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Thread: AMD Kaveri Refresh A10-7870K Apu arrives. Reply to Thread

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  Topic Review (Newest First)
05-04-2019 09:26 PM
drmrlordx @bmgjet

Might as well keep it running for as long as possible at that voltage, just to see what happens.

05-04-2019 04:22 PM
bmgjet Just want to add, People that were worried about the break down voltage.
Mines been going strong 1.58V 4.8ghz since I got it would be coming up 4 years soon.
05-04-2019 04:12 PM
Himo5 Some of these old threads are still chugging along, although there are no new posts for years on end. The thread that PhRe4K started in 2014, 'Athlon 860K, any one picking it up?' is still getting about 6000 views a year while even this one gets about 2000.
05-04-2019 07:14 AM
drmrlordx Gotta give you props for keeping up with this old thread. Might still help a few people out there with these old chips. Mine is long gone to another home.
04-26-2019 04:00 AM
Himo5 I just noticed that I couldn't open spoilers in Post 355 which made all the tables inaccessible, so if anyone is still interested, I've edited them out.
06-02-2017 12:46 PM

I think it really is a matter of courses for horses - it depends what software you are running. This chart for the A10-7870K of the effect of increasing CPU, RAM or GPU frequency in a range of benchmarks shows each of these frequencies can produce a substantial overclock, depending on the benchmark, reaching maximums of 122%, 146% and 134% for CPU, RAM and GPU respectively.


The table is based on a project I ran in August 2015,  involving 1404 runs of 39 benchmarks producing 2880 results where the detailed results can be examined here.

06-02-2017 11:46 AM
drmrlordx I gained very little on my 7870k going past 900 MHz iGPU speed. Going for more speed made since on my A10-7700k with the reduced shader count, but with 512 shaders . . . not so much.
05-31-2017 11:09 PM
Sanxel Thanks! I actually have found some recommendation on this forum, that basically more than 960Mhz not worth it much, and that was for 2400Mhz memory. So for 1866Mhz it's even less, I guess.
05-31-2017 05:25 PM

As an example, the ASUS A88X-Pro motherboard allows the following Manual GFX Frequency straps for the A10-7890K:


With 866GHz(Auto), 975GHz(Turbo) and 1040GHz(Extreme) as the three standard settings.


Which of these straps you can set is not dependent on the speed of your RAM although there are plenty of apps that will run faster withe faster RAM.


When you select these straps the ASUS BIOS automatically adjusts the VDDNB voltage: 1.225V for anything below 975MHz; to 1.25V for 975MHz(Turbo); to 1.3375V for 1040MHz(Extreme); and to 1.3875MHz for 1114MHz and above.


Once you go above 975GHz, however, you definitely need to set Load Line Calibration and other VRM controls to at least medium settings.


Another way of getting the most out of iGpu on ASUS motherboards is to increase the UMA Frame Buffer Size option in Advanced Menu>NB Configuration> to its 2G maximum.


Of course, the operating frequencies for GPU, RAM, CPU and NB all depend on the BClk, or APU Frequency, as follows:
Cpu = Apu * CpuRatio  (CpuRatio = 8.0..63.0 x 1.0) (Apu = 90..300)
Ram = Apu * Mem / 100 (Mem = 1066/1333/1600/1866/2133/2400)
Gpu = Apu * Gfx / 100 (Gfx = 445..866/917/975/1040..1950)
NB  = Apu * Nb  / 100 (Nb  = 400..6300 x 100)


Whatever you set in the BIOS on ASUS FM2+ boards you need to watch for any automatic changes to voltage settings. Always repost into the BIOS and check the voltages. If you find them changed then switch from Auto to Offset mode and set a minimum offset from your desired setting.


I did a Voltage Table for the A10-7890K.

05-31-2017 02:12 PM
Sanxel I have a similar APU A10-7890k, I want to overclock it's GPU, but as is known it's fully limited by RAM speed. So the question is what reasonable max GPU clock is enough for dual channel memory 9-9-9-27 1866mhz? Thanks.
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