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Overclocking a 7850 OC Edition (Results and Opinions)

post #1 of 5
Thread Starter 
Hi,

First of all my system info (Sapphire 7850 PC Edition)



I increased the power control settings +20% from AMD control center (i am not sure why)
But i understand it control the power consumption or something like that.

I am on 1GHz core clock now and stock memory OC 1250.

IDLE temp 33°C | Max Fan Speed 20% AUTO
Max LOAD temp 70°C | Max Fan Speed 47% AUTO
VDDC 1.075 V (i am not sure this is good or not)



Tested by EVGA OC Scanner X



Go more?
post #2 of 5
Quote:
Originally Posted by RebelGuy View Post

Hi,

I increased the power control settings +20% from AMD control center (i am not sure why)

The reason is that the card dynamically controls its power draw. When you OC, the power draw raises, but the card supresses its speed in order to drop the power down to default level. Raising the limit allows the OC to work despite the power regulation feature, because it doesn't triger it - the limit is 20% higher - so the card can run as expected after the OC smile.gif
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Core i5 4460 AsRock H81M-DG4 Sapphire Rx470 Platinum KVR 1600 16Gb 
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Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
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My PC
(14 items)
 
Wife's PC
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 4460 AsRock H81M-DG4 Sapphire Rx470 Platinum KVR 1600 16Gb 
Hard DriveHard DriveCoolingOS
2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
MonitorKeyboardPowerCase
Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
MouseAudio
Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
OSMonitorKeyboardPower
Windows 7 Pro x64 Toshiba 32" FullHD TV Logitech FSP Hexa 550 
CaseMouse
DeLUX Logitech 
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post #3 of 5
Thread Starter 
Thank you for your reply, do you recommend go higher for both GPU and and Memory clock with the same voltage ?
post #4 of 5
Welcome to OCN RebelGuy...
Quote:
Originally Posted by RebelGuy View Post

Hi,

First of all my system info (Sapphire 7850 PC Edition)



I increased the power control settings +20% from AMD control center (i am not sure why)
But i understand it control the power consumption or something like that.

+20 is only there to prevent the core clock from throttling during high loads, it widens power consumption barrier the card tolerates; as a result the core clock will remain more constant during high power consumptions .
At +20 the core is less likely to throttle than +10 or +0 for example.
Quote:
Originally Posted by RebelGuy View Post



Go more?

It depends on your needs and heat/ noise. You still have voltage/ temperature headroom.
By Sapphire up to 1250mV is safe, but for 24/7 I won't go over 1225mV or over 80 C.
But at these voltages compared to your stock 1075mV you will see a significant increase in power consumption, noise & heat.
Also best ways to test for stability is trying to play demanding games such as Crysis 3, Metro LL... etc.
Programs such as EVGA OC Scanner, OCCT & Furmark are pretty much useless for determining real world stability.
Edited by HeadlessKnight - 7/29/13 at 1:37pm
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Samsung 850 Pro 1 TB Samsung 950 Pro NVMe 512 GB Noctua NH-D15 Windows 10 
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Asus VG236H 23" 120 ZM1000-HP CoolerMaster HAF 922 
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post #5 of 5
Additional cooling might let you go further. Maximum recommended\safe voltage 1225mV. So, try higher clocks if you want to get best possible performance thumb.gif
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