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Windows 7: Overclocking help; your suggestions, please.

17 May 2011   #61
GARoss

Windows 7 64-bit
 
 

Thanks guys. I'll reboot later today.


My System SpecsSystem Spec
.
17 May 2011   #62
Dave76

Microsoft Community Contributor Award Recipient

Windows 7 Ult x64 - SP1/ Windows 8 Pro x64
 
 

From post#9
Quote   Quote: Originally Posted by Dave76 View Post

Your CPU spec sheet: Intel Core i5-2500K
The max temp for Tcase (CPU case) is 72.6C, add 5C for CPU core temps then 77.6C is the recommended max core temp.
Quote   Quote: Originally Posted by ignatzatsonic View Post
Incidentally--I've done a little research and from what I can tell, the shutdown temp of the CPU is circa 98; it should begin throttling before that. The "Tcase" temp is supposedly 72 and that is Intel's recommended max LONG TERM temp. I assume that Tcase refers to cores????

According to my brief googling anyway. You could run down the tech documents on Intel.com for the sordid details.
Quote   Quote: Originally Posted by ignatzatsonic View Post
Further research: Tcase temp is 72.6 and is NOT equal to core temps. Rather it is taken from the case surrounding the processor and should be the number referred to as "CPU" in HWInfo32. It's quite close to the core temps, but is a single number rather than 4. Intel apparently does not specify a throttle temp or an absolute shutdown temp, but those temps are believed to be 98-100.

Tcase is max OK long term use temp.
Tcase is the CPU case, have seen many references to the Tcase +5C for the CPU core max temp.

Intel doesn't openly specify a max CPU core temp or throttle or shutdown temp as you mentioned, must be for legal reasons.
The actual throttle and shutdown temps seem to vary from processor to processor, as would be expected. Info can be found on various OC sites. I do remember seeing an Intel link to an obscure Intel data sheet on this subject, buried somewhere in a 60+ page document.

Intel's max Tcase temp is, of coarse, very conservative.

I think the 98-100C throttle temp is a generally accepted number used by BIOS companies, which is why most BIOS have different temp options for over temp warnings.
My options are:
Quote:

CPU Warning Temperature

Sets the warning threshold for CPU temperature. When CPU temperature exceeds the threshold,
BIOS will emit warning sound. Options are: Disabled (default),
60
C/140F
70C/158F
80C/176F
90
C/194F


I am generally conservative on this issue, and follow the rule: electronics + heat = Bad
Always try to get the system at as low temps as possible.
My System SpecsSystem Spec
18 May 2011   #63
Wishmaster

Windows 7 Home Premium 64bit
 
 

After a couple hours of rendering, mine typically stays in the 62-65C range.
You will notice it starts to stabilize itself after a while.


This will be even more so with newly applied Arctic Silver.
If Im not mistaken, AS has a cure time. Unless this has changed, I haven't used it in a while.

So you may very well see those load temps drop a couple degrees in a weeks time when it sets up.

After a night or 2, and a few renders, shut the PC down for the night. It may help it set up a bit.
Basically, give it some time to cure.

Some thermal paste has no cure time. MX-2 for example.


Most Intel CPUs can safely operate at 75C. Although I would by no means consider this ideal.
I would shoot for keeping at 70C or below at full load. Ideally 65ish C.
But, everyone has what they consider to be safe 24/7 load temps. This is just my opinion.

I would go by RealTemp or CoreTemp for reading.
My System SpecsSystem Spec
.

18 May 2011   #64
GARoss

Windows 7 64-bit
 
 

Did an F7 to load optimized defaults; then setup BIOS to the same OC settings I used before. I still had the original 120mm Antec case fan running at HI. It plugs directly into the PSU.

The previous render test was setup by a forum member @ Sony Vegas who uses it as a bench mark. It is designed to push the CPU to the max. A 20 second HD render full of panning, zooming & the most difficult of all to render, text, took 3:16 without OC (3.3Ghz i5-2500K) & 2:54 @ OC set to 4.0Ghz (11.22% faster).

As I'm not a gamer, I used 1 hour of AVCHD & HDV video for 2 separate test renders. Based of the results of the Vegas render, I figured a 1 hour HDV video to take about 3 hours to render. All I can say is video LOVES Intel i5 Sandy Bridge. It rendered the HDV 1 hour video in 88 minutes. It was rendering so fast that the preview screen was black, meaning too many frames to show. AVCHD (H.264 or Mpeg4) was slower but under 2 hours. Temps maxed out @ 64C but remained mostly in the 61-63C range.

I will replace the Antec fan & retry with the newer (& quieter) CoolerMaster 120mm again to see if the MB will regulate it's speed as it should. I bought it thinking when I wasn't pushing the CPU the PC would be relativity quiet. But, while rendering, the fan would kick into HI speed. I think it's stuck on LOW & I believe this to be the reason I've been seeing higher temps (5-6C).
My System SpecsSystem Spec
18 May 2011   #65
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by GARoss View Post
I used 1 hour of AVCHD & HDV video for 2 separate test renders. Based of the results of the Vegas render, I figured a 1 hour HDV video to take about 3 hours to render. All I can say is video LOVES Intel i5 Sandy Bridge. It rendered the HDV 1 hour video in 88 minutes. It was rendering so fast that the preview screen was black, meaning too many frames to show. AVCHD (H.264 or Mpeg4) was slower but under 2 hours. Temps maxed out @ 64C but remained mostly in the 61-63C range.

I will replace the Antec fan & retry with the newer (& quieter) CoolerMaster 120mm again to see if the MB will regulate it's speed as it should. I bought it thinking when I wasn't pushing the CPU the PC would be relativity quiet. But, while rendering, the fan would kick into HI speed. I think it's stuck on LOW & I believe this to be the reason I've been seeing higher temps (5-6C).
Based on this test, it looks to me like your are good to go for rendering with this heatsink with no further changes. 64 max is OK long term.

Re the fan: I know nothing about the Coolermaster, but it may not be capable of adjusting its speed, regardless of how it is connected.

What is its alleged RPM and how does that compare to the alleged RPM of the Antec fan on high?

Are noise levels OK by you with the Antec on high? If so, that's your fan. If not, you can certainly get quieter fans that move at least as much air at a fixed unadjustable RPM. The Coolermaster may be such a fan, I don't know. If not, any of several Scythe or Noctua fans would suffice. But if the Antec is OK, ride with it and be done.

Is the Coolermaster supposedly a "PWM" fan??

Can you run a render test with the Coolermaster?
My System SpecsSystem Spec
18 May 2011   #66
GARoss

Windows 7 64-bit
 
 

It is a PWM fan & is also used with Cooler Master Hyper 212 HS. Model # R4-BMBS-20PK-R0. Max is the same as the Antec, 2000rpm. I'll swap them & re-test.


Attached Thumbnails
Overclocking help; your suggestions, please.-coolermaster-120mm-fan.jpg   Overclocking help; your suggestions, please.-antec-3-speed-fan.jpg  
My System SpecsSystem Spec
18 May 2011   #67
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

I wouldn't expect significant differences in cooling between 2 fans of the same diameter spinning at the same RPM.

RE noise: When you get above 1000 rpm, you tend to hear a "whooshing" type noise from exhaust fans. That is not the fan, but rather air turbulence noise resulting from the air being blown through the grill structure. Any fan will do that, quiet fan or not. The only way to avoid that noise is to keep the rpm down to 800 or so or to remove that honeycomb grill structure that you probably have.

I haven't heard you recently comment on noise, so I'm guessing that the Coolermaster and Antec on high are both tolerable.

You might try a render with the Antec on medium or low to see if that makes much of a difference.

I'm not sure myself which fan headers should provide adjustable speeds on Gigabyte motherboards. I have read that PWM control on Gigabyte boards can be a bit shaky.

My intake and exhaust fans are fixed speed, not PWM, so I can't do any really do any PWM experimentation. My CPU fan does adjust speeds from circa 800 to circa 1500.
My System SpecsSystem Spec
18 May 2011   #68
GARoss

Windows 7 64-bit
 
 

Quote   Quote: Originally Posted by ignatzatsonic View Post
I wouldn't expect significant differences in cooling between 2 fans of the same diameter spinning at the same RPM.

RE noise: When you get above 1000 rpm, you tend to hear a "whooshing" type noise from exhaust fans. That is not the fan, but rather air turbulence noise resulting from the air being blown through the grill structure. Any fan will do that, quiet fan or not. The only way to avoid that noise is to keep the rpm down to 800 or so or to remove that honeycomb grill structure that you probably have.

I haven't heard you recently comment on noise, so I'm guessing that the Coolermaster and Antec on high are both tolerable.

You might try a render with the Antec on medium or low to see if that makes much of a difference.

I'm not sure myself which fan headers should provide adjustable speeds on Gigabyte motherboards. I have read that PWM control on Gigabyte boards can be a bit shaky.

My intake and exhaust fans are fixed speed, not PWM, so I can't do any really do any PWM experimentation. My CPU fan does adjust speeds from circa 800 to circa 1500.
Just booted with CM fan installed & here's what's happening. It just flutters! I mean it turns about a quarter turn, pauses & repeats - never completing a full turn much less a constant speed. Can this be controlled manually with BIOS? It is a 4 pin that plugs in PWR_FAN2 on the MB which is set to AUTO in BIOS. There's a 3-pin nearby but I'm not sure if that would work with a 4-pin.

I did a short render test with all cores @ 100% & temps reached 63C without rear fan working.
My System SpecsSystem Spec
18 May 2011   #69
ignatzatsonic

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit
 
 

Quote   Quote: Originally Posted by GARoss View Post

Just booted with CM fan installed & here's what's happening. It just flutters! I mean it turns about a quarter turn, pauses & repeats - never completing a full turn much less a constant speed. Can this be controlled manually with BIOS? It is a 4 pin that plugs in PWR_FAN2 on the MB which is set to AUTO in BIOS. There's a 3-pin nearby but I'm not sure if that would work with a 4-pin.

I did a short render test with all cores @ 100% & temps reached 63C without rear fan working.
I'm not sure. It may be outright defective or it may be because it is a PWM fan trying to operate on an incompatible header?

I bought fixed speed low noise fans to avoid complications like that. I had read of possible PWM issues and knew if I stuck with the right fan that I would have both low noise and adequate cooling.

In your shoes, I would avoid the Coolermaster if I couldn't get it adjusting speeds easily. I don't think you have any bad BIOS settings re fans, but you might try a "non-auto" setting as a trial. No reason to use the Coolermaster unless the Antec is either too loud or doesn't cool well enough. As I said, I would expect Antec on high and Coolemaster to cool about equally.

Your test without exhaust fan further implies that the choice of exhaust fan isn't critical.

Will the Coolermaster spin without stuttering on ANY header?
My System SpecsSystem Spec
18 May 2011   #70
GARoss

Windows 7 64-bit
 
 

Quote   Quote: Originally Posted by ignatzatsonic View Post
Will the Coolermaster spin without stuttering on ANY header?
It's now spinning very slowly; I doubt if it's at the minimum of 600rpm. I'm reading up on MB manual settings.
My System SpecsSystem Spec
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 Overclocking help; your suggestions, please.




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