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mahjongg
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Re: Overclocking success over 1GHz?

Thu Feb 05, 2015 12:18 pm

Zanith wrote: You was saying???? If you overvolt something with no cooling it would burn out (depending on voltage+current) seriously where do you get the idea that heat is good for overclocking?
Nowhere, you are misinterpreting what I said.

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Lob0426
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Re: Overclocking success over 1GHz?

Thu Feb 05, 2015 1:27 pm

I live in Northern California. A high desert area. 100+ F (37C) not uncommon in summer. Temperatures inside a car are 145F (62C). In that use I would use sinks. Or a closed case for outdoor work like a camera install.

In the house, I use air conditioning!

No problems outside right now 35F (1.6C) only because this is a warm winter this year.

Overall I wonder why the push for overclocking when we really have not seen what it will do without the overclock.
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Bikeman
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Re: Overclocking success over 1GHz?

Fri Feb 06, 2015 7:14 pm

DougieLawson wrote:
Vennt wrote:My heatsink pack arrives today, I'll pop it on my Pi 2 and report the results.
Why? Do you live in the Mojave, Sahara or Gobi desert or somewhere the outdoor temp is above 40C and you're running it out of doors?

If not the you DO NOT need a heatsink or a fan. It has one effect only, it gives a £1 of your money to the snake oil salesman selling it.
I beg to differ. I live in Germany, it's not exactly summer right now here and when I put my new Pi2 into a nice B+ case and had it run 4 [email protected] (BOINC) tasks in parallel, the temp maxed out at ca 77 deg C. Yes I overclock and overvolt, according to the "PI2" setting in the overclocking menu of raspi-config (1GHz).

OK, technically maybe I don't "need" a heat sink because it's not reaching the temperature level where the CPU shuts down itself (I think it does eventually, right?), but still 77deg C is not healthy 24/7 IMHO. And I don't want it to sit there naked without a case or cover, easy prey for the cats ;-).

So I put a little heat sink on the CPU , and the temperature is now 10 deg C lower.

I think the Foundation should consider including a heat sink with every PI2 because this is bound to lead to problems, especially since the Pi2 fits so nicely into existing B+ cases that actually were not meant for or tested with the higher heat dissipation of the Pi2B. I mean some of those cases are almost airtight! For the PI"1" I totally agree, I never managed to get mine over 60deg C or so even overclocked, but the PI2 seems to be different in this respect.

Cheers
HBE

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rpdom
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Re: Overclocking success over 1GHz?

Fri Feb 06, 2015 7:21 pm

Bikeman wrote:OK, technically maybe I don't "need" a heat sink because it's not reaching the temperature level where the CPU shuts down itself (I think it does eventually, right?), but still 77deg C is not healthy 24/7 IMHO. And I don't want it to sit there naked without a case or cover, easy prey for the cats ;-)
I agree, running your Pi at that temperature may reduce its lifespan. You may only get 25 years out of it instead of 35-40. Best put on a heatsink then.

Fat D
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Re: Overclocking success over 1GHz?

Fri Feb 06, 2015 10:52 pm

Zanith wrote:You was saying???? If you overvolt something with no cooling it would burn out (depending on voltage+current) seriously where do you get the idea that heat is good for overclocking?
But until that happens, it will manage one heck of an overclock.

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mahjongg
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Re: Overclocking success over 1GHz?

Fri Feb 06, 2015 11:45 pm

Yeah if you don't care for the lifetime of your PI, but do it for the sport, then overvolting is definitely an option, (your PI's lifetime might be countable in hours, not decades though). And it seems super cooling silicon can help you find the magical super speed optimum, that can give you an extra few percent more speed. But simply adding a heatsink helps not so much, unless you can overvolt just a bit more without the chip reaching the 85 degrees Celcius where the PI shuttles the speed back to protect itself.

have fun with it, but know what you are doing!

Duck86
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Re: Overclocking success over 1GHz?

Sat Feb 07, 2015 1:14 am

I've been running 950 with no overvolt for over 2 months now with no issues. I have a Pi2 on the way so I might have a play with my current B+ to see if I can push the boundaries a bit. Will let ye know how I get along ;-)

Nifnat
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Re: Overclocking success over 1GHz?

Sat Feb 07, 2015 3:21 pm

The max one of my B+'s booted at is 1.5GHz, with 1.4GHz being stable. This is of course using an external power source (1.8 V ).
The rest of my boards (A mix of B's and B+'s) will not go past 1.2GHz. Most of them reach the 1.2GHz cap at around +5 overvolt.

PiGraham
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Re: Overclocking success over 1GHz?

Sat Feb 07, 2015 4:13 pm

If you Pi2 doesn't work at 900MHz (the official specification) is it considered defective?

I see the raspi-config overclock default is 700MHz and there is a new entry 1000MHz Pi2.

Mine seem to be happily running on that setting.

Seems stable at 1100. Quake3 threw a GL error when selecting spectator mode but I haven't tried that at standard clock.

Code: Select all

arm_freq=1100
sdram_freq=500
core_freq=500
over_voltage=6
[edit]

Code: Select all

arm_freq=1200
sdram_freq=525
core_freq=525
over_voltage=8
force-TURBO=1
Fails to boot and holding shift during boot doesn't recover.

WickedJet
Posts: 1
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Re: Overclocking success over 1GHz?

Sat Apr 04, 2015 5:30 pm

I can easily hit 1.00GHz with no extra cooler, it's a huge improvement over the 700MHz of the normal raspberry pi model b.
For going over 1GHz however, you would certainly need a heatsink, plus a fan to bring the temps down...
Lastly, you would probably want a high amperage power supply for the pi, so it can overvolt itself without drawing too much power.

ripednail
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Re: Overclocking success over 1GHz?

Tue Jul 21, 2015 10:18 am

Raspberry pi 2 b +

arm_freq=1050
over_voltage=4
core_freq=525
gpu_freq=350
sdram_freq=480
over_voltage_sdram_p=2
over_voltage_sdram_i=2
over_voltage_sdram_c=2
gpu_mem=256
Last edited by ripednail on Sat Apr 01, 2017 6:58 am, edited 1 time in total.

MohitBagur
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Location: Bangalore,Karnataka,India

Re: Overclocking success over 1GHz?

Thu Jul 23, 2015 2:02 am

Look at my Pi 2 set up.
ARM_FREQ: 1,500
SDRAM_FREQ:483
ARM_FREQ_MIN:425
OVERVOLT:6

Rock solid at these settings......... :)

Wackywilly
Posts: 1
Joined: Sun Sep 27, 2015 11:49 pm

Re: Overclocking success over 1GHz?

Sun Sep 27, 2015 11:51 pm

I actually hit 2 Ghz, but the Pi wouldn't let me go any higher. Overvolt is 14. Pi runs very cool because of 2 90mm fans and a massive heatsink

MohitBagur
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Location: Bangalore,Karnataka,India

Re: Overclocking success over 1GHz?

Thu Jan 21, 2016 4:33 pm

Now look at my config:

arm_freq=1800
sdram_freq=667
core_freq=450
over_voltage=6
gpu_mem=256

This is on a Raspberry Pi 2 Model B.. I used these specs in my Instructable.. could you guys have a look?
http://www.instructables.com/howto/Rasp ... ll+In+One/

Adarsh Singh
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Re: Overclocking success over 1GHz?

Sat Mar 18, 2017 9:12 am

My pi can go till 1ghz without over_voltage but right now I'm running at 1100 MHz with over_voltage=2.
I have a heat-sink installed.

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