Sign in with
Sign up | Sign in

CPU Overclocking

System Builder Marathon, March 2011: $2000 Performance PC

We borrowed a bridge from another motherboard for our tests, but buyers who choose to instead assemble the system with included components can use a closer slot for the second card, at the same time reducing airflow to the card above it and knocking both slots down to x8 mode. Finally, anyone who upgrades to three-way CrossFireX will be forced to use the closer slot for their middle card, and the CrossFire bridges included with the graphics cards are long enough to reach from the first to the second and from the second to third PCIe x16 slots.

While “Sandy Bridge” overclocking is primarily limited to the manipulation of its Turbo Boost multipliers (on unlocked K-series models), the process is actually fairly simple. We locked in a 100 MHz base clock and increased the maximum Turbo Ratio to 48x, set Load-Line Calibration to High, and used an Offset Voltage of +0.100 V to push our voltage under load to 1.40 V without disabling power-saving features.

Remember when we said we thought that G.Skill’s less-expensive, 1.5 V DDR3-1600 CAS 8-8-8-24 likely used the same components as its 1.6 V DDR3-1600 CAS 7-8-7-24? Increasing our 1.5 V memory voltage to 1.6 V allowed us the choice of 7-8-7 timings at DDR3-1600 or 8-9-8 timings at DDR3-1866, and our calculator told us the later setting would perform better. Hint: 1866/8 * 7 = 1633, and 1633>1600.

Here’s where we can pick between locked-in and floating multipliers, though it doesn’t list these options in UEFI. Instead we see “C1E, C3 Report, and C6 Report” options, and disabling all three will force the CPU to run at its maximum Turbo Boost ratio full-time. The EIST setting does not produce similar results.

Because power management does not reduce the performance of most applications but does save a significant amount of energy on-average, we left these settings enabled for our initial tests. After later finding that these settings do reduce our hard drive throughput tests, we wound up re-benchmarking the system with C-States disabled. Both data sets are represented in today’s charts so that readers can make an informed decision regarding the importance of this feature.

Ask a Category Expert

Create a new thread in the Reviews comments forum about this subject

Example: Notebook, Android, SSD hard drive

Display all 144 comments.
This thread is closed for comments
  • 1 Hide
    wribbs , March 22, 2011 4:31 AM
    Was wondering when the SBM would return. Now if I just had an extra $2K. Now lets see how the lower price models hold up.

    Sure is a good time to be building a new PC.
  • 2 Hide
    duk3 , March 22, 2011 4:32 AM
    I'd love to win one of these.
    Especially this one
  • 1 Hide
    dragonsqrrl , March 22, 2011 4:34 AM
    Wow, nice system this time around. Excellent performance and efficiency, although I personally would've chosen a nicer case for a $2000 system. I know you guys have your reasons, and for the purposes of a purely price/performance oriented build it makes sense to skimp on the aesthetic qualities of a case, but for me personally, it's still nice to see a high-end case complement some high-end hardware.
  • 0 Hide
    toxxel , March 22, 2011 4:35 AM
    Nice system for 2k, wondering what the other systems will offer for their respective tier.
  • -2 Hide
    sparky2010 , March 22, 2011 5:02 AM
    since the 6990 is out, wouldn't getting that one card be a legitimate choice too? isn't it also at around $600?
  • 1 Hide
    illuminatuz , March 22, 2011 5:04 AM
    oh wow!!! you know what if you can really think you can make a performance pc.. i mean same performance.. but lesser cost..
    i am not saying OC and AMD thing.. same hardware..
  • -1 Hide
    dertechie , March 22, 2011 5:09 AM
    That system looks familiar. Very familiar. Almost. . . have you been spying on me?

    I built a system exactly like that, except with an 2500K, P8P67 Pro, single 6950 2GB, single SSD, DVD rather than BD, H50 and a cheaper PSU. Tears through Metro 2033 maxed at 1920x1200 like butter. When prices on 6950s fall some more I'll add a card and see if they can handle Eyefinity.
  • -3 Hide
    illuminatuz , March 22, 2011 5:14 AM
    and its possible.. just take a nice gtx 560ti rather two amd sli and take 8 gig ram.. since anything above 8 gig will give diminishing returns and 500 gb hdd is more than enough i think.. buy a cheaper case, (punch holes to make it cooler :p ) thats it.. same cpu same mobo and everything else same. you can also opt for cheaper 1155 mobo. i think gigabyte's got some.. or asus maybe.. no need for some two pcie and crap.. you can take a higher gpu.. say like gtx 580 or 6990.. well sli will give value if you are going for long term.. and you can install server's power.. they are cheap and of higher quality (thats what i heard from my pc vendor). i think there better be another marathon where there are the best pc at lowest cost.. that would make more sense rather giving budget.. so that people can know what they can make with the money they got.. since not all have exactly 1000$ or 2000$ there are people from other countries as well following so keep up the good work fellas ^_^/~~
  • 0 Hide
    tapher , March 22, 2011 5:36 AM

    Props on the build, dawgs. Daddy likes!

    Breath is bated for the bevy of builds to come!
  • 1 Hide
    andy5174 , March 22, 2011 5:44 AM
    Contest is limited to residents of the USA

    not again.....
  • 0 Hide
    lunyone , March 22, 2011 5:46 AM
    Not what I'd buy for a build around this price, but not too shabby. I wouldn't complain if I were to get this build for free, or nearly free :) 
  • 0 Hide
    Zeh , March 22, 2011 5:54 AM
    Can't say CPU and GPU were hard choices. Well built overall, but I'd try to use the 2nd SSD money into upgrading to 2x6970s instead. Might have given (even) better scores at 2560*1600!
  • -1 Hide
    joshyboy82 , March 22, 2011 6:00 AM
    Bought my current PC on Black Friday and it seems that I'm already a current Generation behind. All I can do is add the 990X, another GTX 580, and a new power supply, then wait for obsolete-ness.
  • 0 Hide
    bombat1994 , March 22, 2011 6:12 AM
    this test really should have been done with bios flashes. that what enthusiasts generally use with 6950's. but still nice to see just how powerfull the 2600k is.

    how would a system like this perform if watercooled. i presume it will kill most of the gpu heat problems and the cpu should stay bout the same
  • 0 Hide
    dertechie , March 22, 2011 6:16 AM
    Everyone suggesting the 6990, why?

    Crossfired 6970s give the same performance, OC about as well, cost the same $700, and you can be in the same room as them without ear plugs. My old Pentium D's fan was annoying, the 6990 is apparently even worse.

    Now, water cooled 6990s (yes, plural), now you're talking, but then we're into $3,000+ territory, and 5 DisplayPort monitors with good vertical viewing angles on top of that (read: 5x 24" IPS, $2500, minimum).

    bombat1994this test really should have been done with bios flashes. that what enthusiasts generally use with 6950's. but still nice to see just how powerfull the 2600k would a system like this perform if watercooled. i presume it will kill most of the gpu heat problems and the cpu should stay bout the same

    These are 1GB 6950s. Without a BIOS for a 1GB 6970, you can't flash those, and AMD has not released a 1GB 6970. We also never know when/if they'll start fusing off extra shaders now that specs are finalized.
  • -1 Hide
    Proximon , March 22, 2011 6:20 AM
    Your PSU also lacks the full 5 year warranty of most Seasonic PSUs. Not a criticism, just wanted to make sure folks understood all the differences.
    I like the build, though I think you overspent on the Blu-ray drive and could have used the savings on a better case.
  • 0 Hide
    Rizlla , March 22, 2011 7:15 AM
    Dam would I love to have that PC. You can clearly see that the PC world is going forward.
  • 1 Hide
    legacy-za , March 22, 2011 7:22 AM
    WTB: International Competition

    Hell, I would even pay any import tax and shipping costs :S
  • 0 Hide
    silverblue , March 22, 2011 7:41 AM
    Good to see the HD103SJ in there. Just bought one of these myself, though astonishingly, the UK price is even cheaper - £38 ($61) - though I haven't found one without shipping costs of at least £5 ($8).

    Excellent build, definitely worth it over the previous $2,000 system. I can't help but wonder how well those 6950s will perform once AMD's drivers really make use of the VLIW4 architecture, so there's another potential bonus. Now if only this was available in the UK... ;) 

    I did my own comparison for the UK, using various matches thrown up by Google. Unfortunately, I can't find the Illusion variant of the Three Hundred, plus the SeaSonic PSU seems a bit too expensive/difficult to find. I opted for an Antec 850W PSU at £104 ($166, assuming conversion £1 = $1.60). The cooler was £40 at the cheapest ($64). My prices came to £1,490 approx. including all shipping. That'd come out at about $2,400, so it's not a massive hike over US prices.
  • 0 Hide
    cangelini , March 22, 2011 7:43 AM
    bombat1994this test really should have been done with bios flashes. that what enthusiasts generally use with 6950's. but still nice to see just how powerfull the 2600k would a system like this perform if watercooled. i presume it will kill most of the gpu heat problems and the cpu should stay bout the same

    Just wait until tomorrow ;-) Don isn't quite as shy about flashing his bits!
Display more comments