possible reasons:
1. you bought a remarked CPU, could be a K6 200 you have bought and someone
remarked it and sold it to you at a 233 price!
2. your fan is not good enough or not working properly
3. your motherboard/ram isnt good enough
4. your computer is not setted up properly. could have the wrong
settings in bios or wrong voltage on the motherboards.
Solution
1. make the cpu go at 225. this would be noticebly faster than 233 whilst
making the cpu work less harder
2. take it back to the vendor. if no help change the fan or switch to
225,...