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http://www.insanely-great.com/news.php?id=1530
PowerLogix Downclocking Upgrade Cards?
By Remy Davison, Insanely Great Mac
January 14th 2003
Cooling, 'safe' operating temps may be the reason.
Using a magnifying glass, and presumably some tweezers, MacBidouille may have
established that some PowerLogix upgrade cards are using downclocked processors.
Looking at a PowerLogix DP 800 card, the CPU is labelled XPC7455RX867PC, which is
built to run at 867MHz. This is apparently not a Motorola part number; there are
supposed to be only 933 or 1GHz 7455s.
This is not unusual and there's nothing inherently wrong with this; CPUs have 'safe'
operating speeds; depending on the CPU, some can run much faster than the clock with
which they are labelled. It's not unusual, for instance, for a bunch of IBM PowerPC G3
processors, rated at, say, 300MHz, to be run at 400MHz. 300 may simply be the label
for the machines they were slated for.
Apple has also done this with its current range of Power Mac towers; hardware hackers
have successfully overclocked 867MHz machines to 1GHz, and 1GHz to...more than that.
Some have even claimed to have the 1.25GHz DP Power Macs running (unstably( at 1.5GHz.
Heat (and, therefore, cooling) is a major factor, and PowerLogix may well have
determined that the safe operating temperature for an 867CPU in a DP set-up was
800MHz. Nevertheless, MacBidouille claims that a 'rated' 867MHz CPU PPC7455 should
run to 900MHz.
Analysis: We've contacted PowerLogix for comment and will report any addenda they'd
like include in this report. No comments were available at time of publication.
I've also has reports of a Wallstreet 300 upclocked to 366MHz, but it ultimately ran
at 333MHz, because 366 was too unstable. As if Wallstreets don't run hot enough...
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