Chaintech MB

[Zca]

I have a CT-5AGM2 motherboard (Super 7; VIA) and AMD K6-2 450 MHz, and I can't get it to work on 100 MHz bus. The system becomes extremely unstable, mostly I get "Windows protection error" during boot, even a Windows install on a blank formatted HD fails before finishing. Lower bus speeds work fine, currently I'm at 83 MHz bus and 5.5x multiplier and everything runs perfectly. Although 95 MHz bus seems a bit suspicios (IE crashes at Java applets which it normally doesn't and such). I've tried removing all cards except VGA (which is a Riva TNT2 and I doubt that it is a problem) and it didn't help. I've tried changing the memory, which worked ok on a PIII on 100 Mhz bus, and it didn't help. Do you have any ideas as to what to try next?

[MR COMPUTER]

Couple of things.
Running 95 or 98? 95 requires a patch file.
That chip was made in two voltages. 2.2 and 2.4. Pull the heatsink and verify the voltage.
Last observation is still memory... http://sysopt.earthweb.com/forum/wink.gif

[DHatAVI]

How about trying to up the voltage by .1 or .2 volts on the core, or a different
processor.

David

[drn]

LIke others have said up the voltage a little and install the K62 patch

[Peter M]

Maybe your RAM isn't up to it. Try clocking the RAM to 66 MHz - the VIA chipset can do that (while keeping the CPU and L2 cache at 100), and the 5AGM2 AFAIR offers that feature.

Regards, Peter

[Zca]

Ok, so I tried changing voltage from 2.2 to 2.4 V (it says 2.2V on the CPU) and all the same. I found some jumper that says "memory speed", when short it is "AGP-bus speed", otherwise "CPU-bus speed". I've tried both. Nothing!! http://sysopt.earthweb.com/forum/frown.gif http://sysopt.earthweb.com/forum/frown.gif

I'm running Win98 SE with all patches. But I guess it doesn't matter since the installation itself fails, does it?

I also noticed something else. When I shut down the PC and then turn it back on, it won't start, it won't even POST. I have to wait a few minutes before starting it.

Well I guess that MB voltages are screwed all across, is there anything else I can do (apart from dumping the MB and getting a PIII)? anything? pls?

[Peter M]

Out of ideas, maybe you have a board with not-really-100-MHz-capable L2 cache chips there. The performance loss at 83 MHz 5.5x instead of 4.5x 100 is something one can certainly live with.

btw, doesn't that board have any inbetweens? 90 MHz 5.0x would also be a perfect match, and a 95 MHz 5.0x overclock might also be feasible on a 2.2V K6-2/450 with a board that just-so doesn't run at 100.

Regards, Peter

[bdunn]

If 83*5.5 works bu 95 doesnt how about 83*6.

[Rat]

What are you doing for extra cooling? Sounds a little like a heat problem.

Rat...

[Peter M]

No heat problem, certainly. If it works at 450 MHz = 5.5x 83, with no less heat than at 450 MHz = 4.5x 100, then extra cooling won't help the latter. FSB frequency doesn't add to power consumption at all.

Regards, Peter

[Zca]

Peter: exactly, heat is AFAIK about CPU freq.

As I said, there is also 95 MHz bus, I used 4.5x 95 (~430) but it was "suspicios" in a way that IE 5.0 became even more unstable then the usual http://sysopt.earthweb.com/forum/wink.gif for example, this page crashed IE... normally it doesn't... 5x 95 wouldn't boot, but it is an overclock anyways.... I think I could live with the present setting.... anyways, thank u very much folks, it was very educational http://sysopt.earthweb.com/forum/smile.gif