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jtr1962 said:
Intel processors in general overclock better than AMD. The AMDs are usually very close to their limits even at their rated speed while Intel has a more conservative rating system.
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I'd have to disagree with you there, as the processor market stands today. I'd say the AMD's and Intel's are fairly even on overclockability. Due to heat concerns, the Northwood P4 is more easily overclocked when compared to the prescott when using air cooling only, so I took a look at some of those. One particular person bumped their 3.0 Ghz Northwood up to 3.7Ghz (using Air cooling only).
Now, an AMD '3000' Barton core (not the AMD 64 model) runs at 2.16 Ghz and would be comparable to the Pentium 4, 3 Ghz. As the AMD's do more 'work' per clock cycle, the AMD runs at ~70-71% of the Pentium 4's clock speed. Equivalently, a 700 Mhz jump for the AMD is not required to remain equal, in terms of performance. In fact, if you keep the same ratio of 70%, then the AMD only requires a 490Mhz jump. That's using the XP core, not the 64, which is a bit more efficient. (As raggie mentioned, the AMD 64 '4000' runs at 2.4Ghz)
If you stray into the more exotic methods of cooling (LN2, Dry Ice, Peltier's etc) then you see that both manufacturers remain about equal. (I've been using "VR-Zone Hardware"s overclocking databases for these numbers, by the way)
The fastest LN2 cooled AMD XP Barton Core that they have recorded, runs at 3058 Mhz. Using the same 70% ratio, a Pentium 4 would require a 2075Mhz bump up, to maintain the same performance ratio. Incidentally, the highest LN2 cooled P4 Northwood (originally at 3.2Ghz) runs at 5125 Mhz, which is slightly less than 2,075 above it's stock speed. I'm not saying one is better than the other by any means. Disregarding the Prescott "Flame-Thrower", as it has been called, I'd say the Intel and AMD's are fairly equal in terms of overclocking possibilities. Obviously I've used a fairly unscientific method for estimation, but I don't think it strays too far from reality in this case.
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