Hardware Reference
In-Depth Information
If we take an example where the core frequency
c
is 500 MHz, then
p
is determined
as follows:
2400
2 500
æ
ç
ö
÷
´´
pfloor
=
(
2 500
)
´
=
2000
Further, if we are targeting a GPU frequency of 300 MHz, we compute
m
:
2000
300
m
=
=
6 666
.
The value
m
is rounded to the nearest
even
integer:
m
=6
The final GPU frequency becomes
p
== =
2000
6
g
333 33
.
The example GPU clock is 333.33 MHz.
Table
2-3
lists the standard clock profiles, as provided by the Raspberry Pi
Foundation. Additionally, it is stated that if the SoC reaches
temp_limit
, the overclock
settings will be disabled. The value of
temp_limit
is configurable.
Table 2-3.
Standard Clock Profiles
Profile
ARM CPU
Core
SDRAM
Over Voltage
None
700 MHz
250 MHz
400 MHz
0
Modest
800 MHz
300 MHz
400 MHz
0
Medium
900 MHz
333 MHz
450 MHz
2
High
950 MHz
450 MHz
450 MHz
6
Turbo
1000 MHz
500 MHz
500 MHz
6
Warranty and Overclocking
At one time, overclocking could void your warranty. Also note that Internet forum users
have reported SD card corruption when trying out overclocked configurations (though
several improvements to SD card handling have been made). Be sure to back up your
SD card.
