooger
    Excuse the noob question, but if you had say 2 x 4gb sticks rather than 2 x 2 and you put on a corsair H40 contained water cooler for example could you get much better OC performance? This is looking like a viable option.
    Reply