Acer Aspire 5251 Service Guide - Page 25

CPU Fan True Value Table (Tj = 100 UMA) CPU Temp (°C) Core 0 Fan Speed (rpm) 50 2500 56 2900 63 3200 70 3600 80 4000 95 4000 SPL Spec (dBA) 28 31 34 37 40 40 • Throttling 50%: On=95°C, Off=85°C • OS Shutdown: 100°C • H/W Shutdown: 92°C Fan Acoustic Specifications Operation Mode Application SPL dBA Fan off Windows Idle (HDD random N/A seek) Fan 1 Windows Idle 28 Fan 2 Windows Idle, HDD spinning 31 Fan 3 Play Movie (read from HDD), 34 Play TV (TV tuner sku) Fan 4 3DMark06,Prime95, 37 Prime95+Play TV(TV tuner sku), acer screen saver, HDD spinning Fan 5 TAT100% or 40 Thermanow100%,3DMark06, at ambient 35C, HDD spinning ODD ODM's test software 43 (Reference) (Sequential) with Fan 4 Loudness (Sone) • 20~3.99kHz less than or equal to: 0.035 • 4K~20kHz less than or equal to: 0.035 N/A N/A N/A Tone (dB) 7 7 7 7 N/A 7 N/A 7 N/A N/A NOTE: Tone:20~399Hz refers to slope of Ecma-074, 400~20K Hz < 7 Prominence ratio. No pattern occurred on Prominence vs. time diagram. Chapter 1 15