"3.00GHz" is part of the CPU's model name; "2.99 GHz" indicates the speed the processor is actually running at. Your processor is only single-core; it may or may not have HyperThreading (which fakes a second core; it performs slightly better than a straight single-core). If you had a processor with more than one core, or more than one CPU, it would directly state that.
actually, running tinyxp rev 9 on a p4 2.4ghz it starts in 31 seconds and shuts off in 13. this is actally faster than my ubuntu (9.04) based laptop (see below).
but as for my clock speeds...
skeleton box -> amd athlon 1800+ (socket A) overclocked to 1.5ghz
server 1 -> amd duron 1200+ @ 1.2ghz
server 2 -> intel p4 2.5ghz
lappy -> amd Athlon QL-60 x2 @1.9ghz/core
hey, why doesn't everyone run the linux hardware information benchmarks (included in partedmagic and puppylinux) and post the results. i will be the first. when i get home i will run the benchmarks and post them.