Which Crucial Ballistix for Neo2; PC3200 or PC4000?

I've read the sticky at the top of the forum regarding memory that works well but this is about choosing between a shortlist of 2.
I'm going for Crucial Ballistix, 2 sticks of 512MB.
The choice is PC3200 which is rated at 2-2-2-6 or PC4000 rated at 2.5-4-4-8.
Price is almost identical - the PC4000 is £1 more per stick.
Baiscally I have absolutely no idea what the numbers mean so can someone give me the short answer please?
PC3200 or PC4000?
P.S. If it makes any difference, I'm not into overclocking.
Edit: This will be used on a Neo2 and AMD 64 3000+

Quote
Originally posted by mrpiercer
To take a real life example;  I use Kingston memories which are marked CAS2, and I run them at CAS2.  With memory speed at 200MHz, I reach a bandwidth of 5998MB/s.
That's fast and cheap. Without overclocking, speed is 200MHz  
Quote
Originally posted by mrpiercer
With Kingston CAS3 memories at 250MHz, I reach 6012MB/s.
That's overclocked, total memory speed is 2 x 250MHz (500MHz opposed to default 2 x 200 = 400MHz)
BUT the modules has a lower CAS speed (3 opposed to 2), therefor the flow of data between the CPU and memory isn't much faster than the first example. 6012MB per second opposed to the default 5998MB per second.
That small difference (14MB per second) could very well also be due to temperatures, voltages, your dog eating, your neighbour washing his car...  In other words, neglectible.
So, to have some real performance gain with overclocking you need fast memories (CAS2), high clock speeds, and lots of luck. (And a well filled wallet, since those memory modules tends to be really expensive.)
Did that do it any clearer?
Anders.

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