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+---- Thread: Super Turbo settings Raspberry Pi (/showthread.php?tid=199272)
RE: Super Turbo settings Raspberry Pi - fernandovg - 2014-08-06
But what about this:
pll_freq = floor(2400 / (2 * core_freq)) * (2 * core_freq)
gpu_freq = pll_freq / [even number]
http://elinux.org/RPiconfig
pll=freq = floor(2400 / (2 * 610)) * (2 * 610) = 2440
gpu_freq = pll_freq / [even number] = 2440 / 4 = 610
Mine is 500. The math shows as 610.
RE: Super Turbo settings Raspberry Pi - popcornmix - 2014-08-06
(2014-08-06, 19:49)fernandovg Wrote: pll=freq = floor(2400 / (2 * 610)) * (2 * 610) = 2440
gpu_freq = pll_freq / [even number] = 2440 / 4 = 610
Mine is 500. The math shows as 610.
You can't run gpu_freq at 610. v3d can only be overclocked to ~350MHz.
If you set core_freq=610, yes you will get a pll=2440.
If gpu_freq is not specified will aim for 250MHz using the largest even divisor of pllfreq.
In this case you will get 244MHz which will be fine.
You could specify gpu_freq=305 which would probably work okay, but I'd be suprised if you can see the difference between that and 244MHz.
RE: Super Turbo settings Raspberry Pi - MediaPi - 2014-08-06
(2014-08-06, 20:06)popcornmix Wrote: If you set core_freq=610, yes you will get a pll=2440.
are you sure? I get a pll of 1220 with core @ 610, unless I'm reading the formulae wrong?
RE: Super Turbo settings Raspberry Pi - black_eagle - 2014-08-06
(2400 / (2 * 610)) * (2 * 610) =2400 doesn't it ?
2*610=1220
2400/1220=1.967213115
1.967213115*1220=2400
RE: Super Turbo settings Raspberry Pi - MediaPi - 2014-08-06
floor(x) = \lfloor x\rfloor is the largest integer not greater than x
http://en.wikipedia.org/wiki/Floor_and_ceiling_functions
(2400 / (2 * 610))= 1.96721311475
floor(2400 / (2 * 610)) = floor(1.96721311475) = 1
1* (2 * 610) = 1220
RE: Super Turbo settings Raspberry Pi - black_eagle - 2014-08-06
Lol, missed that bit
If it had been written [2400 / (2 * 610)] I may have remembered from my school days
RE: Super Turbo settings Raspberry Pi - MediaPi - 2014-08-06
yeah when I first read the formulae I had to think which bracket goes where lol
RE: Super Turbo settings Raspberry Pi - popcornmix - 2014-08-06
(2014-08-06, 21:06)MediaPi Wrote: are you sure? I get a pll of 1220 with core @ 610, unless I'm reading the formulae wrong?
Ah yes, if you add max_pll_freq=2440 to config.txt what I said would be true..
That means:
If you set core_freq=610, yes you will get a pll=1220.
If gpu_freq is not specified will aim for 250MHz using the largest even divisor of pllfreq.
In this case you will get 152.5MHz which is a bit low.
So in this case, you should specify gpu_freq=305 which would probably work okay.
Or, avoid_pwm_pll=1 would use a second PLL for gpu, which means you would get exactly 250MHz (but analogue audio may be degraded).
RE: Super Turbo settings Raspberry Pi - black_eagle - 2014-08-06
Well, my settings are only
arm_freq=1100
core_freq=550
sdram_freq=550
over_voltage=6
and I'm quite happy with how it's running.
RE: Super Turbo settings Raspberry Pi - MediaPi - 2014-08-06
I've not got my core to be *somewhat* stable past 570, but I keep it at 550. can nowhere near get 610.so I always just use the formulae
pll_freq = 4*core_freq
I bet 99.99% people wont get past 600...so this formulae is right 99.99% of the time LOL (anything below 600 will always give you floor(x)=2)
my settings
arm_freq=1100
core_freq=550
sdram_freq=650
over_voltage=8
over_voltage_sdram=4
but I've increased the v3d and h264 to 275 (I need good analogue audio since Im using composite out)
and with good keymapping I dont need nor want any faster. Pi has amazing playback quality
RE: Super Turbo settings Raspberry Pi - steve1977 - 2014-08-09
I will finally have some time this weekend to take care of the over-clocking. Just accessed my rpi/openelec from my windows based computer. Seeing many folders such as backups, downloads, logfiles, update, etc. There is also a folder called "configfiles", which includes files such as hosts.conf. Shall I create the config.txt file and dump it into this folder. Or is this more difficult? Same question for how to update? Just dump the img-file into the update folder?
RE: Super Turbo settings Raspberry Pi - JonSnow88 - 2014-08-09
you can plug the sd card into your pc and you will see the config.txt and modify it that way. The other option is tio use putty as explained here. Lastly if you search the openelec forums there is an openelec config all that lets you set most of the settings in this thread.
RE: Super Turbo settings Raspberry Pi - steve1977 - 2014-08-09
Thanks. So, just copying it over the network in one of those folders would not work? What about updating. Will this work by just copying the img file into the update folder?
RE: Super Turbo settings Raspberry Pi - JonSnow88 - 2014-08-09
your gonna have to read the openelec wiki but i think you can drop the image in a folder and on the next reboot it will install it.
RE: Super Turbo settings Raspberry Pi - mildenhall - 2014-08-09
You need to copy the tar file and NOT the img file to the update directory. :-)