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With 2 friends we are going to invest some € in mining, I want before clicking the order button to be good. Can you guys tell me if I forgot anything? Also, do you know any blueprints/plans to build rigs in aluminium/wood ? I can't find any in stock in France so I'm going to build them.
Here is the setup (4 in total) - Managed to secure 24 MSI RX570 GAMING X 4Gb :

MSI Radeon RX 570 GAMING X, 4 Gb   24x224 €
COOLER MASTER V1200 Mod. 80+Plat.   4x274 €
ASUS PRIME Z270-P iZ270 USB3.1 LGA1151   4x140 €
INTEL Pentium Dual Core SKYLAKE G4400   4x60 €
KINGSTON DDR4 2400 8Go   4x72 €
SSD KINGSTON UV400 120Go   4x75 €
PCI E Riser   24x10 €
Power Button   4x2 €
Price per unit      2027 €
Total order      8108 €

Adding the cost of the aluminium frame etc let say 8500 € of investment. Breakeven expected in 4-5 months?

Is there any difficulties to mine with Z270 motherboards?

Thanks  for the advices

The ASUS Z270 PRIME A / AR is verified to do 9 cards, 264 MH/s per rig if you add M.2 to PCI-E expansion adapters.

https://www.youtube.com/watch?v=pQ-EAunoAqY

That would lower your costs to 3 sets of motherboards, CPU's, RAM and SSD's.

I recently did a build of the BBT mining case below out of two 8ft pieces of 1/8" x 3/4" angled aluminum, one 8ft 1" x 2" piece of pine and #8 1/2" self-tapping screws. The case will fit up to 7 RX 4XX/5XX if you put them about 1 inch apart. For 9 GPU's I would increase the length of the longest frame section by 7 inches from 19.2 to 26 inches and I would also increase the frame height by 2 inches from 9.25 to 11.25 inches, which means you will need to use three 8ft pieces of 1/8" x 3/4" angled aluminum instead of two.

https://www.youtube.com/watch?v=D5xNrlxsCVs

BBT on YouTube said he will have a mining rig case build video next week with updates from his original video.

Where did you find the gpus?

I can confirm the board you selected works just fine with 6. If you go with 9 you will most likely run into a bunch of problems that create more downtime and increase ROI time.

The electricity cost will kill you.

I think you are wrong to go this way.

do ½ your way do ½ this way if you can get prices

wait for quote take a minute.  build two of mine and two of yours

Would love to know this to if you don't mind sharing OP.  I have been looking on/off for RX 570's and have had 0 luck.  To secure 24 you must have a good source.  I would make sure that your deal is "secured" before buying all other gear.  As I would hate to buy all other gear then have it sitting trying to get GPU's.  (You could switch GPU's but that is kinda another topic)

That's my question. Where are you getting these cards?

"Breakeven expected in 4-5 months?"

The way the difficulty is going, your 4, 5 months will become 4, 5 years and that if eth does not crash hehe.

I'm mining with 7 GPUs on that board, have yet to try 8.

Might take a while for your products to actually arrive.
Don't expect the market to remain as it is, or grow, I mean it can, it can also become 2013 all over again. Beware

Don't forget electricity, space, a lot of generated heat, and possible replacements.

I think it's a good choice to start mining, but do so with eyes open

keep your options open, a lot are getting into mining and difficulty is rising, you might be better off investing it in btc not mining.

i prefer gtx cards better options on coins, less profit but better chance of resale.

look at the last month:

https://www.coinwarz.com/difficulty-charts/ethereum-difficulty-chart

difficulty on its own is not a good barometer, the price of ethereum has increased.

So to reply to the main question, the reseller is a small shop in a small city in France. I contacter many big resellers who wasn't able to snatch any, and this guys told me that he could get for monday 20 RX 570, and I would catch the 4 other on backorder. --> I get all hardware from him, so he only gets the money if he delivers everything.

The idea behind this is to build a small business: with my friends we are looking into in some investment and that 8K would not be the whole of it. It's just a starting point to see how it goes. I know the difficulty is raising but the exchange rate is also crazy high...

Correct me if i'm wrong: let's say I have those 24 card running, but we have more ready to be invested, I could invest into new hardware (Vega? Volta?) or "simply" change currency?

I know it is extremely risky but we are not looking to do it as a hobby but as a business, and as with all business opportunities, if you do go big at the beginning (and I know we are catching the wagon late)  you are ******.

If i'm dead wrong correct me!

At the moment here is what we have/expect:
50M2 cooled place
0,14€/KW Electricity
Run a month with the 24 card and see what would happen
After this period decide if we invest more, decide a strategy etc.

I'm completely open to you advices/observations.

Why the i5 7400t vs a G4400 for about 70 less?
What 128gb SSD are you using for 40?

I would even say, why not a G3900 ? Cost even less

SSD isn't needed, you can get a 50-80 gig HDD for less than 10 where I live or boot off of a USB. Even more money shaved off the build. You can get by with 4GB of DDR but it may cause some compability issues with some software.

Just keep in mind that there are 10,000 or 100,000 other people doing the same thing and that the profitability isn't going to hold.

I think Phil's suggestion to build a 3-card rig makes a lot of sense, but I would swap out his mobo suggestion with one that can eventually accomodate  6 or 7 gpus, like the Asus Z270 Prime A board.  It might cost you $20 more, but this is a drop in the ocean with the going profitability, right?

Its not a question of price. With friends we want to see the first months profits, and then invest BIG. So in 1 month i'm pretty sure it will not be late to get Nvidia's card for Zcash or Zpool.
The opportunity to get 20x RX570 is not offered to everyone so I think it would be a mistake to not take them.

Now I know where all MSI RX 570 went...to France!  ;D
There are none around here (south US) and none in US at all (newegg is empty).
Anyway, good mining!

I just had my reseller, at the end he received "only" 10 cards, and he will maybe get 10 others next week.
Honestly it was PURE luck to get them... I tried many reseller and it's the smallest one who gave a **** about me and sourced the cards. Bigger haven't yet sent me invoices, they did not car at all !

with european power costs u should have went with 1070s

I got my 570 @ 224€, 1070 are about 340€, I don't see how I can achieve ROI faster with that price difference...

Do gtx cards benefit a lot what happens with BTC? Perhaps investors are turning to gtx cards whose marketing is more efficient

not noticed there are so many coins offering good daily returns i can choose everyday.

It is not an insane purchase, you just need to make sure that you get everything that you can out of it before you hit the wall.  There will be a point in time when this is not going to cut it anymore.  When the ROI starts to drop, you can try switching down the line to a few coins that are not being nailed to the wall and that should buy you a few months and after that, it is simply time to upgrade.