I'm taking the choice of answering the questions you'Re asking big b because I read the post and now the answers but you could wait for big b to answer if you want, anyways, here's what I have to say.
basically, latency is a waiting state between data transfers, just like the lag when you play games on the net, lag is another word for latency, so lower latency means faster memory. the memory you are looking at has a latency of 2, the one which is supported a latency of 2.5 .
I checked the website, they have a bios update, the say they support faster cpus and refers you to a link where you can check the supported list. But the list stops at the 2800+ and does not include cpus supported by the newer bios so I cannot tell you whether the 3000+ is supported or not.
L2 cache is the ram inside the cpu, it is extremely fast(if the cpu runs at 2.5 ghz, the cache will run at 2.5ghz, compared to ddr400 which runs at 400mhz), much faster than any type of ram and much more expensive, that'S why there is only 512kb compared to the 512mb you're looking to buy. you cannot buy L2 cache, it comes with the cpu, xp cpus have 256kb of cache but the new 3000+ will have 512kb of cache. SRAM has been there for a long time, at least 10 years, but on the 486 dx/4 100s(the intel ones, amd had less cache) there was only 16kb of cache, now the max is 512kb.
sdram has 172 pin compared to 184 for ddr, the maximum speed of sdram is 133mhz, the minimum speed of ddr ram is 200mhz, but you are buying 400mhz ddr ram(ddr400). but even at the same clock(if it existed) ddr would be faster because of the number of pins.
