windhero
Posts: 34
Joined: Fri Aug 03, 2012 9:56 am

XBian Overclocking and cooling

Thu Aug 23, 2012 2:34 pm

As some of you probably know already, there is a light-weight version of XBMC for the Pi called XBian (http://xbian.org/) and it overclocks the Pi by default to arm_freq=840 and core_freq=375 (default being arm_freq=700 , core_freq=250). Now I was wondering, does this shorten the lifespan of the Raspberry Pi significantly without ventilation? I have no ways to measure the actual temperatures and I've never overclocked anything on my own, so Im fairly new to this.

I was thinking of buying a 30mm case-fan and soldering it into a USB-wire, so I could plug it into an USB-hub when playing XBian for extended periods of time. I'll be getting a Pibow case in the near future, so there is no way to make this a permanent solution (I'll just have to put the fan on top of the ventilation holes).
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Tl;Dr arm_freq=700 , core_freq=250 > arm_freq=840 , core_freq=375 - Is cooling necessary?


dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5288
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Location: Cambridge

Re: XBian Overclocking and cooling

Thu Aug 23, 2012 2:55 pm

Honestly, there is no reason to add a fan.

windhero
Posts: 34
Joined: Fri Aug 03, 2012 9:56 am

Re: XBian Overclocking and cooling

Thu Aug 23, 2012 3:05 pm

dom wrote:Honestly, there is no reason to add a fan.
Does this mean cooling in general or just not a fan? Because I don't think I can fit heatsinks in the case, so a fan through ventilation holes was my alternative.

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5288
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: XBian Overclocking and cooling

Thu Aug 23, 2012 3:11 pm

windhero wrote:
dom wrote:Honestly, there is no reason to add a fan.
Does this mean cooling in general or just not a fan? Because I don't think I can fit heatsinks in the case, so a fan through ventilation holes was my alternative.
There's no evidence that the SoC overheats with or without overclock (or overvoltage).
Basically if you can touch it without getting blisters (and you will be able to), it is fine.

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RaTTuS
Posts: 10381
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Location: North West UK

Re: XBian Overclocking and cooling

Thu Aug 23, 2012 3:23 pm

any distro that overvolts [and thus destroying your warranty ]
should have BIG flashing neon red lights round the site

but to answer you question
no - no need to put heat syncs on - well you can but no real need.
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windhero
Posts: 34
Joined: Fri Aug 03, 2012 9:56 am

Re: XBian Overclocking and cooling

Thu Aug 23, 2012 7:35 pm

Great, that's what I wanted to hear. You just saved the world from some waste of tin, lead and most likely loads of duct tape, because I'm really bad at soldering ;)

v1ncen7
Posts: 3
Joined: Fri Nov 09, 2012 5:20 pm

Re: XBian Overclocking and cooling

Fri Nov 09, 2012 5:27 pm

Got my Pi running Xbian 1.0, with the following settings - !!This VOIDS the warranty!!

arm_freq=1100
core_freq=500
gpu_freq=500
gpu_mem_512=384
sdram_freq=550
over_voltage=6
photo2.jpg
photo2.jpg (50.66 KiB) Viewed 4401 times
Seems to be stable so far under 42 degrees while playing 1080p vids.

notarat
Posts: 106
Joined: Wed Sep 12, 2012 12:32 pm

Re: XBian Overclocking and cooling

Fri Nov 09, 2012 9:39 pm

RaTTuS wrote:any distro that overvolts [and thus destroying your warranty ]
should have BIG flashing neon red lights round the site

but to answer you question
no - no need to put heat syncs on - well you can but no real need.
Well then, it's a good thing I run Xbian since it doesn't overvolt my Pi.

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