K6-2 300 at 375 and beyond???

[MoLy]

I guess I am a newbie at this and just got lucky. From various overclocking-websites I get the impression that it is almost impossible to overclock AMD K6-2 cpus very much.

But I just got my K6-2 300MHz to do 375Mhz - apparently very stable. I raised the FSB from 66MHz to 75 and the clock multiplier from 4.5 to 5. My mobo supports an FSB of 83MHz as well, but I get a Windows protection error every time I boot. Even after haven increased the cpu core voltage from 2.2 to 2.5. I'm not sure I want to go beyond that - eventhough I would get it to do 416MHz. Any suggestions?

[spidi]

if u have got a good heatsink fan combo on the cpu u can push a little further with the cpu's core voltage if not then get one and fit it with artic silver thermal compound the k62300 will take upto around 2.9v but it heats up real quick so I'd try at around the 2.6vcore or 2.7vcore and also up your I/O voltage to about 3.4v or 3.5v above all keep an eye on the cpu's temperature or you'll be SMOKIN !!!before u know it if u feel up to it take off the cpu's cap and then fit your heatsink this makes the cpu more stable cause it can shed more heat
HA who says k62's don't overclock
u could try multiplier of 5 X and fsb of 83mhz @ 2.6 or 2.7vcore and up your I/O voltage to 3.4v or 3.5v and see
hell u can pick up a k62400 or 450 in scotland for £25 -£30 so I'm sure u can get one real cheap

good luck

[MoLy]

Hi Spidi,

thanks for the input.

Unfortunately, my mobo does not provide me with the oppurtunity of 0.1 voltage increments. Only the steps: 2.2, 2.5, 2.8, 2.9, 3.2, 3.3 and 3.5V are available.

I might try the 2.8V option, but do you think that the core voltage is what causes my windows crash (error message/lock up after initial splash screens)?

Do you think a could use a K6-2 400 cpu on my board?. It supports 60,66, 75 and 83FSB with a maximum multiplier of 5.

Thanks!

[spidi]

hi Moly
if u have a good heatsink and fan combo by all means try it at 2.8vcore and it should be ok suck it and see I've had up to 3.5vcore going into a k62 and a k62+550 without melting the sucker so far but I was keeping a close eye on the cpu temperature and had the mobo set to cut out at 70c just in case ( I was trying for over the 700mhz mark got to 690mhz stable) my pal yoshi has got to over 800mhz on his k62+550 but thats with cryo cooling ULP!!!!!!
the k62350 to 550 range can drop straight in and will
run at 83mhz no prob. hhmmm!! underclocking and with a 5 X multi. will give u a rock solid stable 415mhz
I've just tried the bros old k62350 and it pulls 415mhz at 83mhz with a multi of 5.0 X @ 2.5vcore and a temp of 49c full load no problem
my advice would be to see how far your 300mhz will go and if it doesn't go far enough for u by the fastest k62 chip u can afford and if u want to go further then u will need another mobo or if u have the dosh go for an amd duron cpu on a soltek SL-75KV2-X or a
SL-75KAV-X mobo the most bang for the least bucks

cheery

[spidi]

ps moly
did it post up and then fail to verify the dmi pool or did it get into windoz start up and then crash or give a windoz protection error etc. or did it start to post then fail
give us some info on your system make up mobo what memory etc.

cyotfs m8

[MoLy]

My system is this:

- AMD K6-2 300MHz with a basic heatsink/fan combo
(2.2V)
- Alton MB-575 Topgun mobo with TXPro chipset (quite unknown - and not existing today - but an attractive little mobo with 1MB of L2 cache etc. when I bought it 4 years ago). See previous posting for FSB and core voltages supported.

- 96MB of SDRAM
- Win 98 (v. 4.10.1998) -danish
- Helios Rush Voodoo1 6mb video

With a setting of 83MHZ FSB, clock multiplier =5 and core voltage of 2.5, there is a 'Windows protection error. Please restart your computer'-message after the initial Win splash screens. i.e. just before the Win wallpaper/desktop should come up.

I might try the 2.8 core voltage. My mobo manual says nothing about I/O voltage settings/options/jumpers.

If I try the 2.8V trick, what is the max CPU temp (Celsius or Fahrenheit) I should let the CPU get to, before I cut the power? How do I most accurately monitor it (manually)? Do you think a Win2000 might get it more stable?

Thanks
MoLy

[Rapha]

Be very carefull with 83FSB because it means your PCI runs at 41.5. You should loose a lot of data on your HD.
<<
2.2, 2.5, 2.8, 2.9, 3.2, 3.3 and 3.5v
>>
7 settings ! Do you have jumpers ? If you compare setting for 2.8/2.9 and 3.2/3.3, don't you see a jumper that give +0.1v ? If you apply same difference to 2.5v, you should get 2.6v.

[weesa20]

How is Yosj\hi making it to 800+ MHZ? That would require a 133+ X 6 and I don't know of any Super7 chipset that will run at 133 FSB?

[spidi]

yo rapha , moly
rapha is that ment to be could lose data from HD drive or should
it's possible for this to happen but it's only happened twice to me in the last 8 years of overclocking so maybe I'm a tad blase about it
rapha is right to point this out tho but I've tried this many times and had no problems with data loss (touch wood)
I've also just tried this with an old s7 mobo that used to have k62 266mhz on it and shoved in the bros k62350 and it posted at 5 X 83mhz =415mhz at 2.7vcore it was stable and didn't crash even in deus ex tho. it a bit slow (32mb tnt2vanta pci graphics card) tho I did have a few visual artifacts that would not be there normaly on my system and the old crystal pci sound card was ok too
hhmmm!! only one way to tell whether or not it'll work and thats to try it but do a back up first

cyotfs

[spidi]

hey weesa
there are a few mobo's out there that allow settings past 133fsb gigabyte ga5aa ga5ax epox etc but at normal temps they are none too stable at this sort of fsb and are prone to crashing and toasting the cpu's, it took two k62+550's to get me to 690mhz with hints from yoshi san I can go abit(sic!!) further but past 700mhz it tends to crash after 30 - 35mins I don't know how yoshi san is getting it to run but it's part of his thesis or doctorate
and he has plenty of cash and facilities at his disposal he's one very lucky dude(note green envious tone!!)
and he's not the only one out there hitting the 800mhz mark either

vatvh u later m8

[MoLy]

in reply to rapha (posting # 7)

I cannot make sense of the jumpers. There are six jumpers marked A to F. The settings in the manual are these:

None on/connected: 2.2V
F on: 2.5V
E & F on: 2.8V
D & Fon: 2.9V
C & F on: 3.2V
B & F on: 3.3V
A & F on: 3.5V

Put it on a piece of paper, and you'll get the picture. I don't see how to get the 2.6 and 2.7V increments?

Why does the HD data loss occur? heat? what causes the possible data loss? ways to deal with it?

Thanks,

"Bill Gates' wife claims her husband's company is named after his penis"

[Rapha]

Just an idea. I'am not sure. Try at your own risk or ask for other opinions.
Base=2.2v
F=0.3v
A=1v
B=0.8v
C=0.7v
D=0.4v
E=0.3v
For 2.6v, I would try D alone (2.2v+0.4v). 2.7v is impossible.

About your HD, 41,5Mhz for the PCI is above the spec (33Mhz). Some HD's don't like it. 37.5Mhz (75/2 or 112/3) is more in the tolerance limit. Make a backup of your data and check for corrupted directories (scandisk) after several writes.
UDMA enabled can increase the risk of data loss. If you detect some problem, it's better to stay with UDMA enabled and lower PCI speed.