The Cyrix family of chips have traditionally been underpowered, and while they may be great for a stock iopener knock-off, I doubt it will stack up well against the k63.
Don't think so. No L2 cache. Clock speed seems to be 66MHz and the speed rating is defined in the "PR" format ie PR300-PR433. If the clock is really running at 66 MHz and the max clock multiplier is 4.0 (although the features section lists the max at 3.5x) then the real top speed is 264MHz. Not sure it is worth buying one to test unless you have another use for it. A vcore of 2.9 seems like old technology. Why is it called a 333MHz processor any way? You would need a multiplier of 5x 66MHz to get that speed.
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