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Thanks. When I downloaded the image, it was a .gz file. Where do I get the tar file?
Also, possible to do the same with the config.txt or are SSH and plugging into compiuter the ony two options?
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As we're getting off topic, private message me and I'll tell you.
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da-anda
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well, check the GPU in that case. AFAIK popcornmix moved audio resampling etc to the GPU in recent builds - could be wrong though.
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da-anda
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I'm no hardcore PI modder, so can't tell. I'm fine with the approved and documented overclocking combinations. And as said - I could be wrong on that.
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Thanx to all of you for the overclock tips!!!!
This is the best and most stable overclock for my Pi:
arm_freq=1100
core_freq=550
sdram_freq=600
over_voltage=8
over_voltage_sdram=4
gpu_mem=256
force_turbo=1
disable_overscan=1
avoid_pwm_pll=1
hdmi_force_hotplug=1
hdmi_force_edid_audio=1
hdmi_group=1
hdmi_mode=31
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What is the purpose of avoid_pwm_pll?
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Warez
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2014-12-11, 22:24
(This post was last modified: 2014-12-11, 22:47 by Warez.)
Hi can anybody help me.. I stil dont unstand how this works:
pll_freq = floor(2400 / (2 * core_freq)) * (2 * core_freq)
gpu_freq = pll_freq / [even number]
If i dont want to use avoid_pwm_pll=1 and want my gpu_freq @ 350... how do calculate my core_freq?
Let's say i want a core_freq of 600 and a gpu_freq of 350
If i use core_freq=650 is the gpu_freq=325?
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core_freq is the important one. That makes xbmc go faster. gpu_freq doesn't make xbmc measurably faster.
core_freq makes the ARM's L2 cache go faster, makes peripheral and sdram access a bit quicker and speeds up some GPU tasks like jpeg decode. All useful.
gpu_freq makes the 3D and video decode blocks go faster - but they are not a bottleneck. You can underclock the video decode block at 150MHz and still play 1080p video. The 3D block is mostly idle when rendering xbmc's gui.
The simple rule is to set gpu_freq to half of core_freq when core_freq >= 500.
if you want to know what happens, then:
core_freq=600 means pll_freq = 2400.
If you don't specify gpu_freq it will not exceed the default of 250 and it will choose the smallest N where pll_freq/(2*N).
This works out at N=5 and gpu_freq=240 which will be fine, although underclocked a fraction (you won't notice).
The next notch up will ne N=4, which gives gpu_freq=300. I'd be surprised if you can measure the difference between that and 240 though.
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Warez
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2014-12-12, 09:32
(This post was last modified: 2014-12-12, 11:29 by Warez.)
Oke if i get this right my settings will be:
1.
arm_freq=1150
core_freq=550
sdram_freq=650
over_voltage=8
over_voltage_sdram=4
avoid_pwm_pll=1 <----use this or not?
force_turbo=1
max_usb_current=1
h264_freq=275 <---- half core
gpu_mem=192 <------ or is it: gpu_mem_512=192
isp_freq=275 <---- half core
v3d_freq=275 <---- half core
disable_overscan=1
hdmi_force_hotplug=1
hdmi_ignore_cec_init=1
or?:
2.
arm_freq=1150
core_freq=550
sdram_freq=650
over_voltage=8
over_voltage_sdram=4
avoid_pwm_pll=1 <----use this or not?
force_turbo=1
max_usb_current=1
gpu_freq=275 <---- half core ....gpu_freq Sets core_freq, h264_freq, isp_freq, v3d_freq together. Default 250 so it will make the core_freq to 275 as well?
gpu_mem=192
disable_overscan=1
hdmi_force_hotplug=1
hdmi_ignore_cec_init=1
like you suggested underclock the GPU:
3.
arm_freq=1150
core_freq=600 overclock to 600
sdram_freq=650
over_voltage=8
over_voltage_sdram=4
avoid_pwm_pll=1 <----use this or not?
force_turbo=1
max_usb_current=1
h264_freq=200 <---- underclock
gpu_mem=192
isp_freq=200 <---- underclock
v3d_freq=200<---- underclock
disable_overscan=1
hdmi_force_hotplug=1
hdmi_ignore_cec_init=1
with of the settings do you recommend
or is it just as simple as this?:
arm_freq=1150
core_freq=600
sdram_freq=650
over_voltage=8
over_voltage_sdram=4
force_turbo=1
max_usb_current=1
gpu_mem=192
disable_overscan=1
hdmi_force_hotplug=1
hdmi_ignore_cec_init=1
The Pi will set the gpu_freq= to Default 250 or 240 if you set core_freq=600 and that's it?