How to maximize Vega 64 LC performance?

[koralski]

Really late to the party here... got a Vega 64 LC in good condition for about 23 USD.

I have a 550W PSU and my main load on the card is gonna be gaming, what can I do to maximize performance? My experimentation hasn't been able to hit the sweet spot of performance and power consumption. The card is extremely cool, even under load.

Also, which tool is recommended? Is there a way to apply the overdriven/adrenaline profile at every boot?

Thanks in advance guys!

 

[agent_x007]

How much of performance loss you are willing to take to get overall power usage down ?

 

[Contra]

550W PSU

Change to 1000W))
My old 64 LC used 400W plain, and 600W spike in furmark (max tdp)). Yes, it's work on 330W on auto/turbo and 263W on default power mode, but spike is too high.
Don't OC core. Use UV core and oc mem.
Adrenalin is good.

 

[Dr. Dro]

Mmm, the 64 LC is way too power hungry to run well on a 550 W supply. My advice would be to undervolt and reduce the power limit as low as possible, out of stability concerns really. No room to bargain for performance if you have to run it on a 550 W.

23 bucks on that card is an absolute steal, by the way. Amazing GPU for that price.

 

[irisChronomia]

Mmm, the 64 LC is way too power hungry to run well on a 550 W supply. My advice would be to undervolt and reduce the power limit as low as possible, out of stability concerns really. No room to bargain for performance if you have to run it on a 550 W.

23 bucks on that card is an absolute steal, by the way. Amazing GPU for that price.

Yeah, and maybe lock the frequency/voltage limit in MSI Afterburner - Ctrl+F to bring up the voltage/freq graph, and wall off the > 950mV parts. If you make all voltages beyond e.g., 950mV to have a lower frequency on the voltage/freq graph, it'll effectively disable those higher voltage ranges.

Off the topic - I remembered GCN3/4 (Fiji, Polaris) to see less wattage drops when undervolting than their modern counterparts (RDNA / Pascals). Wonder if this is also true for Vega, though.
My RX570 drew 75W on 550MHz / 900mV. i might've done something really wrong.

 

[koralski]

How much of performance loss you are willing to take to get overall power usage down ?

I am not a power saving freak. I just want the most I can get from the card with my PSU.

Change to 1000W))
My old 64 LC used 400W plain, and 600W spike in furmark (max tdp)). Yes, it's work on 330W on auto/turbo and 263W on default power mode, but spike is too high.
Don't OC core. Use UV core and oc mem.
Adrenalin is good.

1000W is 145 USD , I managed to get around 1170 Mhz @ 950mV on memory before artifacts started to show up. Any other tweaks? How low can I undervolt core?

Mmm, the 64 LC is way too power hungry to run well on a 550 W supply. My advice would be to undervolt and reduce the power limit as low as possible, out of stability concerns really. No room to bargain for performance if you have to run it on a 550 W.

23 bucks on that card is an absolute steal, by the way. Amazing GPU for that price.

The card hasn't crashed a single time and I've run it with +50 power limit for several days, but I recognize the real issue at hand.

Is that a good starting profile?

EDIT : It's not. I crashed instantly when I ran Furmark.

 

[Dr. Dro]

I am not a power saving freak. I just want the most I can get from the card with my PSU.

1000W is 145 USD , I managed to get around 1170 Mhz @ 950mV on memory before artifacts started to show up. Any other tweaks? How low can I undervolt core?

The card hasn't crashed a single time and I've run it with +50 power limit for several days, but I recognize the real issue at hand.


View attachment 400271

Is that a good starting profile?

EDIT : It's not. I crashed instantly when I ran Furmark.

Yuuup. Card will draw maximum power under FurMark, considering the power limit is on default value of 100%, the Vega 64 LC is gonna pull around ~375 W and a relatively high amount of current, most 550 W PSUs won't cope with that (especially budget models), especially after transients are accounted for. Considered 100% means 375-400 W range, I'd really put it at the lowest setting until you can get a more powerful PSU.

You should be able to get your highest voltage point to around 1000, perhaps 950 mV if you have some luck. Adjust the other ones accordingly, dropping like 25 mV or so. You should be able to get your HBM at 1200, too. My old Frontier used to run 1200 just fine, but if you can't, then try 1125 to 1150 range. At least 1100 it's gonna do stable.

 

[koralski]

Yuuup. Card will draw maximum power under FurMark, considering the power limit is on default value of 100%, the Vega 64 LC is gonna pull around ~375 W and a relatively high amount of current, most 550 W PSUs won't cope with that (especially budget models), especially after transients are accounted for. Considered 100% means 375-400 W range, I'd really put it at the lowest setting until you can get a more powerful PSU.

You should be able to get your highest voltage point to around 1000, perhaps 950 mV if you have some luck. Adjust the other ones accordingly, dropping like 25 mV or so. You should be able to get your HBM at 1200, too. My old Frontier used to run 1200 just fine, but if you can't, then try 1125 to 1150 range. At least 1100 it's gonna do stable.

The problem isn't the maximum power, I've ran 40 FurMark runs. I think I overdid the undervolt.

 

[Degreco]

Mmm, the 64 LC is way too power hungry to run well on a 550 W supply

I second that. As a former Sapphire Vega64 owner my PSU at that time was a 550w unit too It struggled with the card and the other system requirements until I switched to 750w. The Vega64 has insane peaks, just like the 6090XT they can reach well over 500w. They are rare but they will occur if one games long enough (I mean hours of gaming).

If you persist on that 550w PSU a good UV will help with stability and minor overclocking as well.

Check this thread to find the sweet spot:

https://www.reddit.com/r/Amd/comments/b08jc7/vega_undervolting_guide_for_2019_with_extensive

 

[io-waiter]

My old Sapphire Vega56 needed to be limited in order to get it stable on a 550w seasonic, those peaks are nasty.

 

[Dr. Dro]

Yeah, and maybe lock the frequency/voltage limit in MSI Afterburner - Ctrl+F to bring up the voltage/freq graph, and wall off the > 950mV parts. If you make all voltages beyond e.g., 950mV to have a lower frequency on the voltage/freq graph, it'll effectively disable those higher voltage ranges.

Off the topic - I remembered GCN3/4 (Fiji, Polaris) to see less wattage drops when undervolting than their modern counterparts (RDNA / Pascals). Wonder if this is also true for Vega, though.
My RX570 drew 75W on 550MHz / 900mV. i might've done something really wrong.

I had the Fury X and both generations of Vega back then, and I recall all of them behaving quite similarly. The reason you see less drops on older designs is probably because of the process node I suppose. Fiji was a glorious chonk of 28 nm