Turbo Boost issue on i7 4770

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Ash Ish

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Feb 21, 2014
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I have a i7 4770 non-K processor. I use this processor mainly for 3d rendering with Mental Ray in 3dsMax. The outputs are good and renders time are pretty less when compared to my i5 6600K. GPU I use with the i7 is 4GB GTX 760 AMP Edition, its old but gets work done.

The problem is when I check my i7 during full load renders, the maximum frequency it reaches is 3.69 MHz. Why my i7 is not working at its full speeds i.e 3.9 GHz Turbo frequency. If its able to get anywhere near to 3.9, my heavy scenes renders will surely be quick. Is there any way to push the clock speeds higher than 3.79. Or is my GPU holding back the CPU?
Also my cooling solutions are all air based. Air flow is good. Max CPU temperatures were 80 degrees C.
Please advise.
 
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97-98c does seem pretty high, even after several hours. Assuming your cooler is properly and securely installed, I wonder about the air flow in the case or just the placement of the computer possibly restricting flow. At any rate, if you do go through the trouble of removing it and reapplying thermal paste, you might consider a water cooler for the CPU. While it's true some air coolers do nearly as well as an all-in-one water cooler, I think the AIO water setup is a bit more forgiving if case air flow is not optimal.
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Roland Of Gilead

Roland Of Gilead

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keep in mind that Turbo mode at 3.9 Ghz is when only 1 core is running in Turbo mode. For each additional core that enters Turbo mode, the highest speed any core can reach in Turbo mode drops 100 Mhz. Even if there remains work to be done, but a certain temperature is reached, turbo mode ends, and the CPU goes back to its listed speed, 3.4 Ghz in this case. So for something like the rendering your doing, you want all cores at their max frequency, in your case it's 3.69ghz. This is normal, and is mostly to do with thermals of the chip. You can't run the CPU at higher than 3.69 on all cores. You could try a BLCK OC depending on your mobo, but it's not ideal to do it that way.
 
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Ash Ish

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Yeh, I read somewhere that higher turbo frequencies are reached when 1 or 2 cores are working. So as you are saying it can reach 3.9 Ghz. Is it possible that I can disable the extra cores to reach that clock speed.
Also should I consider getting a better cooler for the CPU?
 
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Roland Of Gilead

Roland Of Gilead

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a better cooler might help. it will keep the CPU from overheating, and hence the lower clock speed. But really for those rendering tasks you want all cores at their max frequency (in your case 3.69 or whatever). Having 1 or 2 cores at 3.9 will be slower than 4 cores at 3.69. Rendering is CPU intensive, so more cores is better.

The reason the 3.9 turbo is there is more for single threaded application where pure clockspeed matters. Pure clockspeed is less effective than more cores when rendering/streaming etc. but better for gamning (in most cases)

changing the cooler might be a good idea, if anything just to get your full load temps down a bit. 80c isn't bad. I just wouldn't want my system running at those temps for more than a few hours a day. Not 24/7 thats for sure.

I'm not a cooler expert, but most on here would recommend a Noctua NH-D15.
 
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c4s2k3

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Keep in mind that if your rendering apps are multithreaded, it will still be faster to render with all cores at the lower speed than a single core @ 3.9ghz. The behavior you describe is perfectly normal. I would not change a thing unless you can confirm conclusively there is a temperature problem.
 
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Ash Ish

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Okay, my doubts seems to be getting clear about the clock speeds. But I still want to ask about the temperature my processor reaches during prolonged rendering periods.
Usually when a scene takes more time to render, I leave the system overnight, like 6-7 hours sometimes more, temperatures gets as high as 97-98 degrees. I leave all my fans at full blow. My i7 is around 4-5 years old, is it because the thermal compound is no longer efficient? Should I be worried about these high temperatures.
 
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c4s2k3

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Sep 17, 2015
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97-98c does seem pretty high, even after several hours. Assuming your cooler is properly and securely installed, I wonder about the air flow in the case or just the placement of the computer possibly restricting flow. At any rate, if you do go through the trouble of removing it and reapplying thermal paste, you might consider a water cooler for the CPU. While it's true some air coolers do nearly as well as an all-in-one water cooler, I think the AIO water setup is a bit more forgiving if case air flow is not optimal.
 
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