Aureus
Posts: 1
Joined: Thu Feb 16, 2017 5:26 pm

How far have you overclocked?

Thu Feb 16, 2017 5:33 pm

Hello all,

I have overclocked my rpi to these settings:

arm_freq=1100
core_freq=500
sdram_freq=500
over_voltage=6

With these settings my B+ is very snappy and doesn't lag with youtube and other heavy-sites.
Raspberry Pi B+ OCed to 1.1ghz CPU, .5ghz GPU, .5ghz SDRAM

jahboater
Posts: 5960
Joined: Wed Feb 04, 2015 6:38 pm
Location: West Dorset

Re: How far have you overclocked?

Fri Feb 17, 2017 3:34 pm

Trouble is most people have moved on to the Pi2 or probably the Pi3. The Pi3 is quad core armv8 (compared to single core armv6 on the B+) at 1.2GHz with 1GB of ram.

If speed is what you are after, the Pi3 is many many times faster than the B+ (ten times or more) and its the same purchase price!

User avatar
bensimmo
Posts: 4743
Joined: Sun Dec 28, 2014 3:02 pm
Location: East Yorkshire

Re: How far have you overclocked?

Fri Feb 17, 2017 4:54 pm

B+ can do 1Ghz via official overclock now?
At least mine do as do the A+.
10% is not a bad increase over that, what sort of browser benchmarks improvement do you get?

(I don't know what Ram frequencies are without looking them up)

£30 is £30 more than nothing if you have a B+ to get a 3B.

I've never bothered above the default selector (and then I don't now as it too much hassle when you swap between Zero/A+/2B/3B with SD cards.)

Does the B+ have the SD card overclock?

matt1313111
Posts: 1
Joined: Sun Feb 19, 2017 4:24 pm

Re: How far have you overclocked?

Sun Feb 19, 2017 5:22 pm

This is my typical overclock ( I have 5 pi 3's and this overclock will work reliably on all five of them, out of those 5, 2 of them Overclock really well and I will post that Overclock as well).
Normal Overclock -
disable_pvt=1
current_limit_override=0x5A000020
initial_turbo=60
force_turbo=1
arm_freq=1450
gpu_freq=575
core_freq=575
over_voltage=8
sdram_freq=625
sdram_schmoo=0x02000020
over_voltage_sdram=8
dtoverlay=sdhost,overclock_50=100
#video_hard_sync=true
video_hard_sync_frames=3
video_frame_delay=5

High overclock -
disable_pvt=1
current_limit_override=0x5A000020
initial_turbo=60
force_turbo=1
arm_freq=1500
gpu_freq=625
core_freq=625
over_voltage=8
sdram_freq=675
sdram_schmoo=0x02000020
over_voltage_sdram=8
dtoverlay=sdhost,overclock_50=100
#video_hard_sync=true
video_hard_sync_frames=3
video_frame_delay=5
A few things I want to explain, First and foremost without excessive (and quite LOUD) cooling fans, real pure copper heat sinks on the CPU and Ram (I have one the USB/Ethernet controller as well for look). if you have not active cooling this will fry your pi so fast that you wont know what hit you ( i measured from 32c to 85c with just heat sinks and no fans took 3.2 minutes). As far as my fan system goes it is also a bit extreme for most people. most people use 30 mm fans pushing between 2-4 CFM of air, I found on amazon a 5V fan that will fun off the GPIO pins that pushes 15 CFM of air, its 50mm and requires some modifications to you case to fit it properly (at least I have not found a case made to hold a 50mm fan). This with a good metal case with lost of ventilation will keep you under 65c under heavy load. Now I do have a custom (i customised myself) a 120mm usb fan that pushes 80 CFM of air that I use for 2 purposes. 1) every pi I buy I want to know the Overclock limits when temp is taken out the equation entirely (this fan will keep my pi's at room temp all day for days at 100 load overclocked to 1.65 GHz with GPU and core both at 650 and ram at 700 MHz, not all my pi's will get this high but this was the best I've been able to manage). 2. I have a special edition solid hand milled aluminum case with a glass top cover (looking back 90$ on a case was a bit dumb but no looking back now) this case only has vent holes on the botton so I place the case on top the raised fan when i use that unit ( not very often since the pi in that case is the one with the crazy overclock listed above so its more of show piece than a unit I use daily). Any way point being please don't try any thing like my Overclock settings without some know-how and lots cooling. Here is a safer Overclock (in my experience) with just heat sinks (if you don't use heat-sinks you have no business overclocking period!)
Safer overclock-
#disable_pvt=1
#current_limit_override=0x5A000020
initial_turbo=30
#force_turbo=1
arm_freq=1300
gpu_freq=475
core_freq=475
over_voltage=3
sdram_freq=500
sdram_schmoo=0x02000020
over_voltage_sdram=3
dtoverlay=sdhost,overclock_50=100

Also i hope it goes without saying that the SD card you use is extremely important I personally recommend overkill big time here! Read and write 90 mbps each way or more i use Samsung pro select and SanDisk extreme pro (as of this writing the 32gb SanDisk is 36$ and the Samsung is 27$ both at 32 GB). I'm not going to go into power supplies if your reading this you should know this.

theWinterDojer
Posts: 1
Joined: Sat Aug 05, 2017 2:20 am

Re: How far have you overclocked?

Sat Aug 05, 2017 2:25 am

matt1313111 wrote:
Sun Feb 19, 2017 5:22 pm
This is my typical overclock ( I have 5 pi 3's and this overclock will work reliably on all five of them, out of those 5, 2 of them Overclock really well and I will post that Overclock as well).
Normal Overclock -
disable_pvt=1
current_limit_override=0x5A000020
initial_turbo=60
force_turbo=1
arm_freq=1450
gpu_freq=575
core_freq=575
over_voltage=8
sdram_freq=625
sdram_schmoo=0x02000020
over_voltage_sdram=8
dtoverlay=sdhost,overclock_50=100
#video_hard_sync=true
video_hard_sync_frames=3
video_frame_delay=5

High overclock -
disable_pvt=1
current_limit_override=0x5A000020
initial_turbo=60
force_turbo=1
arm_freq=1500
gpu_freq=625
core_freq=625
over_voltage=8
sdram_freq=675
sdram_schmoo=0x02000020
over_voltage_sdram=8
dtoverlay=sdhost,overclock_50=100
#video_hard_sync=true
video_hard_sync_frames=3
video_frame_delay=5
A few things I want to explain, First and foremost without excessive (and quite LOUD) cooling fans, real pure copper heat sinks on the CPU and Ram (I have one the USB/Ethernet controller as well for look). if you have not active cooling this will fry your pi so fast that you wont know what hit you ( i measured from 32c to 85c with just heat sinks and no fans took 3.2 minutes). As far as my fan system goes it is also a bit extreme for most people. most people use 30 mm fans pushing between 2-4 CFM of air, I found on amazon a 5V fan that will fun off the GPIO pins that pushes 15 CFM of air, its 50mm and requires some modifications to you case to fit it properly (at least I have not found a case made to hold a 50mm fan). This with a good metal case with lost of ventilation will keep you under 65c under heavy load. Now I do have a custom (i customised myself) a 120mm usb fan that pushes 80 CFM of air that I use for 2 purposes. 1) every pi I buy I want to know the Overclock limits when temp is taken out the equation entirely (this fan will keep my pi's at room temp all day for days at 100 load overclocked to 1.65 GHz with GPU and core both at 650 and ram at 700 MHz, not all my pi's will get this high but this was the best I've been able to manage). 2. I have a special edition solid hand milled aluminum case with a glass top cover (looking back 90$ on a case was a bit dumb but no looking back now) this case only has vent holes on the botton so I place the case on top the raised fan when i use that unit ( not very often since the pi in that case is the one with the crazy overclock listed above so its more of show piece than a unit I use daily). Any way point being please don't try any thing like my Overclock settings without some know-how and lots cooling. Here is a safer Overclock (in my experience) with just heat sinks (if you don't use heat-sinks you have no business overclocking period!)
Safer overclock-
#disable_pvt=1
#current_limit_override=0x5A000020
initial_turbo=30
#force_turbo=1
arm_freq=1300
gpu_freq=475
core_freq=475
over_voltage=3
sdram_freq=500
sdram_schmoo=0x02000020
over_voltage_sdram=3
dtoverlay=sdhost,overclock_50=100

Also i hope it goes without saying that the SD card you use is extremely important I personally recommend overkill big time here! Read and write 90 mbps each way or more i use Samsung pro select and SanDisk extreme pro (as of this writing the 32gb SanDisk is 36$ and the Samsung is 27$ both at 32 GB). I'm not going to go into power supplies if your reading this you should know this.
Is sdram_schmoo necessary if I'm not going over sdram_freq=500?

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