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cooling efficiency with great tim application. - Page 2

post #11 of 12
Quote:
Originally Posted by phal View Post

You are right that a warmer heat sink would transfer more heat to the surrounding air. But the point is that the heat sink surface temperature does not depend on TIM application.

Look at it this way: The CPU creates the same amount of heat in both cases, say x Watts. So once an equilibrium is reached (where temps are more or less constant), the total amount of heat transferred to the surrounding air must be equal to that amount x of heat generated by the CPU. The temperature rise of the air traveling through the heat sink is approximately proportional to the amount of heat, which in both cases is the same, so the air temperatures will be the same after passing through the fins.

While that's mostly correct in practice, in theory there is also thermal radiation. So there is some amount of heat that is dissipated independently form the air flow and the hotter the radiating object the more significat the portion of radiated heat becomes. I can't say how significant that portion is in relation to the heat carried away by the air but its there none the less
    
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generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
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ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
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Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
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post #12 of 12
Haha, the "-" was to signify a new line, not a negative temperature!

Although I do occasionally take my system outside in the winter for benching runs!
   
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CPUMotherboardGraphicsGraphics
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EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 16GB G.Skill Ripjaws-Z @ DDR3-2248 9-10-9-26 1T Samsung 830 256GB SSD WD10EZEX 1TB HDD 
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WD10EALX 1TB HDD Seagate Barracuda 7200.14 1TB WD3200AAKS 320GB HDD WD5000HHTZ 10krpm 500GB VelociRaptor 
Optical DriveCoolingCoolingCooling
LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
CoolingCoolingCoolingOS
4x Koolance 120x25mm 2600rpm Fans Comp/Rotary Fittings (BP/XSPC/Monsoon) Primoflex Pro LRT - White (1/2x3/4) Windows 7 Professional 64bit  
MonitorMonitorMonitorMonitor
Dell P2210Hb 21.5" 1920x1080p Viewsonic VA2012WB 20.1" LCD 1680x1050 Dell U3014 Eizo 27" 1440p 10bit RGB-LED Backlit AH-IPS Panel 
MonitorKeyboardPowerCase
55" LG HDTV (their top 2014 model) Ducky Mechanical (Browns) NZXT HALE90 850W + 8 blown-up AX1200/i's NZXT Switch 810 (White) 
MouseMouse PadAudioAudio
R.A.T.3 + MX510 My Desk GRADO RS1i Headphones Grado PS1000 Headphones 
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Bitfenix Hydra Pro Fan Controller 5ch 30W/ch Bitfenix Alchemy Individually-Sleeved Extension... NZXT Individually-Sleeved Front Panel Wires (Bl... Phobya Sleeved 1x3pin-to-4x3pin Fan Splitter 
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Sleeved Wires w Paracord myself (no Heatshrink) Custom Front and Top Panels w HexxMesh *In Prog... Working on Custom Pedestal Prototype 
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