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How on earth do you link up these cards all up together?

Soldato
Joined
17 Dec 2004
Posts
8,749
2 mining rigs. Each rig consists of 13 radeon RX 5700 xt 8GB ETH 700 MH/s GPU cards.
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Mining is heavy compute but very low data throughput.

Here's an image of the board mentioned above, those little PCIE slots are all x4, so you can have 4x more of them than on normal boards. Such usually isn't recommended for a GPU, but is completely fine for mining as the algorithms primarily just leverage the compute, they don't transfer much data to and from the GRAM.

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You either get a board with a ton of 1x slots or you get pcie splitters, then for each card you get an extension cable.
The power requirements are pretty meaty, so you tend to need a specialist PSU.

How profitable is this?

Go here - https://whattomine.com/
Plug in what hardware you have and your electricity cost, and it will tell you which coins you can mine and what the daily profit off that will be. For one of these rigs (assuming 14x 5700xt at approx UK consumer power prices) you're looking at something like £50 per day mining ethereum at the moment.

That means at the moment the rig would pay for itself in around half a year, if you can get a 5700xt for approx £500, and if the prices of cryptocurrency stay where they are.

(edit - the going auction rate for a 5700xt seems to be closer to £800, so it would likely be at least 240 days, or around 8 months, before it pays itself off. *if* crypto doesn't nosedive before then)
 
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Theres 14 cards there 7 in each rig

It does look a little fake or not properly setup. The back top lot the front one doesnt seem to be plugged into anything bar the power.

There are 21 cards though not 14. Its hard to see how they are connected to a computer.
 
There are 21 cards though not 14. Its hard to see how they are connected to a computer.

I think there are 14 in each of the two rigs there, double-decked.

For connection, look up "PCIe extender 1x" on a popular site, effectively there are tiny 1x PCBs that can be connected via something like a USB cable to 1x connectors on a motherboard like the one above.

I'd think it was ingenious if I didn't also think cryptocurrency was a dumbass waste of time and resources, and a massive backwards step for global energy wastage...
 
I think there are 14 in each of the two rigs there, double-decked.
For connection, look up "PCIe extender 1x" on a popular site, effectively there are tiny 1x PCBs that can be connected via something like a USB cable to 1x connectors on a motherboard like the one above.
I'd think it was ingenious if I didn't also think cryptocurrency was a dumbass waste of time and resources, and a massive backwards step for global energy wastage...

Yeah I understand that just that the actual computer (motherboard) must be buried in there somewhere and the one you mentioned joins 4 GPU's to 1 PCIE slot so it must be motherboards with multiple PCIE slots not the extender you mention because all the cards are not straight. Anyway my curiosity ends here.
 
Mining is heavy compute but very low data throughput.

Here's an image of the board mentioned above, those little PCIE slots are all x4, so you can have 4x more of them than on normal boards. Such usually isn't recommended for a GPU, but is completely fine for mining as the algorithms primarily just leverage the compute, they don't transfer much data to and from the GRAM.

Wouldn't that board explode if you tried to draw power from all those little slots? Does it prevent the graphics cards using board power?
 
Wouldn't that board explode if you tried to draw power from all those little slots? Does it prevent the graphics cards using board power?
GPUs have power cables directly coming from the PSU, the risers also have a 6 pin or molex or sata power input. So, it won't draw "a lot" of power and kill the mobo.
 
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