multiple psu's per computer

[chowdan]

Hey guys,

was hoping someone on here could give me some assistance on getting a secondary PSU online for my final GPU.

I currently am waiting on a modular PCIe 6pin plug for my final GPU but was hoping i could mod my spare PSU to allow me to run the final card.

Anyone have any tips/tricks on how i can do this?

[nachius]

f you jumper (paperclip or wire) the Green and a black pin in the ATX connector this will power on the PSU allowing you to plug in cards, fans, etc.  Just like it was switched on by a computer.  they make connectors that makes this cleaner, but if this is temporary that is your quick fix.

If you can find info searching there are plenty of links out there with pictures how this is done.

[crazyates]

I bought 2 PSUs for a new rig, only thinking I was gonna put 4 GPUs on it. I ended up getting 5 GPUs working, so I had to add a third PSU.



Left PSU powers 2 GPUs and all 4 of the risers.
Middle PSU powers 1 GPU and that same GPU's riser.
Right GPU powers 2 GPUs and the MB.

Paper clip to jump start the left two BEFORE you turn on the MB, and they're all working. Rosewill Capstone 750 80 Plus Gold.

[chowdan]

Thanks guys!

I did get the psu working with a paper clip. The wire that i was using prior to the paper clip was a bit too thin so it wasn't making proper contact. The paper clip works perfectly.

Only issue im seeing now is CGMiner seems to sit on starting up but never actually gets to the point where it "should" start mining. It usually just shuts down. I've changed my config to only state the pool server, -u -p and -i 10.

Any ideas?

[crazyates]

Only issue im seeing now is CGMiner seems to sit on starting up but never actually gets to the point where it "should" start mining. It usually just shuts down. I've changed my config to only state the pool server, -u -p and -i 10.

If you're mining scrypt, you need to specify --sycrpt and a few other settings, like --shaders or --thread-concurrency .m

[chowdan]

Only issue im seeing now is CGMiner seems to sit on starting up but never actually gets to the point where it "should" start mining. It usually just shuts down. I've changed my config to only state the pool server, -u -p and -i 10.

If you're mining scrypt, you need to specify --sycrpt and a few other settings, like --shaders or --thread-concurrency .m

Still no luck.

Pulling that 6870 offline seems to allow me to mine with the 7850 and the 2 7870's. I've tried switching the second PSU to power one of the 7870 and put the main PSU on the 6870, 7870 and 7850 and still no luck.

My .bat file currently is:
cgminer.exe --scrypt -o stratum+tcp://gigahash.wemineltc.com:3335 -u USERNAME -p PASSWORD -I 10

i've tried every possible combo of -d #. I've changed the password, created new workers all without luck.

Does the 7870 drivers include drivers for a 6870?

I'm running the 13.4 and the 2.9 SDK. The 13.4 driver was downloaded for the 7870 and installed while ALL cards were online. I've uninstalled reinstalled to verify and still no luck.