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Lynnguist
10-01-2000, 01:39 PM
Just re-built an older (1997) ATX with Award BIOS. I had 32M of PC66 and I wanted to upgrade the memory. I added 64M of PC100 an it boots ok but reads the 64M as 32 and has other errors like rebooting itself on a whim. It does this when the 2 sticks are mixed or when when the PC100 is installed alone. I know that the PC100 will clock down to 66 when they are mixed. The manual dosen't list PC100 or PC66 it just says SDRAM and that's what I've got. What do you think?
P.S. BIOS flashed

They call me Techno Geekhead...I love this forum...thanks to those who started it and keep it running.

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Lynn

Bmcdanold
10-01-2000, 06:12 PM
Are both the ram sticks ECC or non-ECC because once when i mixed ECC and Non-ECC i had the same problem. It might just be a defective ram stick that needs to be returned hehe. Try the new ram stick in a different computer and see if you get similar results with it.

Lynnguist
10-02-2000, 01:07 AM
The first time it happened, I took the RAM back assuming that was the prob. Got another stick...same problem. I don't know what you mean by ECC. They are both unbuffered.

Thanks,

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Lynn

Paleo Pete
10-02-2000, 10:14 AM
Here's an article or 3 in the PC Guide that can describe it better than I can

Parity non-parity ECC Memory (http://www.pcguide.com/ref/ram/packParity-c.html)

ECC (http://www.pcguide.com/ref/ram/errECC-c.html)

Mixing Parity/ECC and Non parity Memory (http://www.pcguide.com/ref/ram/errMixing-c.html)

Error Correcting Code (ECC) (http://www.pcguide.com/ref/hdd/geom/errorECC-c.html)



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Lynnguist
10-03-2000, 01:42 AM
OIC
Both are non-parity, the problem persists.

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Lynn

Paleo Pete
10-03-2000, 10:04 PM
Something you might check, some motherboards will not support double sided memory, only single sided. That might be a big part of it.

The rebooting could be related to that, and could also be heat, CPU, motherboard, power supply, or bad memory. since you have tried the memory chips individually, I would doubt it to be bad memory, that should have shown up by testing each by itself.

The PC 100 should run at 66MHz, as you said, but might also be causing trouble. Theoretically, it should work, but not always in practice, although it's not common that it causes problems.

Could these be different access times? That might also have something to do with it. One being 7ns and the other 8ns, or both being too fast or too slow for the system.

I hate this kind of problem!! Too many possibilities to narrow it down easily...

Come to think of it, could also be a BIOS issue. Check the BIOS and try setting the BIOS or Setup defaults, whichever it shows. You'll have to reset the hard drive and floppy configuration. Check also for a Performance Default setting. It might work as well.

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Charles Kozierok
10-03-2000, 11:58 PM
Apparently, older systems sometimes have problems with newer modules that use higher density memory chips. How many chips are on the newer module and how many on the older?

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Charles M. Kozierok
Webslave, The PC Guide (http://www.PCGuide.com)
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Paleo Pete
10-04-2000, 01:08 AM
Good call ixl, I never thought about the density angle...makes sense though.

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