Imac I7 2009 fan noise and vibration

I just got a refurbished imac 27 2009 i7, with 2TB hard drive. The fans are always noticeably on. Also, the top of my desk has low level vibration from the imac. Apple is willing to give me a full refund. Will an i3 be quieter?
Thanks

Scott is correct -- this is not normal for the '09 i7 (I have one and it's very quiet). As for the i3 the speed depends on what you intend to do. The i7 is a great machine for apps that require a lot of horsepower like video encoding. If you are doing mostly web surfing and document prep the i3 is probably more than enough.

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