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Thread: a little help with overclocking

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    Theoretical Element Spud1's Avatar
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    a little help with overclocking

    The internet is awash with gudes etc but i can never find any that really help me much

    What i want to do is overclock my AthlonXP 2800+ barton as far as possible

    I understand some of the basics, ie upping the FSB, but the bit that confuses me/gives me trouble is the voltages

    Ive got an XP2800+ barton
    MSI k7 Delta -ILRS (nforce2 ultra)
    2x512 Crucial PC2700 DDR

    and plenty of cooling

    currently i can o/c my FSB up to 169 without the memory bus changing speed, and that gives me a perfectly stabe PC and an overclock of about 50mhz
    but i wanna go higher natch, up to 200 if poss

    The problem is that going much higher gives me BSOD's, which are almost all memory related. Bear in mind i have not touched the Voltages, so i think that this could be the problem but I dont know how far i should increase them

    Can anyone help me get the most out of this rig ?

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    Official Member luke313's Avatar
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    You could up the ram voltage a notch, as that is what is probably stopping you upping the fsb further, as it is designed for 166mhz speed. If that doesn't work, consider lowering the ram timings.

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    would lowering the timings be (for example) from

    8 4 4 to 7 3 3
    or 8 4 4 to 9 5 5

    ?

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    slave of the hypnotoad
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    from 8-4-4 to 7-3-3 is lowering them, there should be one more number there though, therefore something like 5-2-2-2 is about the best you might practically be able to achieve.

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    In a place called VERTIGO CrapshoT's Avatar
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    try lowering your multiplyer to say 10x200 fsb and then see if it boots dont forget 200fsb is really pc 3200 speeds
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    The XP2800+ Barton should be capable of around 2.2-2.3ghz although you'll most likely need to raise the voltage on it a little. I wouldn't take a Barton higher than 1.75v, maybe even 1.70v is a little high. O/c'ing by raising the FSB is complicating things a little so I'd suggest you raise the multiplier 0.5x at a time in order to see how far your CPU can go on default voltage. When you find the limit (be sure to stress the CPU) then see how much higher an extra 0.5v on the CPU core can get you (expect much more heat). Once you find the CPU's speed limit this way, knock a little off for long term stability and then see how far your FSB can go keeping your CPU at that safe peak ghz.

    TBH gains above 400FSB aren't huge by any means, you may prefer to keep to 333FSB (esp for stability's sake) or else invest in some PC3200. Investing in PC3200 is well worth it if your mobo can't understand the 5th FID bit and as such peaks out the multiplier at 12.5x as FSB is then the best way to go. If you do stick with your current RAM then by upping the voltage slightly it should clock that bit higher stably but bear in mind it can be very hard to fully stress test your RAM for stability and those added volts can stress it in ways it really wasn't designed for. If you do overvolt your RAM I'd suggest 0.1v - 0.2v above the default. Rem using higher (slower) RAM timings as mentioned above will also allow your RAM to run that bit faster (in mhz). The diff between the fastest and slowest RAM timings are only about 1% anyway so the added mhz are likely to prove the better perf tweaker.

    PS. Be sure to o/c your 4200 as that will give you MUCH more of a speed boost when gaming, it should get from 250/444 to around 300/500 or if the default is 250/500 to around 300/550. Best of luck!
    Last edited by Austin; 08-08-2003 at 08:45 PM.

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    thx for the help guys

    my 4200 is overclocked to 322mhz and 500mhz and that's great ;D

    I cant increase the multiplier tho can I cos the CPU is locked isnt it?

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    Resident abit mourner BUFF's Avatar
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    Originally posted by Spud1
    I cant increase the multiplier tho can I cos the CPU is locked isnt it?
    No, it isn't locked.

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    Theoretical Element Spud1's Avatar
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    cool thought it was like with the pallys and tbreds methinks i'll have a play with it

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    Theoretical Element Spud1's Avatar
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    bah cant find the option to change multipliers in the bios, means fkin about with jumpers, i'll have to do it tomorrow

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    Most TbredA and ALL TbredB and Barton are unlocked. The only problem is with multipliers over 12.5x, you need a mobo which understands and can manipulate the 5th FID bit in order to access the whole range of multipliers. Changing the multiplier enables finer control with o/c'ing (eliminates other variables) and also enables very high FSB speeds. C heck your mobo manual as that should clearly ststae the jumpers which have to be set, BIOS is more usual with modern kit, perhaps you need the latest BIOS?

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    Theoretical Element Spud1's Avatar
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    it is in the bios just named differently (cpu ratio), the manual explained all tho

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    ok so heres what happens

    I change the multiplier to 13x, and the CPU goes to 800mhz :/ (default multiplier is 12.5x)

    any ideas? i've got the FSB up to 171 and its stable so far

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    In a place called VERTIGO CrapshoT's Avatar
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    put the multiplyer to 10 and your fsb to 200 then try and boot up
    this will give you 2 gig which your cpu should handle easy
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    Yeah but his RAM is PC2700, Crucial is very good but I wouldn't run it that far out of spec esp as a big jump as you seem to suggest. I'd suggest you try 13.5x and higher with a 333FSB, see if it sets it right, if it doesn't your mobo can't manipulate the 5th FID bit needed for multipliers over 12.5x so you really should invest in PC3200 which will allow you to release the full potential of your CPU and mobo.

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    Theoretical Element Spud1's Avatar
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    ok :/ seems like the mobo cant calcualte the 5th FID :/ i can take the fsb all the way up to 200 with the multiplier at 10x tho and it posts, but windows crashes when it boots - memory errors as you would expect i'll leave it at 171x12.5 as this seems to be nice an stable, i get very nice performace anyway so o/cing any more aint necesary

    thanx for all the input tho

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