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Vega 64 struggling to hit peak clocks

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post #1 of 43 (permalink) Old 10-22-2018, 03:19 AM - Thread Starter
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Vega 64 struggling to hit peak clocks

I have a reference cooled Sapphire Vega 64 card. GPU-Z says that the stock GPU clock is 1630mhz:



However, regardless of what mode I run it in, the card does not manage to hit those clocks and actually fluctuates quite wildly. Benchmarks from Heaven and data recorded in GPU-Z logging:

This is stock everything and set to "turbo mode" in AMD Settings:



This is in "custom mode" with no fan limit and 50% power limit increase:



It seems that with the increased power limit, the card can sustain higher clocks, but again, it's still not hitting the 1630mhz as reported.

Does anyone know why this may be? My old Fury would hit it's overclocked figure and just be pinned to that clock speed so long as it was in 3D mode. This Vega 64 seems to have dynamic clocks!

I tried increasing the voltage for the highest GPU state (which is the 1630mhz clock), but it won't go above the stock 1200mV (keeps resetting itself when I type in a higher value).

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post #2 of 43 (permalink) Old 10-22-2018, 03:40 AM
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Temperature limit.

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post #3 of 43 (permalink) Old 10-22-2018, 03:52 AM - Thread Starter
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Quote: Originally Posted by BroadPwns View Post
Temperature limit.
You may be right actually. Will the card begin to throttle at "max" or "target" temp? I have it set as 85c max, 70c target.

This is what I am seeing during a run:



Looks like the core is hitting the 70c target. I had assumed that throttling would take place at 85c though.

What kind of values are safe to run for max and target temps then?

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post #4 of 43 (permalink) Old 10-22-2018, 04:13 AM
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I'm pretty sure they don't throttle below 65C by looking at V64 Liquid Edition. I just hope you didn't buy it recently.

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Last edited by BroadPwns; 10-22-2018 at 04:19 AM.
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post #5 of 43 (permalink) Old 10-22-2018, 04:41 AM - Thread Starter
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Quote: Originally Posted by BroadPwns View Post
I'm pretty sure they don't throttle below 65C by looking at V64 Liquid Edition. I just hope you didn't buy it recently.
I bought it 2nd hand recently. I assume it was an ex mining card, but price was fine.

To be fair, it performs fine in games and elsewhere. Just caught my eye that it didn't sustain peak clocks.

Why do you say you hope I didn't buy it recently?

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post #6 of 43 (permalink) Old 10-22-2018, 05:01 AM
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There are quite a few lower or same priced and significantly faster cards out there, sadly - only from Nvidia.

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Last edited by BroadPwns; 10-22-2018 at 05:25 AM.
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post #7 of 43 (permalink) Old 10-22-2018, 05:07 AM
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undervolt it.
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post #8 of 43 (permalink) Old 10-22-2018, 05:08 AM - Thread Starter
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Quote: Originally Posted by BroadPwns View Post
There are quite a few lower or same priced and significantly cards out there, sadly - only from Nvidia.
I had a look around and this card was priced £40-£50 below what the average gtx1080 was going for.

Also, in games I play (mainly Battlefield), the Vega 64 was ahead in most benchmarks at 1440p.

I'm not disappointed by performance at all and at point of purchase, it seemed to offer significantly better performance for price compared to a used GtX1080.

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post #9 of 43 (permalink) Old 10-22-2018, 05:13 AM - Thread Starter
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Quote: Originally Posted by kd5151 View Post
undervolt it.
I'll give it a go. I'll need to do some testing to ensure that undervolting doesn't then it turn affect clock speeds if it can't draw the right power.

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post #10 of 43 (permalink) Old 10-22-2018, 07:09 AM
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Quote: Originally Posted by 98uk View Post
Quote: Originally Posted by kd5151 View Post
undervolt it.
I'll give it a go. I'll need to do some testing to ensure that undervolting doesn't then it turn affect clock speeds if it can't draw the right power.
Undervolting is indeed recommended. My ref Sapphire 64 is flashed with LC BIOS and runs great on 1750MHz with 1V on Core and 1050MHz with 950mV on HBM with 50% power limit. Temps with my custom loop make it rarely go over 40°C.

Not every game makes it go to max clockspeed, only the more demanding games do.

Could be the Hot Spot temps that makes the card throttle down.

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