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PentiumⅢ和PentiumⅡ最主要的不同在于增加了KNI指令集(又称为SSE或MMX2),并且全面改用了SECC2的新包装。在L2 Cache的设计方面,仍然与PentiumⅡ一样内建512K L2 Cache于CPU电路板上,且L2 Cache的工作时钟频率只有CPU核心的1/2。 PentiumⅢ超频受L2 Cache限制,PentiumⅡ或PentiumⅢ可以超多少,跟它所采用的L2 Cache速度有很大的关系。以早期的Pentium Ⅱ300来说,L2Cache的速度只需要6ns(166MHz)就可以胜任了,但以目前PentiumⅢ450来说,L2 Cache工作时钟频率为450/2=225,L2 Cache至少必须是4ns,所以仔细看看PentiumⅢ上面的L2 Cache规格,可以清楚地看到4ns(250MHz)。 由于L2 Cache与PentiumⅢ内核速度的同步关系,因此超PentiumⅢ其实就是超L2 Cache,虽然也有超频的空间,但是并不大。以PentiumⅢ450(4ns L2 Cache)来说,从规格上来看,超到500MHz正好符合内存的规格,实际的情况是,大约超到124×4.5=558就差不多了,到了129×4.5=580可能呈现有时
The main difference between the Pentium III and the Pentium II is the addition of the KNI instruction set (also known as SSE or MMX2) and the full switchover to the new SECC2 package. In the design of L2 Cache, it still has the same built-in 512K L2 Cache as the Pentium II on the CPU circuit board, and the working frequency of L2 Cache is only 1/2 of the CPU core. Pentium Ⅲ overclocked by the L2 Cache limit, Pentium Ⅱ or Pentium Ⅲ can be super-less, with the L2 Cache speed it has a great relationship. In the early Pentium II 300, the speed of L2Cache only required 6ns (166MHz) can be competent, but the current Pentium Ⅲ 450, L2 Cache operating clock frequency of 450/2 = 225, L2 Cache must be at least 4ns, so carefully Look at the Pentium Ⅲ L2 Cache specifications above, you can clearly see 4ns (250MHz). Due to the synchronization between L2 Cache and Pentium III core speed, Ultra Pentium III is actually an ultra-L2 Cache. Although there is space for overclocking, it is not large. To Pentium Ⅲ 450 (4ns L2 Cache), from the specifications point of view, up to 500MHz just in line with the memory specifications, the actual situation is that about over to 124 × 4.5 = 558 is almost the same, to 129 × 4.5 = 580 may appear sometimes