Is A10-7860K a 65W or 95W TDP APU processor?

[mtcn77]

So, do you think steady state overclocking is necessary? Newer forms of APUs with Ryzen cores will come with Sense M.I. and present less of a challenge for users in order to establish a solid base, but I have seen skipping only gone with cpb(turbo)/powernow turned off.

 

[waltchan]

No, I'm just worried whether the 65W heatsink originally came from A6-7400K retail box is sufficient size for it or it's too small. I use a EVGA 450 BV Bronze power supply, and the power supply fan is running faster than normal at load peak. There's also a very small chance that AMD might have lied on the specs or accidentally didn't test it correctly, and A10-7860K is really a 95W APU the whole time. Confused... why can't they call it a A10-7860Ke, with "e" at the end as low power.

 

[mtcn77]

They don't necessarily market it for sustained turbo speeds, so no point in pursuing that if you want it to run quiet/stable at the same time.

 

[mtcn77]

One such user says stuttering is gone at P3 levels set at 3.6GHz@1.375v. Any higher, you will hit either the power threshold(tdp), or heat(temperature) above this point.
The user probably has some more issues on the heat-side because 1.375v is terribly high for 3.6GHz - maybe for stability.
http://www.overclock.net/t/1588994/...ng-geapm-steamroller-apus/90_30#post_25812457

 

[amd6502]

No, I'm just worried whether the 65W heatsink originally came from A6-7400K retail box is sufficient size for it or it's too small. I use a EVGA 450 BV Bronze power supply, and the power supply fan is running faster than normal at load peak. There's also a very small chance that AMD might have lied on the specs or accidentally didn't test it correctly, and A10-7650K [corrected:A10-7860k] is really a 95W APU the whole time.

The 'k' designation is because the CPU clock multipliers are unlocked. It'd be safe to run on a 45W cTDP on an awful cooler like the Kaveri A6's. Maybe even the default 65W TDP, although you can be sure thermal throttling will kick in. You end up degrading the lifetime of the silicon if you run it near the thermal limits ~70C; so totally not worth it. (The only thing that cooler is good for is to salvage the 70mm PWM fan for case cooling, and to toss the aluminum scrap in the recycling bin or find some use for it as a spare heat spreader.)

I believe power consumption of the APU can be greater than the TDP rating for some time during turbo clocks (or when iGPU and CPU is under full load). It only exceeds the TDP for a fixed amount of time (under 15 minutes).

 

[mtcn77]

The 'k' designation is because the CPU clock multipliers are unlocked. It'd be safe to run on a 45W cTDP on an awful cooler like the Kaveri A6's. Maybe even the default 65W TDP, although you can be sure thermal throttling will kick in. You end up degrading the lifetime of the silicon if you run it near the thermal limits ~70C; so totally not worth it. (The only thing that cooler is good for is to salvage the 70mm PWM fan for case cooling, and to toss the aluminum scrap in the recycling bin or find some use for it as a spare heat spreader.)

I believe power consumption of the APU can be greater than the TDP rating for some time during turbo clocks (or when iGPU and CPU is under full load). It only exceeds the TDP for a fixed amount of time (under 15 minutes).

I kindly disagree. You're at the electromigration limit when at 68C and +1.4875v. I can run at 68c daily and not worry about a thing since the voltage is a much chillier 1.24375v. The stock cooler at 2675rpm is really silent.
PS: A bit more tinkering and I noticed I was using too much voltage. Any setting above 1.275v with moderate LLC is throttling intermittently. I can manage 4.3GHz in this range. 4.6GHz at 1.4v is possible, only because I'm not using more than two cores due to CMT conflict.

 

[waltchan]

I've decided to use the unused big red heat sink for A10-5800K I just ordered today that was made in the final month of April 2014. Sounds appropriate. I assume Trinity runs hotter than Godavari, right? Lots of great deal with Trinity APUs, lately.

 

[mtcn77]

Mine throttle when cTDP for cores and total package reach 55/65 watts respectively. The stock cooler can manage 4.5GHz@1.306v, but I wouldn't dare as much if the apu was online. In this regard, I think cTDP doesn't matter so much, as soon as these limits are reached the cores start throttling.
Also, the temperature limit for electromigration is 62C, not 68C as I said previously.