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Any adavantage in fan blowing against the back of your Mobo - Page 2

post #11 of 17
I can't see where it would pull air "from" so as to cool anything. Once you put the side panel on, it would be butted right up next to it, no?
post #12 of 17
Not a well known fact,but it can make a huge difference in overclocking on some systems.Not for the CPU necassarily,but for the VRM's.Alot of heat from the VRM's is dissapated through the PCB,not just the heatsinks.I you feel the air right behind the backside of them you will see.This is not going to matter at stock clocks.By keeping the VRM's cooler you can potentially keep the power stable at higher rates.
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post #13 of 17
Quote:
Originally Posted by hooah212002 View Post
I can't see where it would pull air "from" so as to cool anything. Once you put the side panel on, it would be butted right up next to it, no?
There are holes on the side panel where the air gets pulled from. At least there was on the CM690 don't see why any company would not do this.
   
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post #14 of 17
I was messing around with different temperature monitoring software earlier and noticed TMPIN0 while using CPUID Hardware Monitor. Quick Googling showed that it's the sensor for the CPU's socket temperature. At low CPU load this socket's temp is 13-15C warmer than the CPU, according to TMPIN0.

I'd be curious to know if there's a difference in that reading if you use an app that monitors socket temps.
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post #15 of 17
Quote:
Originally Posted by Gin View Post
I was messing around with different temperature monitoring software earlier and noticed TMPIN0 while using CPUID Hardware Monitor. Quick Googling showed that it's the sensor for the CPU's socket temperature. At low CPU load this socket's temp is 13-15C warmer than the CPU, according to TMPIN0.

I'd be curious to know if there's a difference in that reading if you use an app that monitors socket temps.
All the more reason to have a fan behined the motherboard haha. But seriously I wouldnt worry, when you think about not only is the cpu sitting there heating up the board but also all the power running to socket,mosfets,vrm etc around the socket itself. Apparently while using HM my board is also a few degrees higher than my core too.
post #16 of 17
Quote:
Originally Posted by Fletcher Carnaby View Post
I ran a backside fan when I had my CM690. It seemed to drop proc temps by 1-2C.

+1. I use the CM690II aswell, lots of people said it wouldnt change anything, but it did on my rig, saw a 1-2c drop off the top end temp, did not change idle temp at all.
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post #17 of 17
I remember an old thread where a guy actually tested the temps before and after and he was suprised by the fact that the CPU load temp dropped with 5C if i remember right. Even if it drops with 1 or 2C it's still good, after all that's the average drop in temps when you add a secound fan on the cooler.

PS: it will also depend on CFM ofc, if i remember right the guy i'm talking about tested the fan at different speeds, the highest gave him -4 or 5 C but he said it was very loud...
Edited by Pentdragon - 8/22/11 at 11:34pm
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