Yup right, vibrations on ur PSU and also, hissing kinda noises on the RAM modules...
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Not to mention, wat if ur PSU+RAM are damaged b4 u get the cash to get a new SInewave UPS ?? scary thought isin't it ??
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I myself hv ordered a APC SMART UPS (model: SUA 1500 I) wich costed me a bomb at around 15K jus for the UPS..
but yes, i dnt wanna take any chances, not even for 1 day wen my system is Working to its full potential, hence tat extra load of 15K on me..
but i knw its worth the money..
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So, my advice, DO NOT take any chances dear brother..