Don't take multiple passes of memtester as proof that your RAM is entirely stable.
The RAM on my Pi2B can pass the above test for hours at a time at 485MHz with over_voltage_sdram=2
, but still suffers random web browser exits and Quake3 Arena and Quake Darkplaces lockups unless lowered to 475MHz. None of the 20-odd combinations of sdram_p
overvolt settings I've tried here help one iota, so I've stuck with the global sdram
It's definitely the RAM that's causing it because I've removed everything else from the equation by running stock speeds and voltages everywhere else when trying to find the source of the instability, and lowering the RAM clock is the only thing that affects and fixes it.
The best I can manage for what appears
to be complete stability under the harshest of testing I can throw at it is...
Code: Select all
# Custom overclocking settings
dtoverlay=sdhost,overclock_50=100 <- The Sandisk Ultra UHS-I microSD card I use is perfectly happy with this.
force_turbo=1 <- Locks sdhost to 100MHz for 42MB/s seq. reads from this card. Bye bye warranty!
# GPU RAM increased for gaming
Quake3 Arena has vcgencmd measure_temp
reporting 83°C at times even with the Pi in a large, well ventilated case with a 40mm fan pumping in room temperature air, so I'll be adding a small heatsink at some stage to avoid harmless (but potentially annoying when gaming) thermal-throttling during warmer weather.
It does go like stink now in some respects compared to running at stock clocks, so I'm not complaining.