I have owned my Hiper Type-R 580W PSU for at least two years now (mfg date of June 2005) and recently the voltages have been horrible. For example, the +5 is ~4.50 and the +12 is 10.98-11.10. I purchased this unit off of a member of this forum so I do not have the original proof of purchase/sales receipt. I did email Hiper's RMA support line and was told that it isn't needed and to just send the unit in after I fill out the RMA form, which I completed today. I never heard of a company accepting a RMA request without proof of purchase, but I also don't have much to lose other than shipping expense. Any opinions on the subject? The PSU does have the mfg. date on the warranty sticker on the side of the PSU so perhaps that is why it isn't needed?