2008 MacPro (3,1) 8 HD's Missing Power?

Discussion in 'Mac Pro' started by RipperG, May 17, 2016.

  1. RipperG macrumors newbie


    Aug 26, 2009
    Hello All,

    I don't know how many 2008 Mac Pro owners are still here! Here are my specs followed by my problem:

    2008 Mac Pro 3,1 2,8 Ghz eight core
    • 24 Gigs of Ram in all slots (4x2+ 4x4)
    • PCIe slot I Nvidia GTX 970 Gaming 4G Video card
    • PCIe Slot 2 Apricorn Velocity Solo X2 (MAC OSX on SSD Samsung EVO 840 Pro)
    • DriveBay 1 SSD (Samsung EVO for Windows 10)
    • DriveBay 2 SATA 1 TB Hard Drive
    • DriveBay 3 SATA 1 TB Hard Drive
    • DriveBay 4 SATA 1 TB Hard Drive
    • Optical Drive LG BLueRay Burner (WH12LS30)
    • Optical Bay 2 MaxConnect for Mac Pro [2006-2008] Optical Drive Bay Disk Mounting Assembly [SZ- MCMPOPT04] with two 1TB Sata drives installed connected to the 2 extra seat ports on the Mobo
    • Finally with some velcro I have an eighth HardDrive Installed under my Bay 1 SSD (mounted from my Apricorn Velocity card)
    Ever since I installed the GTX 970 video card (requiring more power than my previous GTX 750) both Hard drives in optical Bay 2 spin up and I see them appear on my desktop but then they slow down and disappear from my desktop and then give me the ''Click of Death''

    Is there a software tool that I can install to monitor the total power demand on my system? I am pretty sure that the 980 watt power supply is maxed out.
  2. ActionableMango macrumors G3


    Sep 21, 2010
    I use HardwareMonitor but I don't know if it provides totals or not.

    However, there's nothing particularly demanding in your list. Sounds like dying hard drives to me. I hope you have important data backed up somewhere else.
  3. Ph.D. macrumors 6502

    Jul 8, 2014
    Have you put your old 750 back in? Does everything work again?

    Those theoretical 980 watts is a lot of power. It's being divided up here and there, but somewhere, somehow, trying to pull near that much power in real life will cause problems. With drives in the optical bay, and everything else (eight drives plus various support electronics!?), I think this machine is close to being maxed out, power-wise. I'm not saying you are exceeding total specs in a theoretical sense, but my guess is that you may be close to exceeding power limits on some of the rails. While the 970 may not be causing the problem directly, it may be bleeding power from somewhere else that apparently needs it more.

    My recommendation is that you back off on total power consumption where that's not too inconvenient and see if things get back to a stable situation.

    (I do have an octo 3,1.)
  4. RipperG thread starter macrumors newbie


    Aug 26, 2009
    The drives are fine. When I put them in one of my four bays they run just fine.
    --- Post Merged, May 24, 2016 ---
    Yes a real bummer! When I run my four drives from Bay 1 to 4 and the two ssd's off my Apricorn, I am fine! Guess the power just can't handle what I am throwing at it! With the GTX 750 all my eight drives work no problem. I use TG Pro to monitor my Mac's temperature but no power options.

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3 May 17, 2016