yes, it was probably a bad idea, the chips may draw larger current
spikes, and the filter caps on the logic board may not be able to
provide stable enough power under these conditions. the other problem,
depending on the design, is the load (i.e. how much signal power it
takes) on the address lines. i wouldn't give up completely however,
they may work fine if you reset the cuda and zap the pram, some macs can
be funny that way. especially since you upgraded the cache i would
definitely zap the pram, i've seen this cause problems on a 7100 (not a
pci mac, but still a mac). sometimes part of the mac os knows more than
other parts it seems, which of course causes problems. in any case, i'd
definitely run techtool or another diagnostic even if the new ram
appears to work. if it's marginal a change in temperature could be
enough to make a difference.
> Date: Tue, 11 Sep 2001 22:02:39 -0700
> Subject: Memory upgrade on 7500
> From: Sheilia & Terry Scott <[EMAIL PROTECTED]>
> Message-ID: <[EMAIL PROTECTED]>
>
> Attempted to install a couple 128Mb (FPM 5V built with 16x4) sticks I'd
> ordered fm OWC while on my lunch break today. Along with the installation I
> also replace the 256K cache with a 512K. The system powered up and the new
> memory was recognized in the memory control panel and everything seem okay.
> Shut down and went back to work. Later, the wife went to check email and
> half way thru typing a new letter the system locked up and would not
> restart. When I got home I found no chime upon powering up but could hear
> the hd trying to access, but nothing on the screen,but the monitor's test
> pattern. Pulled ALL the old dimms and moved the new ones over to A1 and B1
> slots. Didn't work. Replaced the original dimms and removed the new 128's,
> kept the new cache module, everything back to normal :( Was it a bad idea
> to use 16x4? OWC website says:
> "These modules utilize 16x4 memory devices. This module converts the 16x4
> device operation to a address type that is compatible with your computer's
> memory controller. There is no performance degradation as a result of this
> conversion."
> And, they're a few dollars cheaper.
--
"In Germany they came first for the Communists, and I didn't speak up
because I wasn't a Communist.
Then they came for the Jews, and I didn't speak up because I wasn't a
Jew.
Then they came for the trade unionists, and I didn't speak up because I
wasn't a trade unionist.
Then they came for the Catholics, and I didn't speak up because I was a
Protestant.
Then they came for me, and by that time no one was left to speak up."
-- Martin Niem�ller, 1892-1984 (German Lutheran Pastor), on the Nazi
Holocaust (sorry, that's an umlaut on the "o")
Congressional Record 14th October 1968 p31636.
--
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