Quote from: Vann on May 10, 2017, 05:00:48 AM

In researching the dual psu power issue i've heard some advocate powering the riser and PCI-E power connector on the card with the same PSU. Others say the psu that powers the motherboard must also power alll the risers. The slave psu should only power the PCI-E power connector on the card. Haven't found a definitive answer but it seems the people having cards die were using the slave psu to power both the risers and the PCI-E power connector on the card.

https://bitcointalk.org/index.php?topic=1761303.msg17827649#msg17827649

I'm pretty sure that's a myth that keeps getting re-hashed(for some reason) from the ribbon powered riser days..
(this coming from a guy that just murdered 2 cards tho.)
Usb powered risers seem to be totally independent. I've been running dual psu's for months in pretty much any fashion without issue(until now.) even non-grounded together.

Case in point: When said idiot forgot to turn off the second rig/psu before uplugging the pcie and molex from his poor 480.. that psu was powering both riser and gpu. it was also powering 1 570 the same way.. all 6 570's survived. The massive back surge when unplugging the pcie connector is (most likely) what took out the 470 that was plugged into the motherboard slot on the second rig.. yet the 480 + 470 on risers survived.(slot still works fine)

I dunno, just ordered a server psu to play with.. maybe I'll end up frying all my cards/burning the house down :/

ogre9000

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