Basically there is 2 point with memory : how much you want to spend and how fast will you run your module.
The "how much" question depends on everyone's budget, but the "how fast" is more tricky!
Of course, if you buy XL @ 2-2-2-5 would be surely faster than 3-4-4-8 memory module. But, what we have to know is that on AMD64 platform 2-2-2-10 is actually faster than 2-2-2-5.
What I really like about the OCZ EB series is that they figured out a way to improved memory bandwidth by tweaking the timing. So, their 2.5-3-2-8 SPD timing might not look very impressive compare to 2-2-2-5, but these timing are FAST.
Have you read all the AnandTech article about the OCZ EB modules? They conclude that P4 best perf. are achieved with 2.5-3-2-5 timing and 2.5-3-2-10 on AMD64 platform. And they do not only test these module at overclocked speed. There is a lof of graph at default speed. And the OCZ 3500EB modules are the top performer at DDR400, DDR433, DDR466 and DDR500 speed. It's very impressive.
This mean that these DDR433 rated modules outperforms DDR500 modules. Their only weakness is their highest speed, about DDR510, other modules achieve DDR550 and more.
But, DDR500 is more than enough for AMD64 overclocking. With all these facts gathered I have OCZ 3500EB modules on my wish list for my next system upgrade.
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What's the <b><font color=green>AMD Mobile Athlon 64</font color=green></b> overclocking potential? <b>It's huge!</b> Humm... Maybe not that huge...