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CPU Frequencies and Cooling and Speed
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* July 29, 2016, 11:45:14 AM
CPU Frequencies and Cooling and Speed,

I've discovered some things about the workings of the computer and temperatures and speed as I was doing the tutorial animations in TC 2016 Pro.  Last week I had big issues with a hot CPU.  I have an AMD FX-8350 and the max temperature is 62°C and I was running 77°C with a max temperature in the 80's.  Not good.  I contacted AMD and Arctic Freezer Pro 7 and they worked with me the best they could.  I switched cooler fan positions and case fans to all different configurations.  I even bought an extra fan and new thermal paste to put between the cooling fan and the CPU.  That helped.  Then I discovered that the CPU frequency multipliers on one of my computers was at 7 and on my hot CPU computer it was much higher, about 20.  It took me a while to find out how to change the CPU multiplier and when I did I found that it had a direct relationship to the CPU temperature and computer speed.  The good news is that I don't feel the need to buy a new CPU heat sink cooler and all I have to do to get a cooler CPU was to reduce the the CPU multiplier.  The bad news is that if I am using a lower CPU multiplier then things on the computer, like videos and tutorial animations, would run much, much slower.  So I had to compromise somewhat and I chose a CPU multiplier at 20 and now my CPU temperature is around 40°C.  I am not a gamer and this experience is the closest I've been to overclocking.

**EDIT**  I have also experienced my computer shutting down unexpectedly because the CPU was overheated but now I have things under control.

John B.
« Last Edit: July 31, 2016, 07:42:22 AM by John B. »

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700


August 02, 2016, 02:58:47 PM
#1
If you homebrew your machines, many motherboards now come with overclocking control tools.  The ones I've seen allow saving specific presets so you can 'hulk up' when necessary, but run at cooler temperatures the rest of the time.


Jeff


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TC Pro Platinum 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1


* August 02, 2016, 03:46:11 PM
#2
AMD has OverDrive and I can make changes in voltage and frequency but I'm not sure the settings stay the next time the computer gets turned on but I don't fully understand what's going on as I see the frequencies fluctuate before my eyes.  As I typed this note the frequency multiplier is at 7 and I went to run an animation and they stayed at 7 with no slowdown.  So now, things are running cool (21°C) and no loss of performance.  I don't want to spend anymore hours trying to fix what ain't broken.

John B.

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700


August 02, 2016, 06:01:55 PM
#3
Then your overclocking manager is intelligent, increasing clock speed only when necessary.  However, its base rate may be high enough to cause overheating.  You may have to experiment with it.


Jeff


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TC Pro Platinum 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1


* August 02, 2016, 06:17:43 PM
#4
Right now everything seems to be OK and MY experimenting will ruin everything.  lol

John B.

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700


* August 03, 2016, 04:39:48 AM
#5
What you are seeing with the changing frequencies is something along the lines of Turbo modes. As Jeff mentioned, CPU's will adjust their speeds according to the work loads. Example, my CPU is rated at 3.4 GHz, with a 3.9 GHz Turbo mode. Be aware that the standard CPU coolers that come with most PC's or CPU's are intended for cooling at normal clock speeds and occasional Turbo mode. Permanent overclocking will always cause CPU's to generate excess heat, and that has to be dealt with using an aftermarket custom cooler. Most modern systems will throttle back the speeds when temperatures exceed a preset threshold, and you'll realize this as sluggish performance.

It is also a good idea to periodically open up your case and blow out any dust that accumulates, especially on the fans and heat sinks of the CPU.

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TC 21 Deluxe, TC 20 Platinum, TC 2015 Platinum, TC 2016 Platinum, TC 2017 Platinum
i7- 3770 Ivy Bridge 3.4 GHz, 16G Crucial Ballistic, ASRock Extreme 4, EVGA 1060 SSC, Windows 10 Pro 64 Bit


* August 03, 2016, 08:34:13 AM
#6
OverDrive has Turbo Core Control and if I want to change frequencies I have to play with that somehow.  I took the case out to the driveway and with a Shop-Vac in blower mode I blew out all the dust.  Then, the copper piece of heat sink of the after market cooler wasn't absolutely flat so I lapped it with wet and dry sandpaper and that improved contact with the CPU which helped.  The frequency multiplier is at 7 when I now start the computer and then adjust automatically as I use more things like Internet, TurboCad rendering and TV so maybe I might have done something to start things off by initiating change.  The more things I have running the higher the temperatures and frequencies and when I stop them the temperatures and frequencies drop so maybe things are under control now.   Last year I sent the CPU back to AMD because of the shutting down issue but now I believe it was the cooling system's fault.  After all the years of owning a computer I am only now starting to understand how it works.

**EDIT**  One computer seems to adjust frequencies by itself but the other I must do it manually to bring the temperature down and I'll examine to find what the fix is.

John B.
« Last Edit: August 03, 2016, 02:09:12 PM by John B. »

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700


* August 04, 2016, 03:25:22 AM
#7
"Then, the copper piece of heat sink of the after market cooler wasn't absolutely flat so I lapped it with wet and dry sandpaper and that improved contact with the CPU which helped."

Isn't there some kind of goop that's intended to improve heat transfer in such cases?

Henry H 

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* August 04, 2016, 06:36:18 AM
#8
Isn't there some kind of goop that's intended to improve heat transfer in such cases?

Yes, it is called thermal paste and I used some as well but I lapped because I was getting desperate.

John B.

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700


August 04, 2016, 07:26:53 AM
#9
Just something I recently researched was which way round should a fan be as sometimes they can be fixed either way? i.e. sucking the hot air off the heatsink or blowing onto it?

It is more efficient for the fan to be blowing onto the heatsink fins. FWIW...  ;)

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Daz...
V2017 64-Bit & 32 Bit Platinum Edition
RedSDK Only in 64 bit & 32 bit = RedSDK & Lightworks
TurboCAD user since V3 and Turbocad 3D V1.
OS Windows7 Pro 64bit Lenovo W701 Laptop, 24GB Ram, 2 x 128 SSD harddrives, NVIDIA Quadro FX 2800M Graphics, Intel i7 CPU...


* August 04, 2016, 09:25:02 AM
#10
Darrel,

Good observation.  From what I gather, it is important to get hot air out of the case and exhaust fans would allow cooler outside air to come into the case and go through the cooler's heatsink.  I've tried it both ways and now I have my cooler fan pointing upward through the fins towards the outside of the case and above it I have another fan on top of the case as an exhaust fan and another exhaust fan in the back of the case at the level of the heatsink.  The PSU fan is exhaust.  If you simply blow air onto the cooler heatsink then that air needs to be pushed out of the case.  I could put a fan on the side of the case to blow air onto the heatsink but the vent holes don't line up and would only blow onto the video card.

Thanks,

John B.

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700


August 05, 2016, 01:27:20 PM
#11
My last 3 computer builds have all gone into an Antec 900 case with a 200mm top-mounted fan (moves a lot of air fairly quietly).  Not the easiest to swap out drives and route cables, but nothing burns up and my tinnitus isn't aggravated.

I currently have a Cooler Master 212 EVO CPU fan because the NH-D15 I bought didn't fit (can't just trust every online configurator site you find, it seems).


Jeff


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TC Pro Platinum 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1


* August 05, 2016, 02:16:25 PM
#12
Hi Jeff,

On each of my computers I replaced the stock AMD fan/heatsink with Arctic Freezer 7 Pro with 92 mm fans and quiet.  Also, I added to each computer quiet fans at about 120 mm.  The AMD fans sound like a moped that sticks in second gear, really bad up and down.  Right now the temperatures are under control, no more 80°C.  I set the fans as exhaust.

John B.

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700


August 09, 2016, 12:58:38 PM
#13
Hi, John:

I have the 200mm top fan as exhaust.  The power supply fan (when it feels the need to turn on) pulls air in from the back and blows up from the bottom of the tower case.  The one fan in the front that's active is blowing in over the hard drives and towards the bottom of the graphics card (which has its own fans).


Jeff


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TC Pro Platinum 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1


* August 09, 2016, 03:12:33 PM
#14
Hi  Jeff,

Looks like you have a good direction of air.  I don't have a fan in front.  Never any heat issue with hard drives or the video card with it's own fan.

John B.

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John B.
TCv2016 Pro Platinum
Windows 7 Pro 64 Bit
1 GB Hard Drive 16 GB RAM
AMD Radeon HD 7700