I would try using PSU2 for the motherboard/CPU/drive. EVGA PSUs are generally good, but the lower-end (650/550) G2s are often better than their GS counterparts (both supplies are still manufactured by Seasonic, iirc), and I'd try keeping the better of the two as the primary PSU. This shouldn't matter if both PSUs are working as intended, but it's an idiosyncrasy of mine.
For a dual PSU setup that you're doing manually (without some special cable or fancy ADD2PSU), you need to have the pins (green to any ground on the main 20/24 pin connector) shorted on the secondary PSU prior to booting up the system. Don't try timing it to turn on the second PSU immediately after; there's no need.
Thankyou, I will make sure that the G2 PSU is set to be PSU1 - I shall continue to short the green/black pins prior to boot attempt
How many cards (and which) are you planning on running on this rig? You initially mentioned that you have 4x RX 470 cards, but your diagram shows 6 cards, and later you mentioned having RX 570s, so I'd just like to know what your goal is for this rig.
I have four RX470s (sold two) and two RX570s (four on pre-order...still). I plan on eventually running the four RX470s on my other mobo which is an Asrock H81 BTC (non-Pro) and then running the six RX570s on the H81 Pro BTC. For now though, im just trying to get as many cards online as possible, but am faced with the dual psu issue
I haven't thoroughly checked what connectors your PSUs should have available, so let us know if there's any kind of limitation there.
There doesnt seem to be any limitations with the connectors - they come with quite a fair few and so I havent had any issues except for having to use the SATA to MOLEX adaptors in order to boot...
For a dual PSU setup that you're doing manually (without some special cable or fancy ADD2PSU), you need to have the pins (green to any ground on the main 20/24 pin connector) shorted on the secondary PSU prior to booting up the system. Don't try timing it to turn on the second PSU immediately after; there's no need.
Thankyou, I will make sure that the G2 PSU is set to be PSU1 - I shall continue to short the green/black pins prior to boot attempt
How many cards (and which) are you planning on running on this rig? You initially mentioned that you have 4x RX 470 cards, but your diagram shows 6 cards, and later you mentioned having RX 570s, so I'd just like to know what your goal is for this rig.
I have four RX470s (sold two) and two RX570s (four on pre-order...still). I plan on eventually running the four RX470s on my other mobo which is an Asrock H81 BTC (non-Pro) and then running the six RX570s on the H81 Pro BTC. For now though, im just trying to get as many cards online as possible, but am faced with the dual psu issue
I haven't thoroughly checked what connectors your PSUs should have available, so let us know if there's any kind of limitation there.
There doesnt seem to be any limitations with the connectors - they come with quite a fair few and so I havent had any issues except for having to use the SATA to MOLEX adaptors in order to boot...
It sounds like you have a bad PSU. A 650w PSU functioning normally can run 2 of your video cards with no problems. It sounds like there is either a short in one of the video cards causing it to fail or the PSU itself is the problem.
Both PSUs run two GPUs and the mobo just fine on their own.. its only getting them both to boot at the same time with four cards plugged in.. one of the PSUs will then invariably click and not boot...
Also, the Molex to Sata 'problems' that people on this forum warn about are non existent. As long as you only plug in 2 risers per chain on the PSU you will be fine. They wont burn up unless you overload the 12v wire powering the chain of SATA plugs. I have literally THOUSANDS of molex to sata connectors powering graphics cards without ever once having a single failure on the adapter line.
That is very good to hear.. I have noticed that the adaptor at the point it changes from male to female SATA gets warm to the touch. I have been checking this temp and it has been running stable for the last few days. Its odd that the PSU clicks and fails to boot when the adaptors are not plugged in? Could the adaptors be acting as a very small resistor (hence their warmth) and giving the PSU a bit of slack upon boot up?
Both PSUs run two GPUs and the mobo just fine on their own.. its only getting them both to boot at the same time with four cards plugged in.. one of the PSUs will then invariably click and not boot...
Also, the Molex to Sata 'problems' that people on this forum warn about are non existent. As long as you only plug in 2 risers per chain on the PSU you will be fine. They wont burn up unless you overload the 12v wire powering the chain of SATA plugs. I have literally THOUSANDS of molex to sata connectors powering graphics cards without ever once having a single failure on the adapter line.
That is very good to hear.. I have noticed that the adaptor at the point it changes from male to female SATA gets warm to the touch. I have been checking this temp and it has been running stable for the last few days. Its odd that the PSU clicks and fails to boot when the adaptors are not plugged in? Could the adaptors be acting as a very small resistor (hence their warmth) and giving the PSU a bit of slack upon boot up?
