On 10 January 2012 05:08, Gasha <[email protected]> wrote: > Power supply maximum efficiency and optimal efficiency are two different > things. > > Most are rated as 85%+. > > However, efficiency curve is best around 40-60% load. > In some cases, that means 850W PSU is overkill, especially, if real load > will be maximum around 300W. > > We tested lot of PCs and servers with "powermeter". > Most PCs ended up with total around 100-150W (including monitor). > Typical 2 processor server (DELL 2900, 10 HDD) was 360-390W. > > Server which gets 400W+ real load produces a LOT of heat!!! > Trust me. I had such server running at home (temporary) for 2 months. > 850W PSU is overkill. 1200W also. > > Oversized/overrated PSUs are common, because cheap chinese manufacturers > give incorrect numbers. > Better get good PSU (from known source). It will cost the same money, and > will be more efficient in long term.
I agree, I've found exactly the same thing using a real power meter across many computer systems. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
