Athlon people and all overclockers pleas help.

[miha76]

I am very pised with my two Athlon CPUs.

Well they work great, but I can`t overclock the way I would like to.

Components:

CPU 1 K7 Athlon Classic 500 with 650 core and 3,3nS L2, 0,25 micron

CPU 2 K75 Athlon Classic 550 with 650 core and 3,6nS L2 0,18 micron.

Mainboards MSI K7Pro (Irongate) and Epox EP-7KXA (VIA KX133).

Both CPUs work 100% stabile @ default power 1,6V @ 700MHZ and both can run @ 1/2 L2 100% stabile, I have tested that for many times, and I have 0 problems.

Both CPUs simply refuses to work @ enything higher then 700.

My question is why? becouse they work @700 @ default 1,6V.

I am able to overclock on my EPOX MB both CPUs up to 770 MHZ (110FSB) but thing is that my K75 (0.18CPU) needs extrimly high 1,75V to run @ only 770MHZ, is that maybe litle strange.

I have modified cooling for both CPUs, no HTP, cooler is directly on CPU with 3 fans on every cooler, and L2 is resolder on both CPUs to 1/3.
And I have good cooling for case

I am bit frustrated becous I read how people overclock 650MHZ CPUs up to 800 and even higher, and I can`t get not even 750 with 0.18 micron CPU (K75).

What am I doing wrong.

Coolers are big, I have lots of fans, and even 0.18 micron CPU but no go, not higher then 700MHZ.

@ 700 both CPUs run @ usual temp of 30C or 28C for 0.18 micron CPU.

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The worst system is not the one that has slowest QIII frame rate, but one that not works corectly.

[CTho9305]

that voltage seems OK - a tbird 700 runs at 1.7 volts.

I assume you use a GFD and not just the FSB, right?

[oh, if you have 770 with a 110 fsb then you clearly have a gfd ]

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Impossible? Watch me.

[This message has been edited by CTho9305 (edited 10-29-2000).]

[iAMDking]

R U sure you soldered the L2 in the right places? my athy 500 550 core does 750@1.65V and my athy 600 600 core does 916@1.70V. and my athy 750@1035@1.75V.
i would recheck your L2 the two slower ones of mine do there speeds at 1/2 the 1035 is at 2/4 maybe 1/3 if i wana go higher.
so keep your l2 where it is and boot at say 600. check to make sure it's running at 2/5 or 1/3 i would use 2/5.
if all eles fail try using a GFD if your soldering. i soldered mine but well. maybe i was lucky.
iAMDking.

[miha76]

iAMDking

I am soldering multiplier and L2, power I can adjust from BIOS.

I have resolderd L2 to 1/3 and that menas

R101 +
R102 -
R103 +
R104 -
R106 -
R107 +
R110 -
R111 +

L2 is NEC-SEC Type 6

+ resistor (circuiet lo)
- no resistor (circuit high)

I have checked every resistor "thousend" times, and I have begin to think that Tom`s Athlon Classic overclocking guide is wrong.

In windows I check L2 state and WCPUID detetcs 1/3 L2, and then if I need faster L2 I can speedup L2 with h-odas utility, and 3,6ns and 3.3ns chips work great @ 350MHZ or 1/2 L2, and I can mesure that in QIII and memory benchmarks.

So I think L2 is not the problem and I think PSU is not the problem, atleast it should not be problem with K75 CPU (0.18 micron).

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The worst system is not the one that has slowest QIII frame rate, but one that not works corectly.