Should I turn off turbo boost for i7-4790k, and how?

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DamianMD

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Aug 7, 2016
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While my cpu is overheating when rendering scene in 3ds max, (temperature goes over 85C, blue screen when reach 99C) it works fine while gaming, no matter the game (temperature around 55C). And Im too tired to go all the time to my service, scince its time consuming and usually they dont provide any good solution.
My solution was to go to control panel>power options>(balanced)change plan settings>change advanced power settings> put my maximum processior state to 99% that slower my processor speed and did not raise my temperature above 65% while rendering. Im guessing that also turned off turbo boost. So my question is, if this works for me should i leave it that way or change some settings in bios or something like that.
Im not very smart about all this stuff, and usually dont touch things in bios, so if possible I want precise respond or solution.
thanks in advance, and sorry for bad english.

my pc build: cpu: i7 4790k with cooler master hyper 103;
mb: GB z97x UD5h BK with latest bios;
ram: 2x8 GB Kingston hyperx fury black1600mhz;
gc: GB gtx 750ti bk;
psu: cooler master b2 series 600W;
ssd: toshiba q series pro 128GB;
hdd: toshiba 1TB;
with windows 10.
 
Solution
synphul
That's not true, turbo boost does work with all 4 cores enabled.

1 core active, 4.4ghz.
2 cores active, 4.4ghz.
3 cores active, 4.3ghz.
4 cores active, 4.2ghz.

Base clocks out of the box are 4ghz, up to 4.4ghz and 4.2 is a 200mhz bump over 4ghz even when all 4 cores are active.

Click on the '4th gen' link to expand the chart provided by intel detailing how the turbo boost frequencies work for the 4790k.
http://www.intel.com/content/www/us/en/support/processors/000005523.html

You may very well need a better cooler since the 4790k is one of the fastest (technically has the fastest clock speeds) clocked intel cpu's straight from the box. Hyper threading makes the cores more efficient by keeping them fed with data so they process...
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DamianMD

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Aug 7, 2016
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oh... dont really know how things work. Maybe it is cooler, thanks for answer :)

 
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Karsten75

Karsten75

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Oct 15, 2009
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So here's the idea behind Intel's Turbo Boost.

Each processor has a Thermal Design Power (TDP) rating that specifies how much power it can burn (and convert into heat) during normal operation. More or less, Google it for a more precise definition. That TDP assumes that the processor is operating all it's cores in a "normal" fashion. If only one of the cores are active, then there is a little headroom and it's possible to boost the frequency a little higher to improve the performance of that one core without exceeding the TDP.

If all cores are active, then there is no Turbo Boost. If the cores are running too hot, then throttling tries to lower the frequency - if cooling is inadequate, then it will shut down with a thermal event in the log.
 
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DamianMD

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Aug 7, 2016
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I did not know about "If all cores are active, then there is no Turbo Boost" so i think I found solution behind this thread http://www.tomshardware.co.uk/answers/id-2220365/4790k-running-ghz-full-load-stress-test.html
Im thinking scince rendering uses all cores, my speed should be 4.2Ghz but instead it is ~4.4 and I have cheap cooler, so maybe thats the problem.
http://pasteboard.co/65GO3uq1D.png
Should I manually set core speed in bios, of course if this is the problem, but if not, i ll probably buy a new cooler... :)
 
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synphul

synphul

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Mar 11, 2011
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That's not true, turbo boost does work with all 4 cores enabled.

1 core active, 4.4ghz.
2 cores active, 4.4ghz.
3 cores active, 4.3ghz.
4 cores active, 4.2ghz.

Base clocks out of the box are 4ghz, up to 4.4ghz and 4.2 is a 200mhz bump over 4ghz even when all 4 cores are active.

Click on the '4th gen' link to expand the chart provided by intel detailing how the turbo boost frequencies work for the 4790k.
http://www.intel.com/content/www/us/en/support/processors/000005523.html

You may very well need a better cooler since the 4790k is one of the fastest (technically has the fastest clock speeds) clocked intel cpu's straight from the box. Hyper threading makes the cores more efficient by keeping them fed with data so they process faster than an i5 without ht. That leads to higher heat production. Cooling will also depend on ambient room temps and what the settings are in the bios, it might be worthwhile checking to see what the core voltage is with a program like hwinfo64.

"Auto" and any 'performance' type settings enabled can provide a slight overclock and allow the core voltage to be raised automatically to compensate. Higher core voltage than necessary translates to higher temps. Some of these things you'll need to do yourself since all cpu's are different and one 4790k may run at 1.18v vcore while another may require 1.26v vcore to run stable. There's no way for any of us to tell or to tell what your actual vcore is when rendering when your temps rise so high. A better cooler would likely be a good solution regardless, the hyper 103 is pretty lacking with only 3 heatpipes and a 92mm fan to cool one of the fastest desktop cpu's. Even the 212 evo which is considered a budget cooler has 4 heatpipes with a 120mm fan.
 
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Solution
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DamianMD

Commendable
Aug 7, 2016
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1,510


Thanks for your help, my settings in bios, for everything, were in auto, I supose gigabyte mb is set to boost at 4.4 even though all 4 cores are active, so i put those values(4.4,4.4,4.3,4.2) for core speed manually, and now I got stable temperatures. I dont plan on overclocking, maybe in the future, but I ll definitely buy better cooler. Although I dont really know if this is the right solution, but currently it works for me.
 
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