On Jan 24, 2010, at 11:21 PM, Dana Collins wrote:
If you have used PC-100 in a unit designed for faster RAM, I would
say that
is an anomaly, or you have the darned luckiest Mac on the planet!
I've noticed that sometimes RAM sold as slower RAM is actually a
faster variety. You need to inspect the individual chips on each
module to determine how fast they are. When faster RAM is sold as
slower, it will normally be labeled as the slower RAM, and will
sometimes identify to the system as slower RAM, but an inspection of
the individual chips in the sure way to know the speed. I believe this
occurs because it's simply cheaper to produce newer faster chips on
smaller dies than the older slower chips. Also, larger modules can be
made with less total chips. Thus, new RAM labeled as PC66 or PC100
might in fact be PC133 modules simply labeled as PC66 or PC100.
The same holds true with video cards, sometimes video cards have
faster VRAM chips than the card's firmware specifies, and these cards
are normally able to be safely overclocked to whatever speed the
individual VRAM chips support. When older slower chips run out of
stock they simply continue production using newer faster chips.
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