What is FSB and how does it affect performance of both?
The front side bus is the communication bus of the CPU. The Athlon64 doesn't even a front side bus in the traditional sense, so it's hard to compare. It does however have speedy HyperTransport links at 1GHz in each direction.
What is cache and what affect does it have on the performance of the cpu?
Cache is a small memory located close to the CPU, with extremely low latancy and very high bandwidth. It's used to temporarily store data that the CPU works with to make access faster. Different architectures respond differently to cache sizes. More is better, but it can't be used to tell anything meaningful when comparing two different CPUs at a glance. For example, Intel had to put 1MB cache on the Prescott CPUs just to maintain approximately the same performance as the older Nortwood with half the cache!
Why is the clock speed different but they are still comparable(PR rating)?
As said before: IPC (instructions per cycle). For some reason, clock frequency has always been the measure of performance to the average person. The performance of a chip is, however, not even remotely dependant on just that single variable. For example, a modern CPU reads chunks of instructions and executes them in parallell over several execution units. The amount of execution units, the design of the pipeline, cache access latency and branch prediction efficiency are just some of the variables that determine how much work a CPU can complete each cycle. Since the amount of work that can be done each cycle (IPC) varies greatly between different designs (like P4 versus Athlon), comparing clock frequency is actually completely misleading. The only time where clock frequency can successfully be used to compare is when comparing CPUs with the exact same core.
Which Processor is better for overclocking?
Can't really be generalised. They're both pretty equal.
Which processor is better for gaming?
Athlon64. Without doubt.
Which processor has the best Performance/price ratio?
Well, since they're good at different things, one must first read up on tests to see which CPU that's best at the tasks one usually perform. The A64 is better at gaming and P4 is better at video encoding. The rest of the stuff is pretty spread, although it's my understanding (after having read most tests at the large hardware sites) that the A64 can be considered a better overall performer in most cases. It should be noted that Hyperthreading can make the P4 more responsive if one tends to use several demanding applications at once.
Which processor is all out better?
For me it would be the Athlon. It's got all the things I want. It's faster in games, compiling, archiving, modelling and scientific calculations. Additionally it produces much less heat than the P4, so it's easier to make an A64 quiet (which is something I greatly appreciate). Since I don't do any heavy multitasking or encode video, I'd say that it pretty much makes zero sense for me to buy a P4. Plus that the A64 generally is somewhat less expensive.
Which Processor BRAND (AMD or INTEL) do you have in your computer?
AMD. I used to be an all Intel guy and refused to go AMD. For some reason I eventually tried it out and I've been happy ever since. These AMD computers that I've owned myself and built for my friends have been amazingly (100%) stable and I couldn't be happier with these products.
Which do you prefer?
I guess it's pretty obvious from the above text that I prefer AMD at the moment. That might change again in the future, but by the looks of it, I'll stick to AMD until Intel ditches the Netburst (P4) architecture.
Whats the different between 32 Bit Processing and 64 bit?
There's a quite big difference in some things (like 30-200% faster) and much smaller in others. The software support is limited at the moment, atleast on the Windows side of things. WindowsXP-64 is just around the bend, though, and judging by the preliminary testing done so far, we're going to see some nice performance increases in a number of things.
I hope this post was helpful! Be sure to check out reviews of CPUs at sites like Anandtech.com and Xbitlabs.com.