Overclocking a Sapphire r9 390 nitro

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ToxykVib3

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Feb 15, 2015
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So I'm really new to this overclocking scenario and I need help to get the most performance of my Graphics card and I know this is the right place to come to get help.
First I think that we should start with my PC specs (they may be important for this Idk).
Processor: i7 4790
GPU: sapphire r9 390 nitro (w/ backplate)
MOBO: ASUS B85M-GAMER
8Gb ripjaws x ram
and a seasonic S12II 620W.

Ok so as soon as I got my sapphire I bumped the GPU clock up to 1100Mhz and left the other settings as they were.
The current settings are:

GPU Clock: 1100Mhz
GPU voltage: +19 mV
Memory Clock: 1500Mhz

This is fine for me but not great by all means, I don't think that just increasing the gpu clock will give me the most get me the most performance out of it.
My goal is to get the most performance out of my GPU maintaining satble and with reasonebly low temps (as lower as possible considering the OC)
I've searched for some guides and I found this Toms guide for the sapphire http://www.tomshardware.com/reviews/sapphire-nitro-r9-390-8g-d5,4245.html#p10 and in the overclocking part of that review it states that the best settings that they've reached were and I quote: " Ultimately, with a GPU clock of 1090MHz and a memory clock of 1625MHz (6500 MT/s),".
I have absolutely no problem in trying out those settings bur I really want to know the opinion on some educated people about the matter and that would be you guys.
I want to know how to safely overclock my GPU and test it and how to get the best settings also.
 
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Either is fine. My findings:

Even if stable on valley, some games will crash when over 1100 no matter voltage

Memory overclock is pointless. I did loads of benches and saw no difference. This is a card with near on 400gb/s bandwidth. Leave mem around 1550 and push for core clocks

Power draw becomes ridiculous above 35mv+...measured at wall. For very little gain.

If you are stable at 1130mhz then well done...that's good for these gpus.
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scuzzycard

scuzzycard

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Feb 26, 2016
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I would download Unigine Heaven 4.0, and use that to test for instability, artifacting, and thermals. Other than that, just follow the guide - and remember your card could be slightly better or worse than the one tested in Tom's Guide. You'll have to go up in small steps and test thoroughly at each one. I would let Heaven run 4 times in a row at each speed. If you temperature start to go above 80, consider changing the fan curve to have the fans spin faster at temperatures above 70. Keeping temps down will also increase OC headroom. Ideally, you want the fans to spin as fast as possible without driving you crazy with noise. Also, I would leave the memory alone until I found a stable GPU core speed first.
 
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ToxykVib3

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Feb 15, 2015
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So far I've tested all settings one at a time and I've performed a test for each setting with unigine valley in ultra settings and passed through all the different scenes. Now I will teste the actual setting while playing
So far the settings are:

GPU clock: 1115Mhz
Voltage: +19mV
Memory Clock: 1600Mhz
 
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ToxykVib3

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Feb 15, 2015
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Ok this are the two best tests I've done so far:

The best test (settings):
Gpu clock 1136 Mhz
Voltage: +18/+19
Memory Clock: 1600Mhz

Unigine Valley Test: https://drive.google.com/file/d/0B1xc1ft-s78NbEJuWGhWMWJibWc/view?usp=sharing

Second best (Settings):

Gpu Clock: 1115Mhz
Memory Clock: 1500Mhz
Voltage: +19
Unigine Valley test: https://drive.google.com/file/d/0B1xc1ft-s78Ndnc1SElDbnBlQ1k/view?usp=sharing

My question is: is the first overclock worth when compared to the second? Am I reducing that much the lifespan of my GPU by overclocking that mich like in the first test?


 
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burgessanthony

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Jun 27, 2012
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Either is fine. My findings:

Even if stable on valley, some games will crash when over 1100 no matter voltage

Memory overclock is pointless. I did loads of benches and saw no difference. This is a card with near on 400gb/s bandwidth. Leave mem around 1550 and push for core clocks

Power draw becomes ridiculous above 35mv+...measured at wall. For very little gain.

If you are stable at 1130mhz then well done...that's good for these gpus.
 
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Solution
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Rexer

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Apr 1, 2013
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I got similar clocks and higher clocks but I notice Crimson updates and the condition of the games sometimes changes the way clocks & temps rise and fall. Was stable @1130mhz, 30mV, fans @65/70%. Temps were down 62c to 74c. Then I installed a Crimson update and started seeing high temps and screen crashing so back down the clock under 1100mhz and repaired or reinstalled the games. So I'm averaging 1090 and 1110mhz, 25mV right now (being on the safe side).
 
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burgessanthony

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Jun 27, 2012
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Yeah, I'm at 1100core 1600 mem, with 13mv core and aux. You usually must have a bump on aux if pushing vram speeds.

Drivers can affect clock stability.

Let's be honest, difference between stock 1000 and 1100 is 10%, which is decent. 1100 to 1130 is minimal.

1100 seems to be a nice sweet spot
 
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Rexer

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Yeah, I think you're right. 1100/1600 is a good place to cruise.

 
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