A10-7870K Disected For Hidden Improvements

[Opcode]

Source

 

The other day, fifth-generation A series APUs (Godavari) was released. Godavari, also referred to as "Kaveri Refresh" is a minor change model with an enhanced operating clock than the existing Kaveri based products, were information states "TIM between the die and the heat spreader has been changed to solder".

 

Left: A10-7870k Right: A10-7700k

 

Motherboard ASUS A88X-PRO

Memory DDR3-2133 4GB × 2 (11-11-11-31,1.65V)

CPU Cooler CRYORIG R1 Ultimate

Compound Prolimatech PK-3

Case No Case

Stress Test Prime95 v28.5 (Small FFTs)

Monitoring Software HWMonitor 1.27 (CPU-Package)

Room Temperature 27.0±0.5℃

 

The graph below summarizes the results of the tests.

 

 

Looks like AMD switched from TIM to solder which warranted a pretty hefty thermal improvement. The A10-7870K should make for better overclocking than Kaveri. Securing higher frequencies at lower volts. Which is important as these chips have diminishing returns after 1.45V - 1.475V depending on leakage.

[EarthboundHero]

Nice, my 7850K had no OC room at all.

[itsmyjobtoknow]

Lovely...more of a reason for me to consider this for one of my upcoming build

[The Benjamins]

I have a mineral oil cooled A10-7850k at 4.2GHz CPU and 1000 MHz GPU, I I could get it higher then that would be awesome.

[Dietrichw]

My 7850k is at 4.4GHz 1.45v. I could never get 4.5 stable enough

[Ostwind]

I have a mineral oil cooled A10-7850k at 4.2GHz CPU and 1000 MHz GPU, I I could get it higher then that would be awesome.

I demand pictures

[The Benjamins]

I demand pictures

http://linustechtips.com/main/topic/217272-mineral-oil-cooled-m-itx/

 

those are old pics, replaced rad with thicker rad.

and changed how tubing is laid out, 1 fitting was leaking so I didnt replaced it just removed it.

[Opcode]

My 7850k is at 4.4GHz 1.45v. I could never get 4.5 stable enough

Securing 4.6 GHz should be more achievable with these chips. They also ship with a beefier stock cooler in which I also find appealing. As many would need to immediately switch to aftermarket cooling in most cases to run the chip out of the box at acceptable temperatures.

 

Left: A10-7870k Right: A10-7850k

 

Based on my experience with AMD products the right cooler is their standard 95w TDP cooler and the left is their 125w TDP cooler. I have one much similar to it sitting in my closet that AMD sent me before inquiring about an AIO. So it sits as a backup once my AIO goes kaput. 

[Ostwind]

http://linustechtips.com/main/topic/217272-mineral-oil-cooled-m-itx/

 

those are old pics, replaced rad with thicker rad.

and changed how tubing is laid out, 1 fitting was leaking so I didnt replaced it just removed it.

Have you looked to see the averge GPU overclocks for the 7850k? I'm more interested in how much of an effect the tim replacement would have on GPU performance than CPU performance.

[Dietrichw]

Securing 4.6 GHz should be more achievable with these chips. They also ship with a beefier stock cooler in which I also find appealing. As many would need to immediately switch to aftermarket cooling in most cases to run the chip out of the box at acceptable temperatures.

-snip-

Based on my experience with AMD products the right cooler is their standard 95w TDP cooler and the left is their 125w TDP cooler. I have one much similar to it sitting in my closet that AMD sent me before inquiring about an AIO. So it sits as a backup once my AIO goes kaput.

I used to use that cooler as I got it for free when I built a computer with an 8350 for a friend. I got 4.4GHz with it but it got up to the 60 degrees in a h440. With water cooling it stays under 40 degrees under load. Ambient room temp is 26 now. When I was using the stock 8350 cooler it was much lower (under 20)

[The Benjamins]

Have you looked to see the averge GPU overclocks for the 7850k? I'm more interested in how much of an effect the tim replacement would have on GPU performance than CPU performance.

the 7850k is rated at 720MHz, and the 7870k is 800MHz. I can get it to 900-1000 easily, the CPU portion seems to put out more heat. but my OC is balanced to CPU, GPU, MEM.

I am not sure of what others got for the GPU.

I think the 7870k can get 4.4-4.6 CPU and 1000-1100 GPU at the same time easily.

[KenJimmY]

...

 

Left: A10-7870k Right: A10-7850k

Left FX 8350 cooler Right FX 6300 cooler ; interesting

[cesrai]

This is a plus.