System Builder Marathon, Sept. '09: $2,500 Performance PC

By Thomas Soderstrom
published

Power, Heat, And Efficiency

We mentioned earlier that the 1,000W power supply was probably a bad choice, since the 850W version was cheaper and had a higher efficiency rating. Let’s see how far overboard we went.

At our maximum overclock and with an unrealistically high load of three threads of Prime95 and with the fourth CPU core dedicated to FurMark's full-load graphics test, the overclocked configuration consumed a mere 879W from the wall. At our power supply’s approximate 82% efficiency (see chart), we really only needed a power supply with around 720W capacity. Thus, the super-efficient 80 PLUS Gold rated Corsair CMPSU-850HX could have been a great choice while providing enough extra power capability to support future upgrades.

Heat change from overclocking was minimized through increased fan speed.

With an average performance gain of 17% and an average power increase of 20%, the system loses 2% overall efficiency.

Thomas Soderstrom
Thomas Soderstrom
Thomas Soderstrom is a Senior Staff Editor at Tom's Hardware US. He tests and reviews cases, cooling, memory and motherboards.
100 Comments Comment from the forums
  • burnley14
    Just thinking about winning this system in the giveaway gets me excited.
    Reply
  • jj463rd
    Me too this is an awesome build.
    Reply
  • DjEaZy
    ... do the video compression using ATi Streem...
    Reply
  • The Quality of video on ATI streem is shit on sticks and doesn't even support high profile.

    The last build was a bit too odd for me but this one seems like a very nice chose of parts and on a larger screen set up makes a lot of sense the loss of i7 for AMD only build was a bit sad but the addition of those great SSD kind of makes up for me along with the nice chose of case and cooling. That case looks like it is very nice to work on.
    Reply
  • dirtmountain
    The Corsair CMPSU-850HX is rated Silver, not Gold. Nice build, good results, great work.
    Reply
  • @Dirtman

    http://www.80plus.org/manu/psu/psu_detail.aspx?id=25&type=2

    Check your sources because you have it wrong

    CMPSU-850HX ATX12V 850 90.38% Gold
    Reply
  • one-shot
    Please don't call RAID 1 a backup solution.
    Reply
  • dirtmountain
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011

    Newegg says differently. I did check sources.
    Reply
  • dirtmountain
    So does Jonnyguru
    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story2&reid=153
    I guess you just can't believe everything you find on a brands site.
    Reply
  • WINTERLORD
    now that is one slick gaming machine! could'nt imagine them frames rates on a big monitor. love the insides water cooling 3 radeon 4890's with room for a 4th. great pictures by the way lots of eye candy. you can tell alot of work went into tis kmonster. great article.
    Reply