From: Shawn R. Lin (slin01_at_mail.orion.org)
Date: Sat Jul 22 2000 - 00:33:32 EDT
ReveilleX_at_aol.com wrote:
>
> thanks everyone, your responses are much appreciated, most notable those from benjamin. one last question, i swear (for now, at least)! i finally took a look at the acrobat files i've heard so much about from ibm. it states that the 120 mhz and 150 mhz models of the 560 and 560E had 60 mhz busses. is the performance hit that noticable? how does this affect battery life? sorry about the obsession over battery life, most of you guys have thinkpads and dont discuss it nearly as much. maybe my curiosity will die down once i get one and pick up a spare battery! and why does the newer "improved" model have a slower bus speed than the 133 mhz model? are the 120 and 150 actually closer in relation than to the others in their family? then again, they have different voltages, so i just don't know (obviously). anyone have any thoughts, please respond, or just tell me to shut up!
Hey, your email is not line wrapping (the whole thing is on one
continuous line).
Yes, 120MHz and 150MHz are on 60MHz busses. It's the same way with
desktop systems as well. Internal CPU multipliers are always whole
numbers or half numbers, I've never seen any other fraction. So to get
120 and 150MHz, they had to go down to a 60MHz bus. The P120 has a
multiplier of 2, 2*60=120. The P150 has a multiplier of 2.5,
2.5*60=150. 100, 133, 166, and 233MHz chips use a 66MHz bus (actually
66.6666-repeating). P100 multiplier is 1.5, P133 multiplier is 2, and
P166 multiplier is 2.5, and P233 multiplier is 3.5. Back when these
CPUs were popular, it was common practice to take a P150 and overclock
it by increasing the bus speed to 66MHz, thus forcing the P150 to run at
166MHz. The same method would cause a P120 to run at 133, or a P75 to
run at 100. So in a way, a 120 and 150 ARE in the same 60MHz bus family
(as are the original P60 and P90).
For what it's worth, I don't notice much (if any) difference in battery
life between my TP560 (P133) and my TP560X (P233MMX). There's a lot you
can do to increase battery life too, in the power management, you can
have the CPU speed reduce when under battery power.
-- Shawn Lin http://www2.cybercities.com/g/gmwbodycars/________________________________________________________ 1stUp.com - Free the Web Get your free Internet access at http://www.1stUp.com
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