Using the individual hardware pages for each of the cards, let's calculate the total power our cards can request from the system.
For example, let's say we're building a rig with 6 Nvidia RTX 3080 cards. Here's the specs section for it, the GPU Power is stated at 320W:
So the total cards power we should be considering is 6 * 320W = 1920 W.
At this stage you need to decide if you're planning to mine with your CPU or not. Since CPUs are regularly not loaded much during GPU mining, it can be considered a small income, in which case you need to account for the CPU's power draw too (add ~50W per core for safety).
For the motherboard, drives, fans, etc. the typical recommendation is adding 150W more.
Risers themselves typically don't take much power, around 15-40W per riser itself, for the safer side let's count them as 75W.
PCI-E 6-pin maximum power is 75W what the risers requring.
Molex: around 68W, can be more or less. Depends on the PSU.
The required power of our example rig grows by 150W here since we don't plan to mine on our CPU.
Here's where we add the safety margin on top of the power consumption we can expect during power up and if running stock. The rule is simple: multiply the calculated consumption by 1.25
With our example rig: 2520 * 1.25 = 3150W, so we should be looking at total of 3200W or more available from our Power Supplies.
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