3 gpu rx 580 fxf conect to corsair tx850m psu

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oborocm

Apr 18, 2018
11
0
10
Hello to all,
Corsait tx850m have 2 lanes of PCIe Connector with 2x 6+2 pin
it will be correct to connect like this for 3 rx 580 xfx :
from first lane with 8 pin conect one gpu
from second lane with 8 pin conect secont gpu
from first lane with 6 pin cable and second lane with another 6 pin cable and use the adaptor 2 x6 pin to 8 pin to connect the third gpu ?

i
 
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Z

zyh1987

Estimable
Mar 16, 2018
2,146
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3,065
i don't think it's a good idea to do that.
you would want to have a higher power supply with individual wiring bundle for each of the pins.

here are my concerns,
the wire may run very hot and cause fire.

drawing 75w x 3 from atx24 at motherboard.
drawing 150+75w from 8 pin (likely, each lane is rated for either 1 8 pin or 2x6 pin)
running all card and cpu would have a max power draw at 250+250+250 + 100 on the 12 v rail. which exceed your 850w, i think your outputs 70a on 12v maximum, at maximum load, the psu is not where efficient and effective. i would say get a proper psu 100w with 3 individual 8 pin perhaps with eps connector too (should be common in big psu unit). also try to get amotherboard with eps connector, which will allow more 12v power draw from the board.
 
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oborocm

Apr 18, 2018
11
0
10
thnx a lot for your answer!
i want to build a rig for ether mining, the end should looks like 2 psu 850w corsair tx850m and 6 GPU xfx rx 580 on ASRock H81 PRO BTC R2.0 Motherboard ATX LGA 1150.
Now i have finance for one PSU and 3 GPU. After this i suposse to buy another PSU corsair 850w and synchronize
together. Or it will be correct to run now 2 gpu on this 850w PSU and after to buy another 1000w corsair? or all 6 rx 580 will be good with 2 PSU 850w ?
thnx!
 
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zyh1987

Estimable
Mar 16, 2018
2,146
9
3,065
the card uses a 8pin, plus pci-e lane, capable draw 75w from the pcie lane and 150w from the lane. so the max power draw from the card is 225w. (i made an error on my previous calculation). of course real world number will be somewhere in between of 150 and 225. otherwise, it would use a 6pin connector instead. i'm thinking the card is probably using around 180 - 200 of power under full load. which is 650w-700w. (200-200-200+100), as i said earlier, you are maxing out your psu 12v. and those wires will get quite hot.

personally i'm not comfortable push so close to psu's max limit especially on a 24/7 mining system.
the psu itself is a very good psu, able to push to max limit with out any issue.
you might also want to keep a close eye on it.

 
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oborocm

Apr 18, 2018
11
0
10
ok. thnx for your opinion.
i will tray to get another PSU, CORSAIR - HX Series 1000W that have 4 lanes pci e.
you are right, beter to spent somme money and not to burn the house
thnx a lot!

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