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The correct way of powering the risers for the 470/480
Unfortunately the PCIe Slot power is at least 5Amps or so for the 470/480. Some of the 6 pin 480 even use much more than 5 Amps. You can't power too many of them with the daisy chain Molex and especially the SATA connectors. Even the 8 pin 470s draw around 5 Amps from the slot.
If you have the space, best would be to install NO MORE THAN 1 of your 470/480 directly onto the motherboard.
I would avoid using any SATA connectors to power any of the 470/480 GPUs. They draw at least 60 watts and those SATA connectors are generally used for hard drives which draw about 5 watts on average.
I wouldn't use any more than 1 of the Molex connectors to power any 470/480. Usually a PSU has 2 sets of these (6 molex in total) so you can power 2 GPUS from each seperate chain.
The best method would be as follows. Usually most PSUs have 2x 6+2pin on each chain such as follows.
You would plug in one of those to your 470/480 #1 connection and the other would always be unused. Since the length wouldn't reach the next card. So you would buy a PCIe extension cable such as below
Plug in the unused PCIe #2 connector to this extension and splice the other end +12V and GND directly onto your Risers power.
This way you could run any number of high power 480s and overclock them to the max and you would never have any melt since the PCIe has plenty of power and is a higher gauge.
If you have the space, best would be to install NO MORE THAN 1 of your 470/480 directly onto the motherboard.
I would avoid using any SATA connectors to power any of the 470/480 GPUs. They draw at least 60 watts and those SATA connectors are generally used for hard drives which draw about 5 watts on average.
I wouldn't use any more than 1 of the Molex connectors to power any 470/480. Usually a PSU has 2 sets of these (6 molex in total) so you can power 2 GPUS from each seperate chain.
The best method would be as follows. Usually most PSUs have 2x 6+2pin on each chain such as follows.
You would plug in one of those to your 470/480 #1 connection and the other would always be unused. Since the length wouldn't reach the next card. So you would buy a PCIe extension cable such as below
Plug in the unused PCIe #2 connector to this extension and splice the other end +12V and GND directly onto your Risers power.
This way you could run any number of high power 480s and overclock them to the max and you would never have any melt since the PCIe has plenty of power and is a higher gauge.
Comments
Connecting it via the Sata to molex still goes back to the same 12v rail.
However someone else made a post about the flimsy sata connector compared to the molex.
You should NEVER use the SATA connectors in my opinion. Use the MOLEX instead or plug it in directly into the motherboard.
Or if you have any of those KNC Jupiter miners, take it from them.
You can also easily build on yourself.
http://www.evga.com/products/Specs/PSU.aspx?pn=cca25c36-4310-421d-bff9-be6a5b7ac541
So how do you suggest that I should plug all 6 usb risers? I'm using these:
https://www.aliexpress.com/item/Best-quality-PCI-E-PCI-E-Express-1X-to-16X-Riser-Card-USB-3-0-Extender/32623069793.html?spm=2114.13010608.0.56.fWLKjs
I tried to look up for that 6-pin female to 4-pin molex adapter that you've posted the picture in the first post, but I can't seem to find them anywhere.
You can't buy that adapter that I drew above with paint, you need to custom make it youreself.
Building that custom adapter is not an option.
What about if I use standard unpowred ribbon risers?
You can use unpowered but you can't use more than 1 per motherboard. Since the power will come from the motherboards +12V connection.
More advanced version is to split one 6pin to 3 molex 12v line.
So you can take the 12v from one 6pin connector to feed 3 molexs and not only one.
How sure are you that 1 sata cable like this pic
can't safely power multiple risers for 480s if the 480s are undervolted?
So, what is the power distribution (in watts) for Sapphire 470 Nitro+, OC reference 470 (platinum) or MSI 470 gamingX 4gb?
I'm using 2 rx 480 red devil + 2 rx 480 ref + 2 rx 470 msi
Even powering a single Polaris GPU off SATA is exceeding what the SATA connector was designed to handle.
1 GPU per SATA strand with an undervolt will hopefully be safe, (I have some 470 setup this way) but this does mean that many PSUs can't handle more than 4 GPUs.
I've been doing mixed rigs for my +5 GPU rigs. say.... a pair of 280 or 380 with risers on a single SATA strand and then Polaris cards each with their own Molex or SATA strand for risers.
@adaseb where are you sourcing the +5v from for these bootleg adapters?
Tomshardware even got similar results from the Mainboard +12V connector.
http://www.tomshardware.com/reviews/amd-radeon-rx-470,4703-6.html
You can power these risers anyway you like, however this is just a safety pre-caution.
Really crappy design by amd, this cannot be good for a logic board with a gaming setup of 2 480's in crossfire..
I just set up a rig w/ 4x RX470 Nitro's, each card on its own SATA power cable > Molex. (I have run out of molex-only power cables but will order more)
Flashed to a custom ROM and started monitoring the temps with IR thermometer as I mine. The power plug area (where Molex plugs into the risers) went from:
28.5C (idle) to 37.5C (Eth only)
28.5C (idle) to 40C (dual mining)