9 Replies Latest reply: Aug 13, 2010 2:37 PM by The hatter
R D Salinas Level 2 Level 2 (255 points)
So, does anyone know how many extra auxiliary power cables are available in the new Mac Pros?

For example, it looks as though the ATI Radeon 5870 requires TWO auxiliary power cables hooked up to it. But I'm also thinking of installing an additional Nvidia 8800GT and wanted to know how many auxiliary cables are available. I wasn't sure if I could chain them or if I was going to have to buy new power cables if I wanted to start adding more than two cards.

Mac Pro 3Ghz/11GB RAM/NVIDIA GeForce 8800 GT, Mac OS X (10.6.2)
  • The hatter Level 9 Level 9 (60,575 points)
    You would need a small PSU in the lower optical bay, 450W PSU $40 or less to add more. This was done with GTX 285 and ATI 4870.

    Give me a PSU with higher efficiency and where I can plug in some cables.

    Two aux - the same as all other Mac Pro models.
  • romko23 Level 2 Level 2 (395 points)
    You mean Mac Pro 4,2 - the 2010 is nothing more than a 2009 except it has westmere and new gpus.. Sandy bridge should be called 5,1... FOr me, the 2010 is called: 2009 w/westmere..

    I refuse to acknowledge it as a different machine since it uses the same 2009 logic board(no mods to it due to tick tock), and the processor trays are the exact same as on the 09.. except for the firmware flash to B1.
  • R D Salinas Level 2 Level 2 (255 points)
    romko23 wrote:
    You mean Mac Pro 4,2 - the 2010 is nothing more than a 2009 except it has westmere and new gpus.. Sandy bridge should be called 5,1... FOr me, the 2010 is called: 2009 w/westmere..

    I refuse to acknowledge it as a different machine since it uses the same 2009 logic board(no mods to it due to tick tock), and the processor trays are the exact same as on the 09.. except for the firmware flash to B1.


    Correct. I just bought up the 5.1 model since I'm going buy a new Mac Pro (12 core one) and figured I make sure that it wasn't any different than any of the other Mac Pros. I have the 3Ghz dual-core 1.1 model and it too only seems to have two auxiliary power cables available for my two Nvidia 8800GTs. But in my new Mac Pro I want to use the ATI 5870 (which requires two power cables) and an additional Nvidia 8800GT which means NO power available for that card until I buy some additional PSUs, at least according to the hatter.

    Hatter, any websites you can recommend so I can buy some of these parts ahead of time?
  • The hatter Level 9 Level 9 (60,575 points)
    I have some bookmarks and there was a write up on accelerateyourmac.com

    The nice thing is that OpenCL automatically uses all GPUs (and CPUs if you want)

    http://www.xlr8yourmac.com/archives/apr10/043010.html#S26879

    Newegg had 450W I mentioned in $39 range. And that probably came from MacRumors or somewhere else. So I can't find the original (and I know I bookmarked it).
    And I have spent a lot of time trying to find product and review.

    Finally... NEVER had any experience, so just pointing to possible (and this looks good but not what a thread post or user mentioned) is just $20?? but Newegg reviews look good:

    *ePOWER EP-450CD 450W ATX12V / EPS12V Modular Power Supply*
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817101044

    There is this on using dual 4870s:
    http://forums.macrumors.com/showthread.php?t=665034

    Take a look at this photo, a 6-pin requires two distinct molex. And not via splitter. So I'd go PSU route.

    http://www.thermaltakeusa.com/product/power/purepower/w0099/w0099.asp
    http://www.thermaltake.com.au/Products/PowerSupply/W0157/Toughpower450WExpress.a spx

    Would be interesting if they call it 4,2. I am surprised there is no Mid-2010 name except on Crucial, or distinct forum category (would be better to just lump everything together and have been areas: graphics, memory, storage, PCI Expansion maybe).


    http://www.amazon.com/Cables-Go-35522-Express-Adapter/dp/B000NK7ML2/

    The VisionTek 450W Dedicated Graphics Power Supply is designed to work with your existing power supply providing efficient Power Solution. It gives extra power for single cards, SLI, Quad SLI, CrossFire, CrossFireX and desktop/server CPU’s. Additionally, the VisionTek 450W Dedicated Graphics Power Supply offers synchronized “power ON” with the main power supply. Moreover, the VisionTek 450W Dedicated Graphics Power Supply's 5.25” bay size compliant power supply is ideal for “small form factor” PC’s, Gaming PC’s and business servers.
    http://www.amazon.com/450W-Graphics-Power-Supply-Juice/dp/B001AO4O98/


    4870 and/or GTX 285 dual GPU - and Nvidia for their GPGPU/CUDA ability has gotten VirginiaTech and the military's attention.

    ATI or Nvidia?
    http://www.geek.com/articles/games/macpro-whats-better-ati-radeon-4870-or-nvidia -gtx-285-20090720/

    edited hatter
  • R D Salinas Level 2 Level 2 (255 points)
    Great information! All this mod'ing talk has me thinking...considering that I'm getting one of the newer Macs means I can run Windows 7 (64 bit) without any Mac RAM limitations (up to say, 6-8GB of visible RAM).

    That means I can run a ATI Radeon 5870 on my Mac side and an Asus GeForce GTX 295 on my Windows 7 side (this would require four power cables; 2x per card).

    Why all this power, you ask? So I can play Bejeweled and Minesweeper of course!
  • The hatter Level 9 Level 9 (60,575 points)
    Up to ONLY 8GB? Try 32GB or more, there is no such 8GB limit.

    But if you get a dual processor, you need Pro or Ultimate.

    Home Basic: 8GB
    Home Premium: 16GB
    Professional: 192GB
    Enterprise: 192GB
    Ultimate: 192GB

    Only issue might be how well if at all they can co-exist. Whether you'd have to disable the ATI in Windows, but hopefully the 295 would show as single 285 and handle some CUDA type tasks and off load rendering.
  • R D Salinas Level 2 Level 2 (255 points)
    The hatter wrote:
    Up to ONLY 8GB? Try 32GB or more, there is no such 8GB limit.

    But if you get a dual processor, you need Pro or Ultimate.

    Home Basic: 8GB
    Home Premium: 16GB
    Professional: 192GB
    Enterprise: 192GB
    Ultimate: 192GB



    Well, currently I'm running XP 32 bit on my Mac 1.1 and it wont show more than 2GB. So, this is the limit I was referring to. Even XP 32-bit on PCs have a 4GB limit. Also, if Windows 7 Home Premium supports 16GB that doesn't mean the Mac's ROM will allow it on Mac 1.1s.

    http://support.apple.com/kb/HT1846

    Currently Physical memory limits for Windows XP versions:
    Windows XP Professional: 4 GB (32bit) 128GB(64bit)
    Windows XP Home: 4 GB(32bit) N/A(64bit)

    My Mac 1.1 wont run XP 64-bit version so that's not an option. And it wont run Windows 7 32 or 64-bit. I wont touch Vista 64-bit, so don't even mention it.

    The whole issue with the 1st Generation Mac Pros is trying to run any 64-bit Windows without the name "Vista" in it. :P So, the new Macs (2008 and later) support 64-bit version of Windows 7, then I'm good to go with my 16GB of RAM. I'll run 192GB as long as you buy it for me! :D*

    * The last statement was a joke. Please don't reply that Mac Pros don't support 192GB. I know.
  • R D Salinas Level 2 Level 2 (255 points)
    The hatter wrote:

    Only issue might be how well if at all they can co-exist. Whether you'd have to disable the ATI in Windows, but hopefully the 295 would show as single 285 and handle some CUDA type tasks and off load rendering.


    Yeah, there's some discussion in some links that you provided about dual card setups in which one dual-powered card ran OS X and the other dual-powered card ran Windows 7.

    I'd have to read more about if they can play well together.
  • The hatter Level 9 Level 9 (60,575 points)
    I have run Vista SP1 64-bit and later, including Windows 7 Pro x64 on Mac Pro 1,1.

    Yes, 32-bit Home Premium is also affected and limited to 1.9GB which was why I took the extra step necessary to reburn the DVD to work.

    And 7 runs just fine and uses full hardware to its potential just fine.

    Apple never supported or provided drivers for XP 64-bit though a few adventurous souls did manage.

    OS X Server in 64-bit kernel mode will now finally with 10.6.x use 64GB physical RAM; OS X Client 10.6.x in 64-bit kernel mode can use 48GB RAM; but those require Mac Pro 2008 or later, UEFI 2.x (EFI64).

    http://jowie.com/blog/post/2008/02/24/Select-CD-ROM-Boot-Type-prompt-while-tryin g-to-boot-from-Vista-x64-DVD-burnt-from-iso-file.aspx