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Core i7-870 Overclocking And Fixing Blown P55-Based Boards

Benchmark Settings

While the focus of today’s article is power-draw increase due to overclocking, a few users won’t be satisfied unless they see the actual performance increase. For that, we repeated the full benchmark set from our previous motherboard round-up.

Test System Configuration
CPUIntel Core i7-870 (2.93 GHz, 8.0MB Cache)
MotherboardAsus P7P55D v1.02G, BIOS 0606 (09/03/2009)
Overclock 14.28 GHz at 194.7 MHz Base Clock, 1.448V Full Load
Overclock 23.77 GHz at 171.5 MHz Base Clock, 1.248V Full Load
Overclock 34.04 GHz at 183.6 MHz Base Clock, 1.344V Full Load
CPU CoolerThermalright MUX-120
RAMKingston KHX2133C9D3T1K2/4GX (4GB) DDR3-2133 at DDR3-1600 CAS 8-8-8-24
GraphicsXFX GeForce GTX 285 XXX Edition 670 MHz GPU, GDDR3-2500
Hard DriveWestern Digital VelociRaptor WD3000HLFS, 300GB 10,000 RPM, SATA 3Gb/s, 16MB cache
SoundIntegrated HD Audio
NetworkIntegrated Gigabit Networking
PowerCorsair CMPSU-850HX 850W, ATX12V v2.2, EPS12V
Software
OSMicrosoft Windows 7 Ultimate x64
GraphicsNvidia GeForce 190.62 WHQL
ChipsetIntel INF 9.1.1.1014

Thermalright’s MUX-120 cooler is barely big enough to cool our fully-overclocked i7-870 processor at 1.45V under the stress of eight Prime95 threads, even with an ambient temperature of 22 degrees Celsius.

Benchmark Configuration
3D Games
CrysisPatch 1.2.1, DirectX 10, 64-bit executable, benchmark tool Test Set 1: High Quality, No AA Test Set 2: Very High Quality, 8x AA
Far Cry 2Patch 1.03, DirectX 10, in-game benchmark Test Set 1: High Quality, No AA Test Set 2: Ultra High Quality, 8x AA
S.T.A.L.K.E.R. Clear SkyClear Sky Benchmark version Test Set 1: High Preset, DX10 EFDL, No AA Test Set 2: Ultra Preset, DX10 EFDL, 4x MSAA
World in ConflictPatch 1009, DirectX 10, timedemo Test 1: High Details, No AA / No AF Test 2: Very High Details 4x AA / 16x AF
Audio/Video Encoding
iTunesVersion: 8.2.1.6 x64 Audio CD ("Terminator II" SE), 53 min Default format AAC
Lame MP3Version: 3.98.2, wave to MP3 Audio CD "Terminator II" SE, 53 min
TMPEGEnc 4.0 ExpressVersion: 4.7.3.292 Import File: Terminator 2 SE DVD (5 Minutes) Resolution: 720x576 (PAL) 16:9
DivX 6.8.5Encoding mode: Insane Quality Enhanced multithreading enabled using SSE4 Quarter-pixel search
XviD 1.2.2Display encoding status = off
MainConcept Reference 1.6.1 Reference H.264 Plugin Pro 1.5.1MPEG2 to MPEG2 (H.264), MainConcept H.264/AVC Codec, 28 sec HDTV 1920x1080 (MPEG2), Audio: MPEG2 (44.1 KHz, 2 Channel, 16-Bit, 224Kb/s), Mode: PAL (25 FPS)
Productivity
Adobe Photoshop CS4Version: 11.0 x64, Filter 15.7MB TIF Image Radial Blur, Shape Blur, Median, Polar Coordinates
Autodesk 3ds Max 2009Version: 11.0 x64, Rendering Dragon Image at 1920x1080 (HDTV)
Grisoft AVG Anti-Virus 8.5Version: 8.5.287, Virus base: 270.12.16/2094, Benchmark: Scan 334MB Folder of ZIP/RAR compressed files
WinRAR 3.90Version x64 3.90, Dictionary = 4,096KB, Benchmark: THG-Workload (334MB)
WinZip 12Version 12.1, WinZip Command Line Version 3.0, Compression = Best, Benchmark: THG-Workload (334MB)
Synthetic Benchmarks and Settings
3DMark VantageVersion: 1.0.1, GPU and CPU scores
PCMark VantageVersion: 1.00 x64, System, Memory, Hard Disk Drive benchmarks, Windows Media Player 10.00.00.3646
SiSoftware Sandra 2009 SP4aVersion 2009.9.15.130, CPU Test = CPU Arithmetic / MultiMedia, Memory Test = Bandwidth Benchmark
  • cyberkuberiah
    but some of us would rather give some extra beans and go 920 , and have dual pcie2.0 x16 . a few extra watts doesn't matter too .
    Reply
  • FYI: Power consumption of switching cmos silicon increases with the square of voltage, and linear with frequency. The increases shown here seem to be in line with that, rather than the stated decrease in voltage regulator efficiency (which certainly does decrease, but probably much less).
    Reply
  • Crashman
    dan__gFYI: Power consumption of switching cmos silicon increases with the square of voltage, and linear with frequency. The increases shown here seem to be in line with that, rather than the stated decrease in voltage regulator efficiency (which certainly does decrease, but probably much less).
    Can you turn that into a more accurate estimate than 200W to 240W, where all that can be proven is that it's "high, but less than 240W"?
    Reply
  • jeffunit
    Are your power consumption measurements of the cpu, dc power or wall socket power? If they are the latter, which I suspect they are, then you have to factor in the power supply efficiency, as 150w socket, means 150w DC.
    Reply
  • bucifer
    I would be great to see how the more popular i7 860 or at least i5 750 scale with the voltage.
    I don't think i7 870 is a popular choice because of it's price (people would go for socket 1336)
    Reply
  • ctbaars
    Thanks for article.
    For me - This and previous articles have convinced me to game at stock, w/ tb+ settings on, and a high end GPU card and the i5 is most appropriate for my usage. I need to condition myself to turn off the computer esp. when noone is home.
    Reply
  • avatar_raq
    Although Thomas labels Asrock as "succeeds" I will not buy their motherboards, you'll never know what else this company ignores in the bios, and do you think they would fix that issue if it weren't for THG? After how many failing boards?
    Reply
  • tecmo34
    cyberkuberiahbut some of us would rather give some extra beans and go 920 , and have dual pcie2.0 x16 . a few extra watts doesn't matter too .I agree with you 110%... :D

    Also, I would like to see the voltage scaling using the i5 750, as mentioned by bucifer
    Reply
  • Onus
    A few extra watts being "used" is fine. A few extra watts being "wasted" is something else entirely.
    I don't see a howling difference on these overclocks either. If I bought an i7, that probably means I'd have little reason to OC it.

    While ASRock seems to be taking a "successive approximations" approach to improving their products, the ones I've bought so far have all been solid, but any OC has been mild.
    And, once again (even if it isn't quite epic), MSI = FAIL.
    Reply
  • jerreece
    I was glad to see this article. I was just thinking about this whole debacle this morning. :)
    Reply