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Overclocking AMD A10-7870K and the impact on VRM

post #1 of 4
Thread Starter 
So I have never overclocked anything before and my knowledge is limit in this field. What I want to know is if I kept the volts at stock and increased the overall CPU speed would this cause the VRMs to do more work, or since I'm not changing the volts I'm giving the CPU mean that the VRMs would basically stay the same: temp wise and whatever else.

I know that I won't get much more out of the CPU without bumping up the volts but I really don't need the extra performance and I just want to do some experimenting.
post #2 of 4

Something about overclocking that has to be taken into account for those running Windows 10 systems from last year's free upgrade is that crashing a PC almost always results in damaged files - not just those involved in the app that crashed but all the other services going on in the background.

 

This means that before you start you need a reliable strategy for restoring the operating system when a crash occurs, which is where freegrade W10 systems start creating difficulties.

 

It is one thing to create a Windows Image Backup folder but quite another to successfully restore a system from it. The fact of the matter is that when you Restart with Shift from the Right Button Start menu to get into Repair Mode you lose control completely over whether your OS is ever going to run again.

 

So I would say that the first thing you need for overclocking in W10 is a DVD/USB Installation disk/stick so you can guarantee your ability to restart it.

 

As for the A10-7870K, it is already running in default mode just below its maximum safe voltage, so overclocking the CPU part is a case of increasing the APU Frequency while you adjust the medium settings of VRM Power Control(eg. Cpu Load Line Calibration, Cpu Current Capability, Cpu Power Phase Control, Nb Load Line Calibration, Nb Current Capability, Cpu Power Thermal Control, Cpu Voltage Frequency, Cpu Power Duty Control).

 

You should also bear in mind that changing Apu Frequency also changes the operating frequencies of Gpu, Memory and northbridge as well as the CPU according to the following formulae:
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)
I posted a gadget that does these calculations for you. If you want to download it it's in a zip file here. If you have any difficulties unzipping it I packed it with Total Commander.
 

post #3 of 4
If you don't already own a 7870k, you should know that prices on the 7890k have fallen to the same level. There isn't much reason to buy a 7870k just now for that reason.
post #4 of 4
Quote:
Originally Posted by jovaee View Post

So I have never overclocked anything before and my knowledge is limit in this field. What I want to know is if I kept the volts at stock and increased the overall CPU speed would this cause the VRMs to do more work, or since I'm not changing the volts I'm giving the CPU mean that the VRMs would basically stay the same: temp wise and whatever else.

I know that I won't get much more out of the CPU without bumping up the volts but I really don't need the extra performance and I just want to do some experimenting.
This part is wrong. @Himo5 has shared more experience than anybody here on this subject, imo. For frame of reference: Post #41.
As you can see, with a single upticked voltage step, 7870K can be overclocked up to 4.6GHz. No wonder you will run into temperature issues.
The Machine
(14 items)
 
Nexus 7 2013
(11 items)
 
 
CPUMotherboardGraphicsRAM
A10 6800K Asus F2A85-V MSI 6870 Hawx, VTX3D 5770, AMD HD6950(RIP), Sap... G.skill Ripjaws PC12800 6-8-6-24 
Hard DriveOptical DriveOSMonitor
Seagate 7200.5 1TB NEC 3540 Dvd-Rom Windows 7 x32 Ultimate Samsung P2350 23" 1080p 
PowerCaseMouseAudio
Seasonic s12-600w CoolerMaster Centurion 5 Logitech G600 Auzen X-Fi Raider 
CPUMotherboardGraphicsRAM
Quad Krait 300 at 1.5Ghz Qualcomm APQ8064-1AA SOC Adreno 320 at 400mhz 2GB DDR3L-1600 
Hard DriveOSMonitorKeyboard
32GB Internal NAND Android 5.0 7" 1920X1200 103% sRGB & 572 cd/m2 LTPS IPS Microsoft Wedge Mobile Keyboard 
PowerAudio
3950mAh/15.01mAh Battery Stereo Speakers 
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The Machine
(14 items)
 
Nexus 7 2013
(11 items)
 
 
CPUMotherboardGraphicsRAM
A10 6800K Asus F2A85-V MSI 6870 Hawx, VTX3D 5770, AMD HD6950(RIP), Sap... G.skill Ripjaws PC12800 6-8-6-24 
Hard DriveOptical DriveOSMonitor
Seagate 7200.5 1TB NEC 3540 Dvd-Rom Windows 7 x32 Ultimate Samsung P2350 23" 1080p 
PowerCaseMouseAudio
Seasonic s12-600w CoolerMaster Centurion 5 Logitech G600 Auzen X-Fi Raider 
CPUMotherboardGraphicsRAM
Quad Krait 300 at 1.5Ghz Qualcomm APQ8064-1AA SOC Adreno 320 at 400mhz 2GB DDR3L-1600 
Hard DriveOSMonitorKeyboard
32GB Internal NAND Android 5.0 7" 1920X1200 103% sRGB & 572 cd/m2 LTPS IPS Microsoft Wedge Mobile Keyboard 
PowerAudio
3950mAh/15.01mAh Battery Stereo Speakers 
  hide details  
Reply
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