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-   -   Power Supply (Dual Vega 64) (https://www.overclock.net/forum/31-power-supplies/1719506-power-supply-dual-vega-64-a.html)

bustacap22 01-30-2019 09:11 AM

Power Supply (Dual Vega 64)
 
Hoping someone is able to provide what PSU wattage is recommended to run Dual Vega 64's.

i7 3930k OC to 4.5 ghz stock voltage 24/7

any input greatly appreciated.

Ha-Nocri 01-30-2019 09:13 AM

1000+W if you ever decide to over-clock.

Stock Vega 64 is rated at 300W

BroadPwns 01-30-2019 09:16 AM

~800W is what you need at minimum, it's also very wise to undervolt V64, even when overclocking.

Moparman 01-30-2019 09:30 AM

If you're overclocking the gpu's along with the cpu you will want a unit around 1000-1250w. I run a 1250w unit with my [email protected] and my SLI 980ti cards at 1450core and have no issues. Now I did have a 875w gold unit before this and if I was to OC the cards it with always OCP the psu.

doritos93 01-30-2019 09:36 AM

Find out for yourself.

https://outervision.com/power-supply-calculator

But you might wanna string two 1500w together. We all know how power hungry dem V64s are!

epic1337 01-30-2019 09:52 AM

what you need to watch out for is those transient spikes.


https://img.purch.com/powercolor-rx-...VtcHRpb24ucG5n


these spikes can far exceed the PCIe spec (2×8pins = 300Watts) which some PSUs really hate.
Seasonic's Focus plus in particular have weak transient response, in which they actually fail to supply power to particular cards.
https://www.techpowerup.com/249838/s...ibility-issues


Quote:

When it comes to AMD GPUs things are a bit more problematic.
Both of AMD's Vega 56 and Vega 64 series of graphics cards with serial numbers before January 2018, can experience system shutdowns when paired with a FOCUS PLUS power supply.
The issue is caused by higher than normal peak current being emitted by these graphics cards when under heavy load. This results in the power supply's internal protection safety being triggered.
Considering Seasonic's popularity the fact these power supplies are encountering problems is likely going to be a hit to their brand image.
At least they are stepping up to the plate having admitted to the problem while also investigating the root causes.
They are also encouraging anyone that is encountering issues to contact them for assistance.

Ha-Nocri 01-30-2019 10:09 AM

Damn, and I recently bought Focus Plus Gold 750W PSU. Had no idea about the issue

Penicilyn 01-30-2019 10:14 AM

I was using a Seasonic X-1250 to do it reliably. You're going to need a lot.

epic1337 01-30-2019 10:16 AM

well according to the threads in those forums, Seasonic has a solution by giving you cables with inline capacitors.
they also recommend using two different 8pin cables instead of using both pins of the 8+8pin cable it comes with.

BroadPwns 01-30-2019 10:18 AM

Quote:

Originally Posted by Penicilyn (Post 27831766)
I was using a Seasonic X-1250 to do it reliably. You're going to need a lot.

If you're talking about single GPU then it's att least twice an overkill. 800W is a bare minimum he'd need for dual V64 (which I'd actually discourage to do) if he intended to undervolt both of cards, 1000W is already giving a nice overhead for overclocking. But he'll end up almost capping the PSU anyway.


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