Ninjastic
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Board Mining (Altcoins)
Re: [ANN] cudaMiner - a new litecoin mining application [Windows/Linux]
by
KoSoVaR
on 27/02/2014, 04:16:13 UTC
Quote from: Thirtybird on February 26, 2014, 10:38:14 PM
Quote from: cbuchner1 on February 26, 2014, 10:19:58 PM
Quote from: KoSoVaR on February 26, 2014, 09:29:46 PM
Still doesn't explain why the first 4 cards are legit, the 5th is half ass, and the 6th is non existent.  They are all recognized, powered on, and spinning.  I'm writing something to see if I can send some work to the 6th card via cuda.

yeah, the RF engineer in me is clueless about that. :-)

oh wait... idea: the 5th and 6ths PCIe slots are farthest away from the northbridge/CPU though. Now add the USB cable length...

I studied communications engineering, but I mainly focus  on protocols, software stacks, simulation of radio systems. My HF/RF knowledge is pretty rusty :-)

The troubleshooter in me says to take out the middle two cards (middle PCIe slots) and see how many cards you see.  If it's 4, it may just have to do with the number of cards being seen by the system.  Maybe the BIOS runs out of memory trying to address that many cards.  Make sure all the features you don't need are turned off in BIOS... all the fun stuff Smiley


I think you're right with the BIOS running out of memory trying to address all the cards, but I'm still seeing low hash on the last PCI-E lane.  I removed *all* cards and seeing 200khash.  On the first lane it's 265khash at stock speeds which goes with what I'm seeing on the rest of the cards.

  • With 1 card in the first slot we're hashing @ full speed 265khash
  • With 1 card in the last mobo slot we're hashing at 175-200, after 5min it's settled at 175khash.  This is the SAME card going from 1st to last slot
  • So first 4 cards *always* work.
  • The 5th card is lower hash (half, maybe less...)
  • 6th card recognizes but doesn't hash...

I've used this same board as I've previously said with 6 x R9 280X GPUs all hashing at full, overclocked speed.  I'm also using ALL powered risers.

Here's some hardware/software details:

Mobo:  GIGABYTE GA-F2A88X-UP4 FM2+
GPU:  6 x MSI GAMING N750Ti TF 2GD5/OC (http://www.msi.com/product/vga/N750Ti_TF_2GD5OC.html)
PSU:  Corsair AX760i
CPU:  AMD A4-5300
RAM: 2x4GB modules
OS:  Xubuntu 64bit (previous post has my step by step configuration software wise)

With the 6 x 280X I had a 1500W PSU and a 1000W PSU rigged up together.  It hashed for weeks with no hiccups.  I'm really at a loss as to why this setup wouldn't work.  PCI-E was set to auto or 2x in BIOS, I never tried 1x.  

Any ideas?