Quote from: Rasanders22 on January 09, 2018, 06:13:14 PM

Quote from: Undefined31415 on January 09, 2018, 05:24:21 PM

Quote from: Oper92 on January 09, 2018, 05:18:22 PM

Quote from: Undefined31415 on January 09, 2018, 04:21:39 PM

You definitely want to overbudget when you're looking at PSU ratings, especially for 24/7 mining. Running a PSU 24/7 close to its maximum is asking for trouble.

In general, you don't want to exceed about 70-80% of the PSU's rated capabilities. Buying a PSU capable of delivering more power does not cause you to use more power, but do note that most PSUs reach optimal efficiency if they're loaded somewhere around 50% of the rating. (For a better 80+ PSUs, this becomes less noticeable.)

Add up the TDP of the CPU and all of your graphics cards, under the assumption that you don't have an unusually high number of drives or fans. Then multiply the sum by 1.25-1.4 (subjective), and you have a rough estimate of what you're looking for (generally round up to the nearest typical PSU rating, but you could round down if the difference is small enough). You can usually get by with less, especially if you mess with clock & power settings, but that's for you to play around with.

Also check for the number of connectors, particularly PCIe 6-pin or 8-pin connectors. These are necessary for powerful cards in a multi-GPU system.

Look for PSUs with the guts manufactured by Seasonic, SuperFlower, FSP, Delta, or another reputable manufacturer. Most upper-end units from brands such as EVGA are made by one of these.

Those made by HEC, CWT, Sirfa/Sirtec are lower on the totem pole, but *usually* do okay. CWT especially has gotten better since they partnered with Corsair a few years back. However, for heavy 24/7 loads, I usually look for the OEMs in the above tier.

Those made by unknown OEMs should generally be avoided. Perhaps they'll be okay, or they'll fail. Worst case involves a crappy PSU damaging your other components.

Thanks man ! This seems pretty clear.
So, Assuming i've this configuration:

Mobo: H81 Pro BTC v2.0
CPU: Intel G1840
RAM: 1x4gb
GPU: 1x Sapphire Radeon RX 580 8GB GDDR5 PULSE

Intel G1840 has a TDP of 53W.
Sapphire Radeon RX 580 8GB GDDR5 PULSE has a TDP of 185.

I sum up: 238, then multiply per 1.4 = 333.2

1) If i decide to buy a 500W PSU than 70% (500*70/100) this will result in 350W so 20W of margin from estimations
2) If i decide to buy a 450W PSU than 70% (450*70/100) this will result in 315W so -16.2W from estimations.

While 2) should be good too, 1) for sure good. So the PSU should be greater than 500W.
According to amazon the best option is Corsair 550W at 44 shipped

This comes with the cable needed for Radeon RX 580 8GB GDDR5 PULSE that is 1x8pin and my psu has 2 of it, So OK
This is it.. right? Thanks again for your patience Cheesy

If you're certain that you're going to expand, then it may be worth considering higher-end PSUs, at least beyond 500W. For example, it's usually the case that up until around 850W, bigger PSUs give you more watts per dollar. (Over 850-1000W ish, the prices start increasing more rapidly than capacity, which makes 2x PSUs worth considering)

Make sure to ground the PSU cases to eachother..

How this should be done?