On Sep 27, 2009, at 2:51 PM, nestamicky wrote:

> On 09-09-27 02:27 PM, Geke wrote:
>> Like Lyne, I have 896 MB (in my Digital Audio 466), and because it's
>> so cheap now (12$) I just bought a 512MB module to boost the Mac to
>> 1280 MB.
>> (It hasn't arrived yet, so I don't know the difference.)
>> Maybe some experienced guys here could give some hints what works
>> better when you have more RAM?
>>
> It is a given: more ram, faster processing. No questions.


Noooooooot exactly.

The generalized curve of performance versus RAM looks like this:

<http://tinyurl.com/yepugwa>

If you're low on RAM, you'll get a significant performance boost by  
adding more, however, continuing to add more does not offer the same  
boost.

Remember: Computer performance == I/O + CPU + RAM

All programs to some extent are dependent on all three.

If your problem is CPU (as is the case with video playback performance  
most of the time) adding more RAM will not help much (unless you're  
very low and the system is having to swap memory on and off the disk.)

What works better when you have more ram is, not surprisingly, memory  
intensive stuff. Running lots of programs at once, working on more or  
larger pictures in Photoshop, *some* video operations in iMovie and  
such.

Youtube? Not so much. The typical Youtube video is < 100 megs; the  
killer here is network IO and CPU.

Adding more memory when it's cheap (you can never be too thin, too  
rich or have too much RAM :-) is a sensible thing to do, but going  
from 896 to 1280 isn't going to give you a hugely noticeable boost,  
not nearly as much as going from, say, 512 megs to 1GB.



-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs



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