Hi, Claudio.
I have some experience with LTSP and LTSP-like environments, so I can
shed some light to your doubts.
Memory, as you may already know, is the cheapest and most substantial
upgrade you can make on your machine. The statement "the more the
better", in this case, is true. I would recommend you to get at least
2 gigs; this amount would be enough for now, but if you want some
scalability, regarding number of users or even applications, why not
more?
There is a friend of mine who uses to setup a swap partition on a
ramdisk, so he never uses the disk for memory management. This would
save a lot of processing and disk usage for you. When you have so much
users and start using swap, the performance gets worse very easily,
and this is a real problem, because so many users will keep the server
much busy all the time.
In a "memory usage by-user" approach, Jim uses to recommend 50~75 megs
of RAM per user; but this is just an estimative if you really have no
clue of how much RAM you will spend on the server.
Now, about the hardware: AMD has two advantages: price and
performance. Hyperthreading doesn't work as it should on the Pentium.
It, instead, uses bandwidth of the processor to "simulate" a second
processor. Surely it has more performance than in single-processor,
but comparing to an equivalent AMD, most graphics show it has more
disvantages than advantages. Take a look at Tom's Hardware Guide site
and see it for yourself.
I bought, three months ago, a AMD 64 2800+ processor with 640k of
cache for R$ 420,00 (note: this is brazillian currency, it is about R$
2,5 / US$ 1,00). I found it pretty cheap comparing to Pentiums.
Hope to have helped, cheers!
--
Eduardo Costa Lisboa
Sure it did.. Thanks! One thing that bothers me though is the high price
of paired memory to make up those 4GB on dual channel configuration. Do
you know of any good and cheap brand 1GB DDR400 memories here in Brazil?
(yeah.. we are kinda neighbors :) )
Cheers!
Claudio Henrique
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