Thanks for the great info. I will do like you said fest3er and order 2 512. Can you explain though why the 266 non-ECC is better than the 333 ECC? Or will the answer just make my brain hurt? :-laf
The Celery processor (which I believe you said you have) has a a 'slower' front-side bus; it runs memory only at 266 MHz. The Pentium has a 'faster' front-side bus; it'll run memory at 266MHz or 333 MHz. So buying faster memory is a 'waste'.
The memory in the link I supplied has a CAS latency of 2, which is a *little* faster than RAM with a CAS latency of 2. 5. 1/2000000000
Latency is the time it takes for the data to be presented to the system. A lower number is better; it yields a marginal difference that you might or might not notice. But since the price is the same and it can't hurt, you might as well go for the tCAS=2 RAM.
[Warning! Digression follows! (But is related to 'slow' computers. )]
I was going to say you should toss that computer and get a new one, like the dual-core Athlon Dell in today's Parade magazine for $450. That's a price you almost can't afford to pass up. But $100 for more memory is still cheaper, provided the computer still does what you need. Shoot, until last year, an 866 MHz PIII with 512MB RAM handled all my needs (email, browsing, printing, typesetting, image manipulation, et al). But I now have a quad 2GHz Opteron system; it has room to grow into.
And again, if you have Norton or McAfee installed, delete them, then find the instructions on the internet to completely remove them. They market paranoia. They get in and check EVERYTHING that goes into and out of your computer, which is why a dual-core 2GHz CPU will be no faster than a 400MHz PIII. Then install Spybot (and its Teatimer realtime registry protector), Trend Micro or AVG anti virus, and the free ZoneAlarm firewall. These plus care and common sense will prevent most 'damage' to your computer.
If you have kids using the computer, find a good ad blocker. I've never investigated them, so I'm of no use there. Maybe someone else reading this thread has some suggestions. But, I *can* say that kids do not need to be exposed to all the flash and hype of Madison Ave. and their ilk. Kids don't know and won't remember that they shouldn't click pretty links, or click links that promise them free stuff. Middle-schoolers and many high-schoolers are too easily distracted by racy pictures of the opposite sex and pictures of racy cars and motorbikes (the 'sensuous' stuff), when they should be concentrating on research.
If you teach them only to go to sites they (and you) 'know and trust' and remove the temptation by blocking the flashy stuff, your computer will stay cleaner a whole lot longer. Give them a 'restricted' login that has the ad blocker installed, and leave the ad blocker off your login. I learned long ago to not see ads unless I'm researching a product purchase, in which case I might visit sites related to that product.