AMD cpus and their low heat threshold ?

Dicehunter · 19 Aug 2011 at 12:51

Ive owned Intel and AMD cpus and im quite baffled as to why Intel chips can quite happily peform under high temps and AMD chips should be kept under 64'c or somewhere around there even when under load.
Shouldnt they have a higher resistance ?

Jamiman · 19 Aug 2011 at 13:08

I've never had that problem.

Orcvader · 19 Aug 2011 at 13:11

Intel temps are the actual core temps, while AMD temps is read from the socket. Hence the actual AMD core temp will usually be higher. If both CPUs had the temp sensors in the same place, I would imagine the heat threshold would be the same.

EniGmA1981 · 19 Aug 2011 at 13:22

Stupid that AMD don't read the temp from the core itself IMO makes much more sense than giving the 'socket' temperature...

Hagar · 19 Aug 2011 at 13:26

EniGmA1981 said:
Stupid that AMD don't read the temp from the core itself IMO makes much more sense than giving the 'socket' temperature...

..........not really, as long as you know the limit and are reading the correct temperature sensor.

Does not limit the overclock for a particular cpu.

jak731 · 19 Aug 2011 at 13:32

But the temperature difference between the socket and cpu die will vary according to heat output and cooling used, on die sensors make much more sense. IIRC amd does have on die sensors but they don't work properly on the phenom IIs.

Martini1991 · 19 Aug 2011 at 13:36

Jamiman said:
I've never had that problem.

It's not a problem, it's just a fact? :confused:

MasterPlan1 · 19 Aug 2011 at 13:39

My 1055T runs at 16-17 degrees idle, 28 load with an A70.

My Q6600 ran at 32 degrees idle, and 50 load with a CoolIT ALC.

It's all relative really.

Martini1991 · 19 Aug 2011 at 13:43

MasterPlan1 said:
My 1055T runs at 16-17 degrees idle, 28 load with an A70.

My Q6600 ran at 32 degrees idle, and 50 load with a CoolIT ALC.

It's all relative really.

/facepalm
No it doesn't.

jak731 · 19 Aug 2011 at 13:43

I would expect the actual idle temp to be at least 10 degrees above ambient, you lose about 5 degrees just through the TIM. So you live in a freezing cold house or the reported temp is way off.

Martini1991 · 19 Aug 2011 at 13:44

jak731 said:
I would expect the actual idle temp to be at least 10 degrees above ambient, you lose about 5 degrees just through the TIM. So you live in a freezing cold house or the reported temp is way off.

He's monitoring the wrong temperature.
Which is why AMD need to sort this on BD.

eddyr · 19 Aug 2011 at 14:17

The intel core sensors are not accurate through the entire temperature range, they dont scale linearly and aren't calibrated. At least that was the case with the core2 cpu's. They dont market their cpu's as having accurate core temperature reporting. There is no real motivation to improve, why waste money on perfecting something that is there to simply monitor the aproach to a temp threshold, and those that are interested in reliable/accurate temp reporting (us) are a very small segment of the market.

At least this was the case when I spent time reading up on this 2/3 years back. For all I know they may have introduced better sensors in the i7 onwards. I'd still take the readings with a hefty pinch of salt.

Martini1991 · 19 Aug 2011 at 14:21

eddyr said:
The intel core sensors are not accurate through the entire temperature range, they dont scale linearly and aren't calibrated. At least that was the case with the core2 cpu's. They dont market their cpu's as having accurate core temperature reporting. There is no real motivation to improve, why waste money on perfecting something that is there to simply monitor the aproach to a temp threshold, and those that are interested in reliable/accurate temp reporting (us) are a very small segment of the market.

At least this was the case when I spent time reading up on this 2/3 years back. For all I know they may have introduced better sensors in the i7 onwards. I'd still take the readings with a hefty pinch of salt.

Because the AMD Thuban sensor will report a safe temperature when it could be at a dangerous level.
62c on my old 1055T would have been about 80c in reality, which is 18c over the limit.

eddyr · 19 Aug 2011 at 14:39

Martini1991 said:
Because the AMD Thuban sensor will report a safe temperature when it could be at a dangerous level.
62c on my old 1055T would have been about 80c in reality, which is 18c over the limit.

Huh, didn't know that. Definitly something for AMD to work on.

Realise my post seems very intel targeted, but it was more of an open FYI, and advice to be generally distrusful of temp readings.

Duke · 19 Aug 2011 at 14:56

MasterPlan1 said:
My 1055T runs at 16-17 degrees idle

lol

arknor · 19 Aug 2011 at 16:19

Martini1991 said:
Because the AMD Thuban sensor will report a safe temperature when it could be at a dangerous level.
62c on my old 1055T would have been about 80c in reality, which is 18c over the limit.

the temprature of an individual core doesnt really matter do you think amd are stupid or something? do you realise how large the RND budgets are? do you realise the QA is not done by some bloke in his bedroom?

Martini1991 · 19 Aug 2011 at 16:34

arknor said:
the temprature of an individual core doesnt really matter do you think amd are stupid or something? do you realise how large the RND budgets are? do you realise the QA is not done by some bloke in his bedroom?

I'm sorry what?
AMD's "core temps" are all the same according to core temp, that's wrong from the get go. The actual reading is wrong too.. Thuban's can report under ambient, explain that?

To get the true reading you look at "CPU temperature".
What I think they've done is stupid. On Deneb/Callisto the issue wasn't as apparent, thuban was horrendously off.

pmc25 · 19 Aug 2011 at 17:12

Martini1991 said:
Because the AMD Thuban sensor will report a safe temperature when it could be at a dangerous level.
62c on my old 1055T would have been about 80c in reality, which is 18c over the limit.

This is misinformation. The first few batches had bad sensors ... the one I own and all the ones I've seen in acquaintences rigs, who've bought them recently, report in line with expected temperatures.

Martini1991 · 19 Aug 2011 at 17:23

pmc25 said:
This is misinformation. The first few batches had bad sensors ... the one I own and all the ones I've seen in acquaintences rigs, who've bought them recently, report in line with expected temperatures.

It depends on the CPU. I've seen some Thubans be fine and then I've seen some Denebs be slightly whack.
It's not misinformation, it's still the wrong sensor, I'm giving an example why it's a problem.

gareth170 · 19 Aug 2011 at 18:15

even amd themselves have said to ignore the core temp and to monitor the cpu temp which amd bases all they max safety temps on....

hence why most oc/monitoring utilitys such as AI Suite II show the cpu temp only, not core temp.