I have a 1200w gold PSU and want others opinions on whether or not it can power 5 480s and a r9 290. The 290 will be undervolted a fair bit...but I'd still like to dual-mine. I feel like it'll be cutting it close. I ordered the PSU with just 5 480s in mind, but have a 290 that could be doing more than collecting dust.
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let's do the Math:
5x 480s = 5x 130W (if you undervolt them right!) = 650W
1x 290 = 300W (well... at normal config...) = 300W
Other Parts = 200W (+/-) = 200W
so... you would need about 1150W to run them all...
Could you do it? YES!!!
Should you? ... NO!...
I Think you should give at least a 20% margin for the Cards to Peak (spike)
But if you trust your PSU (don't do that!) you could technically get away with it...
By the way... i'm running a stress test on a 1050W PSU whit 7 RX 480s... lol just to see what will blow first! ^^ (i'm serious) the total power draw from the system is ~1040W...
But buy a kill a Watt and measure it, to be safe.
like too much power for one molex?
or
like GPUs + Molex are to much for the PSU to handle?...
or
like 4 Molex in one cable?...
one molex can handle 132W... (the RX 480s !WAS! known to draw more than 75W from the PCI-e slot, but it was reduced with bios fix 16.7.1) so no close to a problem there....
if you take the 6 GPU, and assuming they are taking 70W from the Molex (overstatement, but lets say), then you have no problem at all since you are SUBTRACTING those 420W (70x6) from the Cards @ the PSU, with the rest going trough the 6PIN and/or 8PIN....
source on Molex Max Ws see here:
https://en.wikipedia.org/wiki/Molex_connector#Disk_drive_connector_.28Molex_8981_Series_Power_Connector.29
and use this to convert Volts+Amperes to Watts:
http://www.rapidtables.com/calc/electric/watt-volt-amp-calculator.htm
The Molex connector itself is ok for 100+ W, but the commonly used 18AWG 12V wire can only handle about 100W, so you can use only one molex connector per line.
There are clever workarounds for that in other topics on how to have parallel 12V lines for your molexes, so you can use all of them.
So once I get that last 480 we'll see! But like I said before, I will just switch some PSU's around from another rig if I need to.
Converting the GPU core Watts in to [email protected] (using historical data and statistics...)
you can contribute to the discussion here:
https://forum.ethereum.org/discussion/comment/59791#Comment_59791