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Overclocking

System Builder Marathon: TH's $2000 Hand-Picked Build
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Today’s build was one of the most challenging overclocks we’ve encountered on a Core i7 system. The most noteworthy issue was overclock-resistant RAM that threw errors so infrequently that it took hours just to find the cause.

Memory that initially appeared eager to run at DDR3-1600 eventually had to be clocked down to DDR3-1400, likely due to increased enclosure heat during gaming sessions. Once again we recommend blower-equipped graphics cards to anyone who can tolerate a little more noise in exchange for a superior overclock.

One setting that points to the memory heat spreaders as a potential problem is that this memory didn’t tolerate our “default overclocking” setting of 1.65 volts. Also notice that the CPU core is set to only 1.30 volts.

The memory worked at CAS 8 after we loosened up its advanced timings a little.

Our final CPU overclock of 4.03 GHz is limited exclusively by voltage, which in turn was limited by heat. The system supported 12 threads of Prime95 at 4.2 GHz and 1.35 V, but only when the graphics cards were idle. Combining FurMark with 11 threads of Prime95 caused heat to increase slowly to the CPU limit, and our goal was 100% stability under all conditions.

It appears our overclocking niggles are numerous, from RAM that gets too hot to graphics cards that exhaust heat into the case and a CPU that runs a little warmer at 1.35 V than our previously-tested Core i7-980X. Switching our fans from mid-speed to high-speed mode made the system howl, while dropping CPU temperatures by only 4° Celsius. But that only lengthened the time it took to overheat by around 50%. This served as further proof that we’d be stuck at 4 GHz with a 1.30 V core limit unless we were willing to make radical alterations to a build that, outside of its overclocking capabilities, appeared to be a fairly solid configuration.

By now a lot of readers who profess extensive knowledge of case design will begin blaming the Antec Three Hundred Illusion.  The only problem they'll have in getting us to accept that explanation is that we've used the same case in our June System Builder Marathon, with a pair of even-hotter GTX 470 graphics cards on the same motherboard, and had no such case temperature issues. Overcoming the internally-vented graphics card problem could be as easy as leaving the lower intake fan in front and installing an additional side fan as exhaust, but we had not ordered another fan.

There is a silver lining to this cloud, as AMD fans will get to see today’s system go clock-for-clock against the previous AMD-based build.

Familiarity might breed contempt in personal relationships, but it also compelling us to use MSI’s overclocking utility in spite of EVGA’s similar efforts. Based on RivaTuner, it’s free to users of any manufacturer’s cards.

The one thing that constantly pushes us towards MSI’s utility is its easily-configured fan map. This feature also removes the 70% fan limit we’ve seen when using Nvidia’s tuning software.

The frequencies stick at reboot, but the utility must be running for its fan map to work. We set it to start automatically at boot, minimized to the tray. Our final frequencies of 845 MHz core and GDDR5-4200 were determined after significant trial and error, which included the use of higher voltage levels that appeared somewhat unstable.

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Top Comments
  • 16 Hide
    tacoslave , September 30, 2010 6:28 AM
    should have just gone with a i7 920 and stuck a 5970 which would have been cheaper
  • 12 Hide
    Crashman , September 30, 2010 9:31 AM
    pinkfloydminnesotaA 970 and a drop to 460s? Are you kidding me? How much is newegg dropping in ad revenue for you to help them dump this overpriced stock?
    The 970 was a sub for the 1055T: Please outline a 970 build with GTX 480's for $2000 if you'd like to add credibility to your incredulity. Thanks!

    eyefinityWho wouldn't go with Eyefinity or Nvidia surround with $2k?
    Actually I proposed that for an upcoming SBM, but it couldn't be included this time since the former systems had already been decommissioned for shipment to the contest winners. So, who's up for an ATI EyeFinity/Nvidia Surround SBM?
  • 11 Hide
    cangelini , September 30, 2010 9:35 AM
    pinkfloydminnesotaA 970 and a drop to 460s? Are you kidding me? How much is newegg dropping in ad revenue for you to help them dump this overpriced stock?


    The story has the numbers to *prove* the improvements made to this build. This is a solid configuration that we have no problem recommending.

    Aside from that, we enjoy the luxury on the editorial side of operating completely separately from sales. In this case, our follow-up system was a good move editorially, and we get to give it away, to boot.

    Best,
    Chris Angelini
Other Comments
  • 2 Hide
    Randomacts , September 30, 2010 6:20 AM
    Yay more giveaways!
  • 16 Hide
    tacoslave , September 30, 2010 6:28 AM
    should have just gone with a i7 920 and stuck a 5970 which would have been cheaper
  • 2 Hide
    duk3 , September 30, 2010 6:31 AM
    I agree, however, this SBM was about 6-core performance.
    With an i7-930, a better heatsink, 2 470s and maybe an extra fan or 2 for the case is in reach.
  • 5 Hide
    Crashman , September 30, 2010 7:10 AM
    duk3I agree, however, this SBM was about 6-core performance.With an i7-930, a better heatsink, 2 470s and maybe an extra fan or 2 for the case is in reach.
    yes, the i7-930 and a couple 470's would be normal in the SBM $2000 PC.
  • 0 Hide
    cojj , September 30, 2010 7:14 AM
    how do I enter for the giveaway?
  • 1 Hide
    Crashman , September 30, 2010 7:40 AM
    cojjhow do I enter for the giveaway?

    Click the link in the announcement?
  • 2 Hide
    IzzyCraft , September 30, 2010 8:00 AM
    I guess these were more performance driven choices. I still will miss the case, i'd gladly trade a 920/930 for the SilverStone Raven
  • 2 Hide
    Crashman , September 30, 2010 8:33 AM
    IzzyCraftI guess these were more performance driven choices. I still will miss the case, i'd gladly trade a 920/930 for the SilverStone Raven
    Quality-wise, the Three Hundred is probably the best case you can get for under $80, but there should have been one more fan in the system given the internally-vented graphics cards the system ended up with. On the other hand, a lot of builders would be more than happy to "settle for" 4GHz at 1.30V, and the CPU will certainly live longer at the lower voltage.
  • -7 Hide
    brisingamen , September 30, 2010 9:02 AM
    i prefer the six core gtx 480 sli rig.
  • 2 Hide
    eyefinity , September 30, 2010 9:21 AM
    Who wouldn't go with Eyefinity or Nvidia surround with $2k?
  • 12 Hide
    Crashman , September 30, 2010 9:31 AM
    pinkfloydminnesotaA 970 and a drop to 460s? Are you kidding me? How much is newegg dropping in ad revenue for you to help them dump this overpriced stock?
    The 970 was a sub for the 1055T: Please outline a 970 build with GTX 480's for $2000 if you'd like to add credibility to your incredulity. Thanks!

    eyefinityWho wouldn't go with Eyefinity or Nvidia surround with $2k?
    Actually I proposed that for an upcoming SBM, but it couldn't be included this time since the former systems had already been decommissioned for shipment to the contest winners. So, who's up for an ATI EyeFinity/Nvidia Surround SBM?
  • 11 Hide
    cangelini , September 30, 2010 9:35 AM
    pinkfloydminnesotaA 970 and a drop to 460s? Are you kidding me? How much is newegg dropping in ad revenue for you to help them dump this overpriced stock?


    The story has the numbers to *prove* the improvements made to this build. This is a solid configuration that we have no problem recommending.

    Aside from that, we enjoy the luxury on the editorial side of operating completely separately from sales. In this case, our follow-up system was a good move editorially, and we get to give it away, to boot.

    Best,
    Chris Angelini
  • 3 Hide
    stm1185 , September 30, 2010 9:36 AM
    eyefinityWho wouldn't go with Eyefinity or Nvidia surround with $2k?


    Someone not wanting to spend an extra $1000 on monitors.
  • -7 Hide
    Anonymous , September 30, 2010 9:41 AM
    Quote:
    The 970 was a sub for the 1055T: Please outline a 970 build with GTX 480's for $2000 if you'd like to add credibility to your incredulity. Thanks!


    How about bouild with 930 instead and some nice SSD?

    Also I'd rather a case with proper PSU bottom mount, like Cooler Master does.
  • 1 Hide
    Crashman , September 30, 2010 9:50 AM
    rrrHow about bouild with 930 instead and some nice SSD?Also I'd rather a case with proper PSU bottom mount, like Cooler Master does.

    1.) The SSD is mentioned in the article. The problem is, it increases only synthetic test scores and the value analysis only uses "real world" benchmarks so it's basically a non-starter.
    2.) The i7-930 is nice, and would normally have been used if this build hadn't been designed as a direct alternative to the former six-core build. It will probably be used next time!
    3.) The Antec Three Hundred is "proper bottom mount", please check the photos!
  • 7 Hide
    feeddagoat , September 30, 2010 10:41 AM
    You should include boot times somewhere in performance measurments.
  • 6 Hide
    cangelini , September 30, 2010 11:07 AM
    feeddagoatYou should include boot times somewhere in performance measurments.


    Appreciate the feedback on this, guys. This is something we'll consider for the next SBM in the planning stages now!
  • 3 Hide
    Crashman , September 30, 2010 12:19 PM
    TheCapuletYou guys really need to get comfortable with the coolermaster cases. http://www.newegg.com/Product/Prod [...] 6811119233http://www.newegg.com/Product/Prod [...] 6811119215http://www.newegg.com/Product/Prod [...] 6811119228All three of these are far better values than the Antec you keep building in.

    I accidentally clicked the thumbs up icon on your message, and welcome the slamming of this comment as punishment. The case in this article was chosen for its excellent cooling-to-noise ratio, where the cases you picked are noisier and don't cool as well. It's all in the case reviews at this very site, really. None of the cases you picked even support dual front fans, and the original plan was to pair the dual front fans with graphics cards that vented externally.
  • 0 Hide
    rembo666 , September 30, 2010 12:50 PM
    I agree with the previous comments. Why go for a 6-core CPU? Unless you have some very specific requirements, you'd be much better off going with a quad-core and spending the money on an SSD. I guess the whole point of this thing is to be the best "benchmark machine", not necessarily the best bang-for-the-buck in the real world usage.
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