2016-08-07, 18:22
I'd rather we didn't continue the overclocking discussion here (as it can go on and on, and has nothing to do with testing these builds), however I just wanted to comment on the following:
over_voltage_sdram sets over_voltage_sdram_p, over_voltage_sdram_i and over_voltage_sdram_c simultaneously.
over_voltage_sdram_p - sets the phystical voltage for the SDRAM
over_voltage_sdram_i - sets the voltage for SDRAM I/O
over_voltage_sdram_c - sets the voltage for the SDRAM controller
I needed to set over_voltage_sdram=5 (and sdram_schmoo=0x02000020) for a stable sdram_freq=580, so it does improve stability. Without bumping the SDRAM voltage I'd have SDRAM errors.
I have a NOOBS 8GB sd card and "dtparam=sd_overclock=100" increases the sequential read performance from about 20MB/s to 42MB/s, so quite worthwhile (if your card supports it).
(2016-08-07, 17:42)smp1 Wrote: over_voltage_sdram doesn't seem to do anything for stability, I think it doesn't even work on RPi3.
over_voltage_sdram sets over_voltage_sdram_p, over_voltage_sdram_i and over_voltage_sdram_c simultaneously.
over_voltage_sdram_p - sets the phystical voltage for the SDRAM
over_voltage_sdram_i - sets the voltage for SDRAM I/O
over_voltage_sdram_c - sets the voltage for the SDRAM controller
I needed to set over_voltage_sdram=5 (and sdram_schmoo=0x02000020) for a stable sdram_freq=580, so it does improve stability. Without bumping the SDRAM voltage I'd have SDRAM errors.
(2016-08-07, 17:42)smp1 Wrote: I don't see the point of OCing the sdcard.
I have a NOOBS 8GB sd card and "dtparam=sd_overclock=100" increases the sequential read performance from about 20MB/s to 42MB/s, so quite worthwhile (if your card supports it).