Seems there's quite a few mis-informed people here, let me lighten things up (that sounds arrogant, but bear with me please).
mpjesse - not to insult you, but when you said "4 Pipeline 200MHz FSB", that's no where near right. What it is is Intel's Front Side Bus sends 200MHz 4 times per clock cycle (also referred to as Quad Pumped) because it uses 4 sides of the Square Wave (I don't know alot about the Square Wave, but I know how it's used). AMD on the other hand, sends 200MHz 5 times per clock cycle, it would appear that either the Square Wave has to have 5 sides or more, or something else is happening (I don't know what).
For the "2GHz AMD FSB", what it really is is 1GHz Full Duplex or Dual Channel. It sends 200MHz x5 both ways (Sending and Receiving from the CPU to NorthBridge) at the same time, thus producing a 2GHz effective system speed. Whereas Intel has 200MHz x4 1 time and cannot send/receive at the same time. Also HyperTransport (AMD's FSB) uses 64-Bit Packets (Nothing to do with 32/64-bit computing) and Intel's FSB uses 3 parts of Command/Data/Address whereas HyperTransport combines those into it's 64-bit packets. (Also makes HyperTransport take longer to send the packet which would explain why 1GHz AMD FSB !> 800MHz FSB on Intel)
For Caches, Intel needs to be bumping up that L1 Cache, that is the most important cache in a CPU (basically it determines what the CPU is to process and the order in which to process it in). But Intel hasn't realized that more L2 Cache is a no-no. More L2 Cache, theoretically, means faster CPU, but when you're already as inefficient as Intel and you have a pipeline of 31 (the fastest Presscott) whereas AMD has pipeline of 10 (fastest FX, and most Athlon 64's if not all), you have no chance.
And to clarify it, GHz is nothing. I myself, yes, use AMD, but because I spent years researching and learning physically how both architectures work, and come to the conclusion that AMD is more efficient and faster. Intel relies on MHz to sell, since their marketers for one, demanded they do it, and because AMD was creeping on them.
One thing I have come to find, is that the Onboard Memory Controller also has it's cons. Such as for Bus Mastering. Bus Mastering (For those who do not know) is loading data directly from Hard Drive into RAM w/o CPU intervention, it appears though that for an AMD CPU, the CPU must reserve a few clock cycles and would almost eliminate Bus Mastering all together (I may be wrong, if I am, please inform me). So Intel would have an edge on AMD in loading times, but with HyperTransport, that would almost nullify that I believe.
For those interested in the latest AMD news, AMD does have HyperTransport 2.0 which raises clock speeds to 1.4GHz x2 (2.8GHz Effective System Bus) which I hope will be implimented into M2's or Socket 1207 Opterons, that would be really nice.
For the RAM discussion, both companies (AMD/Intel) kept their system clock at 200MHz for 1:1 ratio with RAM (Intel eliminated that with DDR2, stupid move in my book). And the RAM is simply Dual Channel (Grabs from 2 sticks at 200MHz simultaeously) and both companies have Dual Channel CPU's (Though Intel is trying Quad Channel with Xeon's, going to be a disaster). That is also, I believe, the reason for the wait on M2. AMD will have 1:1 Ratio with FSB to RAM at 333MHz with DDR 2 667, whereas Intel DDR 2 platforms have 200MHz FSB to 333MHz (w/ DDR 2 667) and produces something like 16:5 RAM/FSB Ratio.
As to the topic, I believe the higher-end CPU's from AMD/Intel are higher priced because they only want enthusiasts (rich people) to be purchasing them (also because they're greedy). The reason AMD released the Opteron 254 (2.8GHz) was because they said their clients (companies) wanted faster Opteron's for their servers. I myself chose an AMD Athlon 64 3700+ San Diego and am very happy with it, overclocking to 2.8GHz stable with 250MHz FSB x4 is just fine for what I need. Hope this helped, and I didn't mean to offend anyone or sound arrogant (though nearly impossible to avoid). Some information here may be wrong, but to the best of my knowledge, it should be correct.
Peace.