Overclocking and Power Supply

[Raspiberry]

Hello everyone:
I feel the urge to overclock , and before doing so I'd like to ask a few questions:
First off, for any overclockers of the Pi--how much of a temperature increase did your Pi gain? Does anyone happen to know the normal idle temp of a 700MHZ (default) Broadcom chip?

Also, I'm using the Nook 1st Generation Power Supply. The headroom of the overclock is affected by the efficiency of the overclock, and I was wondering if I should switch over to my Kindle 1st Generation charger. It shouldn't matter, but, I'd like to give my Pi the cleanest energy during the energy conversion .
Thanks everyone (and, should I just enable Turbo (1GHZ) if my setup allows it, or just simply use a more modest overclock?).

[dom]

As long as you backup first (or start with a new image), then just try it.
You won't cause any damage (it might crash and could corrupt sdcard if you are unlucky). If it does then try again with a lower overclock setting.
Running penguinspuzzle, quake or xbmc are good "stress" tests for power supply.

[Raspiberry]

Well, I tried after wrestling myself to finally do it.\
I tried the 1000 MHZ "Turbo" setting, and it worked great--at first...

It rebooted when I ran Minecraft - Pi Edition.

Then, I tried the "High" option, 950 mhz, and it rebooted--not after Minecraft - Pi Edition (ran for 10 minutes), but after running Quake 3.

So, I guess I'll h ave to settle with the medium overclock...unless...

I run the Pi with a Kindle First Generation Charger (the one Eben uses I believe), but run it off a power strip that is connected to my home media centre (3D Blu-ray Player, Samsung television, Wii System, and many other things). With such a setup, could the Pi have issues drawing a stable supply of power that works well with it? If so, I can easily move it to plug it into the wall outlet.

Thanks!

[pluggy]

Overclocking the Pi, is like overclocking anything, your mileage will vary on the individual chip. My broadcom chip idles at around 40C with ambient around 20. I don't see it much above 60C but I don't make a habit of working my Pis hard. They are good up to 85C, but you're going to need to put it in a small airtight box and run quake in the middle of the Sahara on a hot day to see it. I have the raspi-config overclocking active on all 3 of mine, 1 will run OK at 1Ghz. The others I keep at 800. Your power supply has to be on the edge of working before it becomes an issue. The Pi uses little juice to start with and most it isn't the Broadcom SOC (The LAN chip is the greediest bit). If you've got > 4.8 volts across the test points, the power isn't likely to be an issue, overclocking or not.

[Mobius]

The problem with the power supply is that the polyfuse will drop more voltage as the current demand increases because it has an internal resistance. So, the more you overclock or the more peripherals added, the more current drawn. Try monitoring the voltage across TP1 and TP2 while stress testing the Pi. I finally added a glass fuse inline with my power input and shorted across the polyfuse. Now I can drive all sorts of peripherals and hold a steady 4.94 volts. If you are concerned about the heat dissipation of the chip, you can buy a small heatsink that sticks to the top of the chip.

[Wheel_nut]

It rebooted when I ran Minecraft - Pi Edition.

Dare I ask where you got Minecraft - Pi Edition from? is it now available for download?

[Raspiberry]

Overclocking the Pi, is like overclocking anything, your mileage will vary on the individual chip. My broadcom chip idles at around 40C with ambient around 20. I don't see it much above 60C but I don't make a habit of working my Pis hard. They are good up to 85C, but you're going to need to put it in a small airtight box and run quake in the middle of the Sahara on a hot day to see it. I have the raspi-config overclocking active on all 3 of mine, 1 will run OK at 1Ghz. The others I keep at 800. Your power supply has to be on the edge of working before it becomes an issue. The Pi uses little juice to start with and most it isn't the Broadcom SOC (The LAN chip is the greediest bit). If you've got > 4.8 volts across the test points, the power isn't likely to be an issue, overclocking or not.

I believe it's my power supply because I couldn't even reach the "High" overclock option.


Also, the Minecraft - Pi Edition is in the "Game" forum. It should be one of the first few threads on the first page, given the attention it gets.