Dark_Angel said:
Typically, at least at the moment AMD rules the roost. Their CPU's (apart from dual cores) are cheaper than the intel equivelent, and faster.
An Athlon 64 Venice 3000 can be overclocked to around 2.8GHZ if you are lucky, from its 1.8GHZ default... this is almost FX55 speeds from a £100 chip
This does irrate me slightly as the equivalent AMD X2s are quite a bit cheaper than the Intel P-Ds:
Intel P-D 820: £164.44 (2.8GHz, 1MB cache)
Intel P-D 920: £182.07 (2.8GHz, 2MB cache)
AMD X2 3800+: £214.97 (2xA64 3200+, equivalent to a P-D 3.2GHz)
Intel P-D 830: £223.19 (3.0GHz, 1MB cache)
Intel P-D 930: £240.82 (3.0GHz, 2MB cache)
AMD X2 4200+: £258.44 (2xA64 3500+, equivalent to a P-D 3.5GHz)
Intel P-D 940: £323.07 (3.2GHz, 2MB cache)
AMD X2 4400+: £334.82 (2xA64 3700+, equivalent to a P-D 3.7GHz)
AMD X2 4600+: £387.69 (2xA64 3800+, equivalent to a P-D 3.8GHz)
AMD X2 4800+: £458.19 (2xA64 4000+, equivalent to a P-D 4.0GHz)
Intel P-D 950: £469.94 (3.4GHz, 2MB cache)
Intel P-D 840 EE: £693.19 (3.2GHz, 1MB cache, HT Tech)
AMD FX60: £728.44 (2xA64 FX55, equivalent to a P-D 4.3GHz)
Intel P-D 955 EE: £763.69 (3.46GHz, 2MB cache, HT Tech)
AMD CPUs can do more work per clock cycle than Intel CPUs. This is down to the fundemental design of the chip itself. Intel CPUs have long pipelines (more clock cycles for an instruction) and AMD CPUs have short pipelines (fewer clock cycles for an instruction). The main advantage of long pipelines is that it is far easier to get high clock speeds out of the chip
Officially, the AMD PR system is for comparison to the old Athlon Thunderbird chips of 6 years ago. It can basically be compared to an Intel chip with a clock speed in MHz that matches the PR number. That is, an A64 3000+ can be compared to a P4 3.0GHz.
There are a few differences between the two in which jobs different CPUs are best at. For single core chips, AMD are far better at games and photoshop work (the A64, not the AXP as this wasn't that good at this task). Intel chips are far better at encoding and music work.
With the advent of dual core chips the tables turned. The original Intel dual core chips, the 800 series, were just a bodge job and it showed. The fastest Intel dual core chip was consistently outperformed (even in Intel strongholds like encoding) by the cheapest AMD dual core chip. The chip is an embarrassment and best avoided. The 900 series are a world ahead - not quite beating the AMD dual core chips but at least keeping up with them.
At the moment AMD holds the performance crown in both single core chips (FX57) and dual core (FX60).
Intel has some very nice chips due within the next few months though. They are following AMDs approach of doing more per clock cycle against continually increasing clock cycles.