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Thread: Overclocking i5/17 and earlier intel cpu's a personal history.




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    Default Overclocking i5/17 and earlier intel cpu's a personal history.

    1.intel 386 sx25 4 mb ram
    system cost =$3000
    Overclock =sx33mhz ,user cost =$0.If bought as 33 mhz extra cost =$700.

    speed increase=32% for 0 cost.

    Moving thru various intel systems Ive used/owned/built,486sx dx,dx2,dx3,dx4,the speed increase for 0 cost was about the same.
    Initial pentium 90 would oc ro 100(mhz) by blowing on it n saying hey presto great for ultima underworld 2 and system shock1.
    I never did try for a higher speed. on a 90.

    3 year break for rl stuff.

    Intel celeron 300a..the return of the king.
    stock 300.. overclock 500.. speed increase 66% for 0 cost and totally stable

    The "wilderness years" amd duron 1200.
    Overclock capability .next to nothing and it allways ran hot anyway.

    Now..or at least 2004-2011
    (a)pentium D820 ,dual core in a piggyback form,sort of like the bugatti veyron engine but slightly cheaper.
    Overclock 40% but I no longer run it at that..core temp measurement only comes from one core ,even tho it shows as 2 so throttling can occur and u wont know it.
    Max stable 24/7 overclock (for me)=3.9ghz ,ie just below 40% speed increase,2.8 ghz default.

    (b)q8400 775 (stock speed=2.66ghz)
    max stable overclock 4.0ghz,with a good system.
    cost=20 % more for a 50% cpu speed increase(not 50% performance increase)

    passing over 1156 and 1366,which are of course clockable,but not in excess of 50% on air.

    (c)i5 2500k/i7 2600k in more detail:
    stock speed -3.3-3.4ghz but actually all versions can reach 3.7-3.8 stock with turbo,,,,

    2500 upgrade to 2500k cpu cost =$10-$20
    mbrd..h67 will do 3.7ghz but say $20-30 extra for a basic p67 or z68

    Leaving aside the memory aspect.

    2500k base speed 3.3ghz,will go 4.8ghz for 24/7 operation with a reasonable system,but reasonable means extra cash for nonintel cooler ,extra fan(s) etc say $100 over a dell spec.
    The "game breaker is standard say 3.3 but standard turbo= 3.7 which the intel cooler can handle no sweat.

    So lets see:
    1.3700mhz /100= 37 mhz=1% of max normal cpu speed.lets take it that any normal system should be able to achieve that.

    2.take 4500mhz as a maximum speed with a standard intel cooler and a clockable system.

    3.take 5.0ghz as a max 24/7 cpu speed with a fairly good air cooled system.

    4500/37= say a 27% speed increase to be optimistic.thats not a performance increase of course ..that would be more like 22%

    5000/37= a 35% speed increase which would probably be a 25% system speed increase:
    More cpu speed increase =lower overall pc performance increase relatively.
    ie 20% cpu speed increase might give 15% pc overall performance increase from standard.but 25% cpu speed increase might only give like 17%pc performance increase.

    cpu + 20=pc +15,cpu + 25=pc + 17-18 etc.


    Look at it another way and 3.3ghz increased to 5.0ghz is a 50% speed increase,but the 2500k processor should really be considered as 3.7ghz,mho.

    Taking into account the easy clockability at least to 4.4-4.5ghz.were really just seeing a continuation of the intel "you want a 30% overclock..here it is easy as falling off a log" but u aint never gonna get the overengineering error we made with the celeron 300 no more.

    Thats not to say newer cpu performance isnt better,newer instruction sets etc. I mean my i5 2500k at stock 3.3-3.7ghz is better than my q8400 at 4.0ghz and my D820 isnt in the frame.
    Last edited by kick; 07-15-2011 at 07:34 AM.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

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