What are the overclocking capabilities?

Question

I've not ordered mine (yet!), but I do some overclocking as a hobby to the extent that my netbook, Android phone, desktop, and even my wife's Blackberry are overclocked.

Is there potential to overclock the RPi beyond stock voltage and speeds?

I figure I can rig some sort of custom cooling if need be.

Answer 1

Without overvoltage (i.e. at the default 1.2V), most Pis can run at up to 800MHz stably.

With overvoltage, 1000MHz is common.

WARNING: Setting any of the parameters which over volt your Raspberry Pi will set a permanent bit within the SOC and your warranty is void. So If you care about the warranty do not adjust voltage.

References:

• http://www.raspberrypi.org/faqs
• http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=6201
• http://www.senab.co.uk/2012/05/29/raspberry-pi-overclocking/

Answer 2

The Raspberry Pi contains a /boot/config.txt.

This file is read by the GPU before the ARM core is initialised. It can be used to set various system configuration parameters. Which can be used for overclocking.

WARNING: Setting any of the following parameters which over volt your Raspberry Pi will set a permanent bit within the SOC and your warranty is void. So If you care about the warranty do not adjust voltage.

|:---------------------|------------------------------------------------------:|
|      Option          |                                                       |
|:---------------------|------------------------------------------------------:|
| arm_freq             | frequency of ARM in MHz. Default 700.            
| gpu_freq             | Sets core_freq, h264_freq, isp_freq, v3d_freq 
|                      | together. 
| core_freq            | frequency of GPU processor core in MHz. Default 250.
| h264_freq            | frequency of hardware video block in MHz. Default 250.
| isp_freq             | frequency of image sensor pipeline block in MHz. 
|                      | Default is 250.
| v3d_freq             | frequency of 3D block in MHz. Default 250.
| sdram_freq           | frequency of SDRAM in MHz. Default 400.
| over_voltage         | ARM/GPU core voltage adjust. [-16,8] equates to 
|                      | [0.8V,1.4V] with 0.025V steps. Default 0 (1.2V) [1]
| over_voltage_sdram   | Sets over_voltage_sdram_c, over_voltage_sdram_i, 
                       | over_voltage_sdram_p together
| over_voltage_sdram_c | SDRAM controller voltage adjust. [-16,8] equates to  
|                      | [0.8V,1.4V] with 0.025V steps. Default 0 (1.2V) [1]
| over_voltage_sdram_i | SDRAM I/O voltage adjust. [-16,8] equates to 
|                      | [0.8V,1.4V] with 0.025V steps. Default 0 (1.2V)[1]
| over_voltage_sdram_p | SDRAM phy voltage adjust. [-16,8] equates to 
|                      | [0.8V,1.4V] with 0.025V steps. Default 0 (1.2V)[1]
|:----------------------------------------------------------------------------:|

From the elinux wiki.

Answer 3

There are a list of confirmed clock speeds achieved which would save you some time: http://elinux.org/RPi_config.txt#Overclocking_options so someone has managed 1000MHz with some overvolting applied, of course this invalidates your warranty so maybe stock up on a few :)