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AMD A10-7890K User Report

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post #1 of 24 (permalink) Old 04-23-2016, 04:25 AM - Thread Starter
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Here's my voltage table for the A10-7890K, now that Asus have released new BIOS versions for the A88X-Pro(2603) and Crossblade Ranger(1802) to manage its new protocols. There should be enough info if anyone wants to compare it with other AMD processors.

+------------------------------------------------------------------------------------------+
|      Table Of Minimum Voltage Required To Run Application At Specified CPU Speed         |
+------------------------------------------------------------------------------------------+
|  Processor: AMD A10-7890K AD789KVXD144JC-JA1604PGS Voltage_Increment(00)=1.5V            |
|  Volt Limits: AISuite3(+28=1.675V/+40=1.75V) BIOS(+18=1.6125V/+38=1.7375V)               |
|                 (Showing results below AI Suite III Voltage Limits)                      |
+------+-----+------------------------+----------------------------------------------------+
|  CPU | OC  |  Low Load (SuperPi-1M) |          High Load ([email protected])                |
| Freq |Code +---------+-----+--------+---------+-----+------+-------+-----+----+----+-----+
|(Ratio|     |   Cpu   | -/+ |        |   Cpu   | -/+ | Max  | Max   |Apprx| Max| Src| Max |
| *Apu)|     |  Volts  | IncV|  Secs  |  Volts  | IncV| Watts| Volts | IncV| °C | °C | Rpm |
+------+-----+---------+-----+--------+---------+-----+------+-------+-----+----+----+-----+
| 3500 | L1a | 1.1125  | -62 | 20.515 | 1.14375 | -57 | 34.1 | 1.120 | -60 | 31 | 19 | 591 |
| 3600 | L1a | 1.11875 | -61 | 20.297 | 1.1625  | -54 | 35.1 | 1.136 | -58 | 30 | 19 | 592 |
| 3700 | L1a | 1.14375 | -57 | 19.578 | 1.19375 | -49 | 38.6 | 1.176 | -51 | 32 | 19 | 591 |
| 3800 | L1a | 1.16875 | -53 | 19.109 | 1.21875 | -45 | 40.5 | 1.2   | -48 | 33 | 19 | 590 |
| 3900 | L1a | 1.2     | -48 | 18.672 | 1.25    | -40 | 44.2 | 1.224 | -44 | 33 | 20 | 590 |
| 4000 | L1a | 1.20625 | -47 | 18.250 | 1.2625  | -38 | 47.1 | 1.240 | -41 | 33 | 20 | 592 |
| 4100 | L1a | 1.225   | -44 | 17.828 | 1.29375 | -33 | 52.7 | 1.272 | -36 | 35 | 20 | 592 |
| 4200 | L1a | 1.275   | -36 | 17.469 | 1.33125 | -27 | 58.9 | 1.312 | -30 | 37 | 20 | 591 |
| 4300 | L1a | 1.2875  | -33 | 17.360 | 1.36875 | -21 | 63.2 | 1.352 | -23 | 34 | 20 | 780 |
| 4400 | L1b | 1.35    | -24 | 17.172 | 1.425   | -12 | 73.2 | 1.408 | -14 | 36 | 21 |1070 |
| 4500 | L1b | 1.36875 | -21 | 16.844 | 1.45625 | -05 | 77.5 | 1.44  | -09 | 36 | 20 |1070 |
| 4600 | L1b | 1.4125  | -14 | 16.625 | 1.5125  | +02 | 88.4 | 1.496 | +00 | 38 | 20 |1105 |
| 4700 | M1c | 1.45625 | -07 | 16.328 | 1.55    | +08 | 97.6 | 1.536 | +06 | 39 | 20 |1129 |
| 4800 | M1c | 1.5     | +00 | 16.016 | 1.625   | +20 |130.3 | 1.632 | +22 | 48 | 22 |1271 |
| 4900 | M1c | 1.58125 | +14 | 15.657 |         |     |      |       |     |    |    |     |
+------+-----+---------+-----+--------+---------+-----+------+-------+-----+----+----+-----+
| Guide to Table:                                                                          |
| -/+ Voltage increments -96 to 0 to +48 by 0.00625V:                                      |
|                        -96=0.9V - 00=1.5V - +48=1.8V                                     |
| Src °C: Temperature in front of the Cpu Heatsink                                         |
+-INSTALLATION-----------------------------------------------------------------------------+
| Motherboard: Asus A88X-PRO                                                               |
| PSU:Seasonic SS-850-KM3;                                                                 |
| Ram:G Skill TridentX 2666 2x4Gb CL11-13-13-35 1.65V                                      |
| CPU Heatsink:Phanteks PH-TC14PE                                                          |
| Fans:3 x FF4-140 F.Vardar PWM 2500rpm                                                    |
| O/S:MS W8.1 Pro                                                                          |
+-OC Codes---------------------------------------------------------------------------------+
|  [VRM Power Setting][BIOS Setting]                                                       |
|  (Note about PowerNow/CPB/C6: Should be On above 4700MHz and Off below 1.35V)            |
+---------------------------+-------+-------+-------+-------+-------+------+-------+-------+
| VRM Control Setting       | L1    | M1    |       |       |       |      |       |       |
+---------------------------+-------+-------+-------+-------+-------+------+-------+-------+
| Cpu Load Line Calibration | Reg   | Med   |       |       |       |      |       |       |
| Cpu Current Capability    | 100%  | 120%  |       |       |       |      |       |       |
| Cpu Power Phase Control   | Opt   | M=Med |       |       |       |      |       |       |
| Nb Load Line Calibration  | Reg   | Med   |       |       |       |      |       |       |
| Nb Current Capability     | 100%  | 110%  |       |       |       |      |       |       |
| Cpu Power Thermal Control | 125°C | 130°C |       |       |       |      |       |       |
| Cpu Voltage Frequency     |A=Dis. |F=320Kz|       |       |       |      |       |       |
| Cpu Power Duty Control    |TProbe |TProbe |       |       |       |      |       |       |
+---------------------------+-------+-------+-------+-------+-------+------+-------+-------+
| BIOS Setting              |   a   |   b   |   c   |       |       |      |       |       |
+---------------------------+-------+-------+-------+-------+-------+------+-------+-------+
| Memory Frequency          | 2400  | 1866  | 1866  |       |       |      |       |       |
| GFX Frequency             |  975  |  866  |  780  |       |       |      |       |       |
| AMD PowerNow Function     |  Off  |  On   |  On   |       |       |      |       |       |
| CPB Mode                  |  Off  | Auto  | Auto  |       |       |      |       |       |
| C6 Mode                   |  Off  |  On   |  On   |       |       |      |       |       |
| Asus Q-Fan Profile        | Silent| Std   | Std   |       |       |      |       |       |
+---------------------------+-------+-------+-------+-------+-------+------+-------+-------+

This chip seems to have been set to respond to the system more deliberately than other chips: I've never heard before of the way it responds to PowerNow/CPB/C6 settings, for example, where it simply won't post above 4700MHz when they are not enabled nor below about 1.35V when they are. I have also found a ceiling around 4680MHz that can't be got above without increasing the VRM Power Control settings to Medium.

 

There is also a question about what the default settings actually are: it is described as a '4.1GHz processor 4.3GHz Max' and said to have a 866MHz GPU clock, but when you set the Asus BIOS to Optimized Defaults you get 4200MHz and the GPU is set to Turbo-975MHz. Here are 3 AmdMsrTweaker screenshots showing the journey the 0x15 AMD family have been on since the A10-7850K showing the massive hike in P-States and probable reason for these new protocols:

 

With Kaveri and the A10-7870K I was able to at least validate 5GHz on one thread only without setting VCore above 1.6V but this chip requires at least 1.63V just to go long enough to crash - however, there was no question of running those chips stable at 4.8GHz and I have a suspicion that stability above 4.9GHz is possible above the Voltage Limits. I will attempt that when I run it in Athlon mode on my XBR board.

 

Once I've finished finding out what is possible with my best cooling solution I'll test my results against the Wraith before shifting to the XBR.

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post #2 of 24 (permalink) Old 04-23-2016, 05:15 AM
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What "new protocols"?
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post #3 of 24 (permalink) Old 04-23-2016, 05:28 AM - Thread Starter
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Ok then, observed effects. I never had to switch off PowerNow etc. to get lower voltages to work in the tables for the A10-7870K or 7850K or increase the VRM Power Controls to get above 4680MHz, or turn PowerNow etc. back on to get above 4700MHz. My impression is that this APU seems to fall short of the performance limits of its predecessors until you get a new BIOS or find a new setting so that it can then outdo them.

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post #4 of 24 (permalink) Old 04-23-2016, 05:46 AM
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I can't read this at all on mobile... It just looks like a mess of typewriter font and brackets to be honest.

But if you didn't already know, if you want the best gaming overclock then you want to push the iGPU far but keeping the voltage down, since high TDP APUs throttle their performance as they get closer to 125w.
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post #5 of 24 (permalink) Old 04-23-2016, 06:04 AM - Thread Starter
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Quote:
Originally Posted by Account Banned View Post

I can't read this at all on mobile... It just looks like a mess of typewriter font and brackets to be honest.

But if you didn't already know, if you want the best gaming overclock then you want to push the iGPU far but keeping the voltage down, since high TDP APUs throttle their performance as they get closer to 125w.

 

Sorry about that, I clean forgot about mobiles. Here's a plainer version of the results:


Low Load: SuperPi-1M
Cpu  :CpuVolts: IncV:Seconds
3500 :1.1125  : -62 : 20.515
3600 :1.11875 : -61 : 20.297
3700 :1.14375 : -57 : 19.578
3800 :1.16875 : -53 : 19.109
3900 :1.2     : -48 : 18.672
4000 :1.20625 : -47 : 18.250
4100 :1.225   : -44 : 17.828
4200 :1.275   : -36 : 17.469
4300 :1.2875  : -33 : 17.360
4400 :1.35    : -24 : 17.172
4500 :1.36875 : -21 : 16.844
4600 :1.4125  : -14 : 16.625
4700 :1.45625 : -07 : 16.328
4800 :1.5     : +00 : 16.016
4900 :1.58125 : +14 : 15.657

 

High Load: [email protected] minutes
Cpu  :CpuVolts: IncV:Watts : MaxV  :IncV :Temp:Amb :Fans
3500 :1.14375 : -57 : 34.1 : 1.120 : -60 : 31 : 19 : 591
3600 :1.1625  : -54 : 35.1 : 1.136 : -58 : 30 : 19 : 592
3700 :1.19375 : -49 : 38.6 : 1.176 : -51 : 32 : 19 : 591
3800 :1.21875 : -45 : 40.5 : 1.2   : -48 : 33 : 19 : 590
3900 :1.25    : -40 : 44.2 : 1.224 : -44 : 33 : 20 : 590
4000 :1.2625  : -38 : 47.1 : 1.240 : -41 : 33 : 20 : 592
4100 :1.29375 : -33 : 52.7 : 1.272 : -36 : 35 : 20 : 592
4200 :1.33125 : -27 : 58.9 : 1.312 : -30 : 37 : 20 : 591
4300 :1.36875 : -21 : 63.2 : 1.352 : -23 : 34 : 20 : 780
4400 :1.425   : -12 : 73.2 : 1.408 : -14 : 36 : 21 :1070
4500 :1.45625 : -05 : 77.5 : 1.44  : -09 : 36 : 20 :1070
4600 :1.5125  : +02 : 88.4 : 1.496 : +00 : 38 : 20 :1105
4700 :1.55    : +08 : 97.6 : 1.536 : +06 : 39 : 20 :1129
4800 :1.625   : +20 :130.3 : 1.632 : +22 : 48 : 22 :1271

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post #6 of 24 (permalink) Old 04-23-2016, 06:19 AM
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Are the power measurements provided by software?
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post #8 of 24 (permalink) Old 04-23-2016, 06:29 AM
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1.632V is completely bat **** crazy, considering that AMD has rated the breakdown voltage of the design to 1.4900V.

Definition of the breakdown voltage:
Quote:
Originally Posted by AMD 
Device functionality and reliability will be compromised when a device is operated outside the absolute maximum ratings. Furthermore, when a device is returned to within operating conditions the device may not work and its long term reliability will have been degraded.
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post #9 of 24 (permalink) Old 04-23-2016, 06:34 AM - Thread Starter
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If that is so then why is AmdMsrTweaker showing the P1 Turbo P-State as 44x at 1.5125V and P0 P-State as 44x at 1.5V?

Also, why has Asus set Voltage cautions and warnings to 1.675V/1.75V in AI Suite III and 1.6125V/1.7375V in the BIOS - and if you say these settings are meaningless, then why go to the trouble of making them different for each APU?

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post #10 of 24 (permalink) Old 04-23-2016, 08:12 AM
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Quote:
Originally Posted by Himo5 View Post

If that is so then why is AmdMsrTweaker showing the P1 Turbo P-State as 44x at 1.5125V and P0 P-State as 44x at 1.5V? Also, why has Asus set Voltage cautions and warnings to 1.675V/1.75V in AI Suite III and 1.6125V/1.7375V in the BIOS - and if you say these settings are meaningless, then why go to the trouble of making them different for each APU?

AmdMSRTweaker isn't aware of the programmed SVI2 offset, which is -25mV on all Steamroller APUs. AMD has never produced a Steamroller APU with effective voltage (VID + SVI2 Offset) higher than 1.48750V (the production scale on A10-7890K is 1.40000 - 1.487500V for Pb0).

I'm saying exactly that. The voltage warning points on ASUS boards have no real world correlation with the actual silicon limits. The color indication based warning method is VID based (e.g yellow = VID * 1.1, orange = VID * 1.15, etc) as is their automatic voltage increments, when the voltage is left to auto. The fact is that most of the ODMs have no idea about the voltage limits of the silicon their boards are used with. Even when they do, they just don't care. Afterall all of the ODMs want to have the best overclocking board there is. IIRC ASUS boards will still increase the VDDNB automatically to 1.400V+ when you leave the voltage to "Auto" and set the memory frequency to 2400MHz (without any additional adjustments). That's already significantly higher than the rated breakdown is wink.gif
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