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Overclocking

System Builder Marathon, Sept. 2011: $500 Gaming PC
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Our C3 revision Phenom II already has a high 1.4 V voltage ID, and, once again, the M3A77DE overvolts a bit beyond that figure. CPU-Z reports 1.416 V at idle and 1.448 V under load. The resulting core temperatures (under load) already push our comfort zone at 58 degrees Celsius. At that temperature, the CPU fan is disturbingly loud, buzzing along north of 6000 RPM.

The procedure for overclocking included dropping the voltage, raising the CPU multiplier a half step at a time, testing for stability, and keeping an eye on core temperatures. We found the best combination of stability, frequency, and heat at 1.3375 V in the BIOS, resulting in 1.352 V at idle and 1.384 V under load.

Here, our Phenom II did better than we anticipated, reaching 3.8 GHz, even as load temperatures dropped 1-2 degrees compared to the stock settings.

The memory was unwilling to overclock, failing at 1.65 V to reach 1600 MT/s at CAS 10 timings. In fact, we lost stability pushing beyond 1400 MT/s at CAS 9 timings, severely limiting the tweaking we could do by combining multiplier and reference clock overclocking. Instead, the CPU-NB frequency was bumped up a bit to 2200 MHz, and memory timings reduced to 8-8-8-22 1T.

The Sapphire Radeon HD 6870 had a decent amount of headroom, topping out at 965 MHz for the GPU, while the memory clocks were stable through our maximum tested 1200 MHz (4800 MT/s). We backed these down a bit and ran our second set of data with the core at 960 MHz and 1180 MHz (4720 MT/s) memory.

Before heading into our gaming benchmarks, we’ll take a look at the test system and benchmark configurations. Bear in mind that this quarter's system benefits from a more powerful graphics card and utilizes newer Catalyst graphics drivers, while the prior system's CPU was not overclocked at all.

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Top Comments
  • 23 Hide
    slicedtoad , September 22, 2011 5:18 AM
    very nice article, i was wondering how the 955 oced would do against the i3.

    While there are many unthinkable things in this build, the low price of $500 is also unthinkable. That's less than an ipad....
  • 17 Hide
    Outlander_04 , September 22, 2011 6:36 AM
    Its a good $500 build .except it cost $520 and the motherboard is a dead end part .
    For another $30 you can include an AM3+ board with the latest 970 series chip set that is fully compatible with Bulldozer.
    As it is this build is a dead end , and its out of date in 3 weeks

    But its still a better computer than the previous intel build
  • 17 Hide
    alchemy69 , September 22, 2011 5:05 AM
    Time to bring on the usual motley crew of fanboys and everyone who just knows that they could do better.
Other Comments
  • 17 Hide
    alchemy69 , September 22, 2011 5:05 AM
    Time to bring on the usual motley crew of fanboys and everyone who just knows that they could do better.
  • 4 Hide
    Anonymous , September 22, 2011 5:05 AM
    Ugly case! I know I am stating the obvious, but seriously...
  • 13 Hide
    Outlander_04 , September 22, 2011 5:13 AM
    The i3 2100 is a remarkable cpu , but it just cant beat 4 physical cores and a bit of overclocking .
  • 23 Hide
    slicedtoad , September 22, 2011 5:18 AM
    very nice article, i was wondering how the 955 oced would do against the i3.

    While there are many unthinkable things in this build, the low price of $500 is also unthinkable. That's less than an ipad....
  • 6 Hide
    Anonymous , September 22, 2011 5:22 AM
    Why have the charts reduced to an unreadable size for this article?
  • 12 Hide
    Zero_ , September 22, 2011 5:28 AM
    Nice. Finally someone who knows how to get value for money. I approve :p 
  • 16 Hide
    zooted , September 22, 2011 5:38 AM
    This is my favorite build this sbm. I just love the fact that you can have a true 1080p gaming experience for $500 bucks.
  • 7 Hide
    mayankleoboy1 , September 22, 2011 5:38 AM
    whats with the fuzzy and unreadable charts?
  • -2 Hide
    bobfrys , September 22, 2011 5:44 AM
    This is a tad bit better then the one I built off of the earlier build i used from toms. (Built it soon after school ended).
  • 11 Hide
    lunyone , September 22, 2011 5:51 AM
    This is probably the ONLY $500 build (except for the very 1st one) that I've agreed on mostly (not liking the case too much, but it works in this budget).

    The last $500 build just was crap generally (micro-ATX and not many options on the mobo, IMHO).

    This budget gaming rig is really close to what I'd build for a friend/family member that wanted to have a gaming rig. I'd change a few things, of coarse, but the overall direction (and selection of parts) is SPOT ON, IMHO!! Good job guys at TH!!!
  • 2 Hide
    hmp_goose , September 22, 2011 5:59 AM
    What's that? The Surprise Fourth Build will not be the $2k version? Someone's going to poke around in the grey area between the i3-2100 and the i5-2500? How much extra cash will be allowed?

    Why do posts like this "sound" like the something from the '60s Batman TV show?

    Tune in tomorrow! :-P
  • 3 Hide
    Tijok , September 22, 2011 6:17 AM
    First off, great build, the balance of parts is great, and almost exactly what I would recommend to someone in this budget area.

    But seriously, what is going on with the small/ low res charts?
  • 4 Hide
    _Pez_ , September 22, 2011 6:19 AM
    This Rig Rocks ! I would only change the case :)  maybe a cooler master storm.
  • 1 Hide
    Rizlla , September 22, 2011 6:34 AM
    The first of this months builds that are great and you can see there is a budget that was thought of.
  • 17 Hide
    Outlander_04 , September 22, 2011 6:36 AM
    Its a good $500 build .except it cost $520 and the motherboard is a dead end part .
    For another $30 you can include an AM3+ board with the latest 970 series chip set that is fully compatible with Bulldozer.
    As it is this build is a dead end , and its out of date in 3 weeks

    But its still a better computer than the previous intel build
  • 1 Hide
    Proximon , September 22, 2011 6:54 AM
    It was a good comparison, and the right build to do, because we got an honest look at the differences and advantages to each platform.
    That said, I would have to say that it's not the right $500 system for most gamers. The P II X2 555BE would perhaps let you get a better board, making it a smarter buy at $520, and of course some excellent Rosewill combo deals (that are always on) would help out with the case and PSU.
  • -4 Hide
    cobra5000 , September 22, 2011 6:56 AM
    Nice to see the 955 finally get to stick it to the i-3. That and the old boy is what, two years old? Way to go AMD! Its a shame Tom's could'nt point that out. Not really surprising though, with the tiny charts hiding how the 955, DOMINATED, the i-3 at high resolution.
  • 0 Hide
    cmcghee358 , September 22, 2011 7:30 AM
    Nicely done. I can atest to the volume of that freaking stock fan too. I had mine up to 7000 RPM on my HTPC. I HAD to replace it, it sounded like an old ventalation fan in a bathroom
  • 4 Hide
    Martell77 , September 22, 2011 7:56 AM
    @Cobra5000 - Are you really that happy that a stock SB I3 is beaten by a P-II x4 OC'd just past the AMD X4 top end proc? Ya, its 2 years old but the I3 isn't exactly a high end part. If the P-II had kept up or beaten a I5, then you should be cheering. I think you meant "the tiny charts hiding how the 6780, DOMINATED, the 6850 at high resolutions." The wins the 955 got were in productivity apps due to its 4 physical cores.

    I'm hoping that bulldozer will finally give Intel something to worry about. Some pricing wars would be really nice. But I'm not holding my breath.

    I think it would be interesting if they changed the video card to a 6850 and show how much the processor change actually made a difference.
  • 2 Hide
    cypeq , September 22, 2011 8:18 AM
    mayankleoboy1whats with the fuzzy and unreadable charts?


    Toms is saving up bandwidth by annoying readers.
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