Amd A8-3850 cpu Max Tempertaure?

[jonabuckle]

Hi, my query is about Amd A8-3850 cpu Max temperature and voltage.
I have searched everywhere but cannot get this information.
The Amd website url: http://products.amd.com/en-us/DesktopAPUDetail.aspx?id=18
also does not give the information.
The reason i am asking is because my cpu temperature goes beyond 60 degress celsius when on load and ai suite asus utility keeps warning me! [motherboard : asus F1A75M-pro]. I would like to know what is normal load temperature for this cpu using stock cooling

Thanks in advance.

 

[dma0991]

60C is considered quite high for an AMD processor. Your normal load temperature should be less than 60C but if it is not then get a third party cooler instead. How well your stock cooler works depends on whether you've mounted it properly and ambient temps has a big influence on your idle and load temps.

 

[Rvenger]

60C is considered quite high for an AMD processor. Your normal load temperature should be less than 60C but if it is not then get a third party cooler instead. How well your stock cooler works depends on whether you've mounted it properly and ambient temps has a big influence on your idle and load temps.

It seems these Llano chips do run hot. I have seen mine hit in the 60c range with ease under load. I have an after market cooler and temps never changed a bit.

 

[jonabuckle]

Sorry folks i had left the bios at asus default settings. The cpu Vcore voltage was set by asus at 1.4125v. I reduced it to 1.225v. After that my load temperature for cpu dropped to 52 degrees celsius and the system is also stable.

Many thanks to Mothergoose729 for http://forums.anandtech.com/showthread.php?p=32227844

That saved me a lot of time and effort by giving me a stable voltage

Many thanks to dma0991 for confirming that 60 degrees is not normal for cpu

 

[dma0991]

It seems these Llano chips do run hot. I have seen mine hit in the 60c range with ease under load. I have an after market cooler and temps never changed a bit.

Maybe there might be something amiss with your Llano rig because HWC did state that Llano runs pretty cool.

AMD are known for making cool-running processors, and the A-series APUs appear to be no different. Our A8-3850 sample was downright chilly when idle, and barely warmed up when we were fully loading the integrated GPU. Even when both CPU and GPU portions where loaded, the temperatures never even reached 45°C.

@jonabuckle
The Llano chips does have higher than needed voltages probably to increase the probability of a good chip during binning. The lower voltages should be no problem in terms of stability.

 

[Rvenger]

Maybe there might be something amiss with your Llano rig because HWC did state that Llano runs pretty cool.


@jonabuckle
The Llano chips does have higher than needed voltages probably to increase the probability of a good chip during binning. The lower voltages should be no problem in terms of stability.

Being that I reseated the HSF 5 times and upgraded the cooler and still hit 60c. (28c Idle) I think not. The only way for me to drop the temps were to undervolt it from the stock voltage of 1.425v to 1.35v

 

[jonabuckle]

dma0991 the review that you had quoted from www.hardwarecanucks.com does not use the stock hsf supplied with the processor.
To quote " For the temperature testing, since we were not given a default cooler from AMD, we used a Thermalright Ultra-120 Extreme with a Thermalright TR-FDB-1600 fan."

Unfortunately my system wasnt stable at 1.225v. I am going to try SLK suggestion and attempt 1.35v

 

[dma0991]

dma0991 the review that you had quoted from www.hardwarecanucks.com does not use the stock hsf supplied with the processor.
To quote " For the temperature testing, since we were not given a default cooler from AMD, we used a Thermalright Ultra-120 Extreme with a Thermalright TR-FDB-1600 fan."

Unfortunately my system wasnt stable at 1.225v. I am going to try SLK suggestion and attempt 1.35v

Looks like I missed a small part of the review but even without a aftermarket heatsink the Llano load temps with a stock cooler should be about 60C +- 10C. Anything less than 60C should be just fine assuming that it would be below 60C @ 1.35V.

 

[Rvenger]

Looks like I missed a small part of the review but even without a aftermarket heatsink the Llano load temps with a stock cooler should be about 60C +- 10C. Anything less than 60C should be just fine assuming that it would be below 60C @ 1.35V.

Also you need to consider that they are probably using a test bed and not a case so the temps would be much lower in an open ventilated room with a nice cooler. I bet if I took my mobo out of the case, it would run in the high 40s, low 50s under load.

I think Llano's max safe temp is around 80c

 

[jonabuckle]

An intresting bit of info that CPUID hardware monitor saved to text file when asked to save monitoring data.

VID range 0.450 V - 1.412 V
P-State FID 0xD - VID 0x0B - IDD 19 (29.00x - 1.412 V)
P-State FID 0xA - VID 0x0E - IDD 17 (26.00x - 1.375 V)
P-State FID 0x7 - VID 0x12 - IDD 15 (23.00x - 1.325 V)
P-State FID 0x4 - VID 0x16 - IDD 13 (20.00x - 1.275 V)
P-State FID 0x10B - VID 0x1A - IDD 12 (18.00x - 1.225 V)
P-State FID 0x20C - VID 0x1F - IDD 9 (14.00x - 1.162 V)
P-State FID 0x206 - VID 0x24 - IDD 7 (11.00x - 1.100 V)
P-State FID 0x308 - VID 0x2A - IDD 6 (8.00x - 1.025 V)

It is strange that AMD does not give max temp and voltage range on its site for APU. http://products.amd.com/en-us/DesktopAPUDetail.aspx?id=18

 

[dma0991]

It is strange that AMD does not give max temp and voltage range on its site for APU.

That is one of the biggest issue I have with AMD's website that they do not provide necessary information like Ark Intel does. From what I can tell based on what I've seen before with AMD processors, 60C Tcase max and 1.5V Vcore is fine although 1.5V is quite high considering that I've seen some AMD Athlon II's ranging from 1.2-1.3V.

 

[Soulkeeper]

k10temp-pci-00c3
Adapter: PCI adapter
Cpu: +35.2°C (high = +95.0°C)
(crit = +95.0°C, hyst = +94.0°C)

nct6776-isa-0290
Adapter: ISA adapter
Vcore: +1.18 V (min = +0.90 V, max = +1.26 V)
+12V: +12.29 V (min = +10.85 V, max = +13.82 V)
AVCC: +3.39 V (min = +2.98 V, max = +3.63 V)
+3.3V: +3.38 V (min = +2.98 V, max = +3.63 V)
+5V: +5.04 V (min = +4.52 V, max = +5.52 V)
3VSB: +3.31 V (min = +2.98 V, max = +3.63 V)
Vbat: +3.30 V (min = +2.70 V, max = +3.46 V)
Case Fan: 1335 RPM (min = 600 RPM)
CPU Fan: 1638 RPM (min = 600 RPM)
CPU: +35.0°C (high = +55.0°C, hyst = +35.0°C) sensor = thermistor
MB: +32.0°C (high = +50.0°C, hyst = +30.0°C) sensor = thermistor


same setup as you, just I have the mini-itx version of your board
undervolted on everything the bios will let me, ambient temperature is 21C
my 3850 becomes unstable at default clock if I lower the vcore below this, the NB seems stable all the way down to 1.05-1.10v ,,, but that's a relatively small portion of the die

Personally I wouldn't want to go above 1.5v
I don't even feel right above 1.35v on 32nm ...

1.6v sounds like something you'd pump thru a 180/130nm chip :/

 

[Soulkeeper]

Also I forgot to mention that i'm using a discreet video card, that could have a large impact on core temps ...

 

[jonabuckle]

I am currently using 26x multiplier [down from 29x]and 1.375v [down from 1.412v] for Vcore in the bios. This gives a max temperature of 58-59 degrees celsius at 100 % load and the temperature does not cross 60 the danger mark set by asus ai suite.

 

[jonabuckle]

Quoting from http://forums.amd.com/forum/messageview.cfm?catid=11&threadid=98342

"There is one main temperature that you need to identify: the Core temperature (also known as TCaseMax.) In AMD chips, there is a special diode inside the chip that measures the cpu's temperature with perfect accuracy. However, motherboards come with another thermostat that sits under the chip (also called TjunctionMax). This temperature does not tell you what the chip's temperature really is, and is often confused with Core Temperature. To add to this confusion, your motherboard may have a host of other thermostats that are reading temperatures from all over the place. You may need to get other utilities that read other thermostats just to eliminate them."

 

[jonabuckle]

Finally settled on 1.3v for Vcore and stock multiplier 29x. Gives a max temperature for cpu of 56 degrees celsius.

 

[Zap]

This gives a max temperature of 58-59 degrees celsius at 100 % load

So what are you using the computer for that makes it run 100% load all the time? If it is just in synthetic torture test software, find out what your temperatures do under your normal conditions.

 

[jonabuckle]

Idle temps are fine at 36 degrees celsius. I am not running test software like prime. I am only running normal software like video conversion, antivirus scan to test the load temp. The default 1.412v for Vcore set in the asus bios is i think the highest it should be set. I am running it at 1.275v Vcore and load temps are 55 degrees for cpu well below the 60 degrees max limit.

 

[Soulkeeper]

Idle temps are fine at 36 degrees celsius. I am not running test software like prime. I am only running normal software like video conversion, antivirus scan to test the load temp. The default 1.412v for Vcore set in the asus bios is i think the highest it should be set. I am running it at 1.275v Vcore and load temps are 55 degrees for cpu well below the 60 degrees max limit.

Is this with the retail HSF ?
what are your ambient temps ?

 

[jonabuckle]

It is with stock hsf. The ambient temp for my location is max 35 degrees celsius.

 

[jonabuckle]

Check out this article on undervolting Llano:

http://www.brightsideofnews.com/new...olting-reduce-power-consumption-by-3225!.aspx

Quoting :

"You have to know that the default voltage at 2.9GHz is 1.424V, which is quite a lot considering that Llano is manufactured on a 32nm SOI process. For comparison, Intel's 32nm Core i3-2100 pulls in 1.1 Volts."

"We toyed around a bit and finally achieved a stable -0.275V undervolt. When we set the voltage offset to -0.3V the system crashed with a blue screen."

"Undervolting from 1.42 to 1.13V resulted in significant decrease of power consumption"

"As you can see on the CPU-Z screenshot, with this setting, the CPU cores were operated with only 1.136V (note that due to how VIDs work, this is actually -0.288V)"

 

[jonabuckle]

This article deals with undervolting a6-3650:

http://www.nordichardware.com/news/...-a6-3650-lowers-energy-consumption-by-25.html

Quoting:

"Besides our overclocking tests and regular energy consumption tests we decided to try and undervolt the new mid-range processor. AMD is pretty generous with the voltage of the 32nm architecture and AMD A6-3650 has a CPU voltage at 1.4V. In our tests we lowered this to 1.2V without lowering frequencies or losing stability. We also dropped the APU VDDP voltage from 1.1V to 0.95V and our regular energy consumption tests."

"We will share more in the future, but in our CPU test with load in Cinebench we measured an improvment of over 25% in the total system energy consumption, which means we have reduced the energy costs by 25% if a Llano system without losing any performance."