80 is still within acceptable limits of course, so you still don't need the heatsinks.Hayden_James wrote:I'm over clocked and over volted but without heak sinks AND fan, temps were close to 80c constantly (in a closed Cyntech case!)
Now with sink + fan runs around 50c.
One important point many miss is that heat sinks in closed top cases without fan is pointless, because hot air is trapped. Also if you run Pi uncovered heatsinks are also pointless because running without a case or a convertable case will be cool enough without heat sink/fan.
So bottom line is you can overclock and overvolt up to the range of raspi-config's max overclocking setting using the default "uncovered" setup. But buy an aftermarket case with little ventilation and that changes!!
I have a fully closed Cyntech case for the pi above and I had to run with the top cover off until my sinks and fan arrived.
It depends who you ask and what you hope to achieve.berighteous wrote:So the answer is still NO no matter how you run the pi, especially if it's not in a closed case?
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Don't forget that not everyone has an ambient temperature as low as we're fortunate enough to have here in the UK. In a bog-standard Pibow case, mine would definitely be throttling back if room temperature rose above 30°C when 'Turbo' overclocked and pushed hard, even with a small heatsink. As similar temperatures have been reported by others, I've no reason to assume that mine is the exception to the rule.jamesh wrote:Actually, it almost certainly does still apply. Has anyone actually seen throttling happening? I have seen quotes of temps, in enclosed cases, get in to the 80's but not had any evidence of throttling.
Well, mine was reaching a maximum of 83.7°C when gaming last week with a room temperature of only 20°C. The answer was to throw the Pibow case in the bin and run bare for a while. That lowered peak temps to a more sane 74.5°C which I could live with if I had to. If it's like this with a room temp of just 20°C, what's it going to be like if that's raised to 30 or 40°C?Jessie wrote:I think it would be hard to get a Pi to the throttle point. Mine runs at 950Mhz all day long and never even gets close. I would venture to say that on in an enclosure in the 108F sun and overclocked would a Pi hit its thermal limits under normal circumstances.
looks like my phenom II 965's stock hsf, which BTW will run at 4.2GHz with 1.5 vcore (that is about 200W)FatalError wrote:I was thinking that how much you can overclock (AND of course overvolt) RPi until it breaks/becomes really unstable if cooling is not a problem
I once overclocked my Samsung Galaxy S Plus from 1,4GHz to 2,016GHz, it was unstable but 1,996GHz was stable WITHOUT any overvolting!
(AMD FX-8320 stock cooler)
I agree with that, except possibly in some of the much hotter countries where the Pi might be sold.Jessie wrote:As long as its not overclocked I think "no heatsinks required" always applys.
I understand that they're not guaranteed, but they are provided, therefore, effectively approved by the foundation with encouragement to use them in the form of easy setup via raspi-config. Maybe a little extra needs adding to the standard raspi-config overclocking warning message regarding possible erratic but non-damaging performance behaviour without adequate ventilation and/or in warm environments?Overclocks are never gauranteed.
Industrial use is an entirely different matter as it's not something that falls within the intended design purposes of the Pi. As the Pi's primary purpose is education, isn't it better to assume that the end-user doesn't know about potential performance issues when overclocking in hot conditions? I'd imagine that this will be the vast majority of people's first ever experience of overclocking, so it's not sensible to assume that they have any prior knowledge.I can see your point about overclocking on a hot day but I'm not sure anyone using this thing out in the sun or in an industrial environment would ever overclock.
If price is of no concern then I doubt they'll be using a Pi for such applications anyway.I've installed industrial computers in the boiler building of a powerhouse where the temp is between 35 to 40C in the building and never once have they asked "hey can you OC this thing" or "does it run crisis?" Price is no concern for them and uptime is paramount.
As overclocking is only a few clicks away via raspi-config where any end-user can get to it, surely it has to be included in 'intended use cases'. You and I are both lucky enough to live in first-world countries where ambient temperatures are either within comfortable limits, or we have the means to ensure that they are. Over 85% of the world's population live in developing countries where they may not have the luxury of doing so, and many of those countries have significantly higher ambient temperatures than we do.The only time I see (maybe I am shortsighted) users overclocking a Pi is the enthusiast case and most of the time in a home. If my home gets to 30C (86F) and the cooler goes out I'm getting a hotel room. Again this is my opinion not anything scientific but I bet "no heatsinks required" covers 98% of use cases and 100% of its intended use cases.
If the Pi inside the arcade cabinet is running a 'Turbo' overclock, this would provide interesting comparative information. Assuming that the cabinet is enclosed, the air inside may behave more like a heat soak than a heat sink after an extended period of time, so it may take several hours to see maximum temperatures depending on the size of the cabinet.I should see how hot my Pi runs in my arcade cab, most of mine are in the open.
Nope. I have a model B with 256 running OpenELEC. Not used all the time, but on all the time. No heatsink, no problems...the H264 etc decode is pretty energy efficient, so is unlikely to get the chip up the temps seen when doing 3D.DominusPi wrote:I was actually thinking of using an old little heat sink from some electronics I put it constantly on the 3.3v pin.
I don't believe I need it, as I use it for xmbc right now, but because it is overclocked and on for hours or days, it can only be beneficial .. right ?