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Old 09-06-17, 08:08 AM
JoJo-JCLDJB JoJo-JCLDJB is offline
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Sapphire RX580 8Gb Nitro+ // Overclocking & Power Limit?

Greetings overclockers!

Specs:

Hyper 212 Evo
AMD A8-7650k 3.3Ghz->3.8Ghz
RAM DDR3 1600Mhz -> OC to 2133 CL13
CX600 PSU
MSI A68HM-E33 V2 Motherboard with added heatsinks on MOSFETs & directed fan.


**I have the Sapphire RX580 8Gb Nitro+ card (love it!)

Boosts to 1411Mhz - using Sapphire Trixx program, when I hit the automatic Boost button, this bumps up to 1425mhz with no voltage changes.

I tried, what I thought to be a conservative overclock, by increasing the (Power Limit) to 20% and changing the frequency to 1450Mhz.

I did not touch the actual voltage/mvolts or the memory frequency...yet...

This resulted in a nice Unigine Superposition benchmark but I KNOW can do better.

My question is:
A friend of mine thought I was crazy to go with a 20% power limit increase.
(but I only hit 55C for my Superposition benchmark....with fans full blast...so).

Is this true? Is a Power Limit of 20% too much or really conservative?

Because I've read online that some increased the Power Limit to 50% for the RX480 and some even higher.

And maybe it's because my friend has an Nvidia card so the Power Limits for them work differently?

Really want to push my GPU to 1,500Mhz if I can... I know some of you already said I would struggle but, I want to try...but I don't want to fry it by this 'Power Limit' thing.

Any ideas? What Power Limits do you guys have on your RX cards?

Thanks in advance for your help.

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  #2  
Old 09-06-17, 09:34 AM
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Lynx Lynx is offline
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You can max out the power limit no problem dude, as long as thermals aren't becoming an issue. First thing I do with my gpus is to max the power limit to prevent hitting power limits and reducing the frequency.
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Old 09-06-17, 10:29 AM
JoJo-JCLDJB JoJo-JCLDJB is offline
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Quote:
Originally Posted by Lynx View Post
You can max out the power limit no problem dude, as long as thermals aren't becoming an issue. First thing I do with my gpus is to max the power limit to prevent hitting power limits and reducing the frequency.
Firstly, thanks for reply.

A few more questions about this power limit - I know CPU OC'ing but GPU is fairly new to me...

When leaving Power Limit at normal, and comparing it to 100%/max power limit.

Does this basically mean, that it will jump to 100% of the power limit for the normal boost (telling the GPU to use 100% of it's already imposed power limit?

Or does it mean 100% Power Limit = over & beyond the normal power limits already encoded?.

It's a little confusing for me; at least, it isn't 100% clear on what it actually means...

Does it mean something else, completely different?

Thanks again for your reply, much appreicated
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  #4  
Old 09-06-17, 01:02 PM
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Chrazey Chrazey is online now
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I gotta say, even I'm totally lost on this all power limits etc when it comes to GPUs
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  #5  
Old 09-06-17, 01:31 PM
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Lynx Lynx is offline
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The power limit will basically keep your wattage below a certain number. Useful if you have thermal or power supply constraints.

The only reason not to max the power limit for me is: too much heat or the increase of coil whine when the card is overclocked.
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