AMD K6-3

[Tricky]

I have an AMD K6-3 @450mhz in an VIA Apollo VP3/MVP3 chipset. I can goto 5.5X. It runs at 2.4V and I can goto 2.7. I have a descent heatsink/fan combo on it. I have got it to run @500 but gives me registry errors. Can clock bus speed down to 95 from 100 and 5X to get to 475 but is not stable. Got it to boot with 2.5V at 5X still not stable. Any suggestions.

[OCPhreak]

give up!!! Seriously though the K6-3's weren't too good at overclocking...the L2 cache on the chip wasn't the greatest at running at anything over 450 I'm afraid....

[Tricky]

What about switching to an AMD k6-3+???

[Rapha]

I have the same CPU and chipset. (FIC motherboard with 2MB L3). My K6-III runs overclocked 24/24 7/7 since 1 year.
I assume your CPU is a K6-III AHX (2.4v stock). So this chip can be overclocked to 500 but it's very difficult to keep it cool. Voltage must be increased to 2.6v/2.7v.
http://www.aceshardware.com/Spades/read.php?article_id=108

I don't know what you mean with <<descent heatsink/fan combo>> but you MUST have a BIG heatsink with a BIG fan (at last 26CFM). Case cooling can help too (1 case fan for entry and case fans for exhaust for having a good air flow from front down side to rear up side).

The heatcap on top of the CPU is concave so lapping CPU and heatsink gives a good result.

Removing the thermal pad at the back of the heatsink and replacing it with thermal paste is mandatory. (if lapping, you'll have to do it)

[spidi]

u could try upping your I/O voltage to 3.4 or 3.5v as this may sort out the registry problems another possible solution is to take the cap off the cpu and refit your heatsink fan combo with arctic silver this will make the cpu more stable as it can get rid of more heat this way .
the main problem with k63's is that the level 2 cache tends to run hot most of the time so oc.ing the chip makes this cache run even hotter hence more unstable and it can be a right pain in the ass
the k62500's and 550's and k62+550's overclock much better m8

cheery

[Tricky]

If I put a Super Orb on it , do you think that will take the heat off of it. I will be able to take the voltage like the artice said to 2.6-2.8. But will the orb take enough heat away?

[spidi]

ok tricky
I'd probably go with a taisol 742092
heatsink fan combo but I'd replace the taisol fan with a ys tech 60mm beasty this gains about 1.5c to 2.0c and use the taisol to cool my chipset by the way the super orb has circular rebate in the heatsink base and this can cause trouble with k62's and k63's m8 it's fine for the socket a cpu's tho.

cyotfs dude