PC/AT overclocking

On 12 Nov 2006 at 1:24, Jim Leonard wrote: Under a compute-bound load, many seem to think it's pretty close to 5x. For example, see: http://www.pcguide.com/ref/cpu/arch/perfSpecifics-c.html http://www.ultratechnology.com/bench.htm I'm not quoting the Dhrystone benchmark results here, because while the sampling is large, there's just too much of an apples-and-oranges feel about the results. I wish I could find some early iCOMP results for the 8088 and 286. I submit the proposition that the relative improvement in performance between any two consecutive IBM PC models never exceeded that obtained between the 5160 and the 5170. I recall running some very compute-heavy benchmarks from an 8 MHz 8088 and being startled by how much faster they ran on a 6 MHz 80286. I believe that benchmarks tend to have a first-cousin relationship to unvarnished mendacity, but given the combination of faster I/O and processing speed, I think an 8 MHz 5170 comes very close to being almost 5 times as fast as a 4.77 MHz 5160. Perhaps one of the list members can verify this. I've got XT and AT "clones", but that might not give an accurate reflection of performance on IBM hardware. Cheers, Chuck