MP 1,1-5,1 Dual GPU MP 1,1 Need help

[Nicholas Bigatel]

I've combed through all the old threads trying to find an answer, please direct me to the appropriate place if my question has been answered.
I'm running a 2007 Mac Pro (Specs Below), That I am attempting to add a second graphics card so that I can run 3 monitors in my recording studio. The first card is GeForce GT120 (Slot 2) and the new one is a Geforce 8800 GT (Slot 1 with 6 pin power hookup). Both work independently but i cant get them to work simultaneously. I have reset my PRam and SMC and tried different PCI Express Profiles but can't get them to fire up together. When they are both in, only the GT120 works no matter what PCI slot it is in and it wont boot if a monitor is plugged into the 8800.

Current PCI express profile: two x8 lanes (1&2)

What am I missing here? Help please.

OS: 10.10.5 Yosemite
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2 GHz
Number of Processors: 2
Total Number of Cores: 4
2 Cache (per Processor): 4 MB
Memory: 32 GB
Bus Speed: 1.33 GHz

 

[AlexMaximus]

Where did you get the 8800 GT card? -> There has been two different versions of the Mac Edition 8800 card. -> one for the MP 1.1 and one for the MP 3.1. If you have the wrong one, it might be the source of the problem. -> my two cents, check out the version numbers/stickers/firmware.. worth a shot...

 

[Snow Tiger]

I've combed through all the old threads trying to find an answer, please direct me to the appropriate place if my question has been answered.
I'm running a 2007 Mac Pro (Specs Below), That I am attempting to add a second graphics card so that I can run 3 monitors in my recording studio. The first card is GeForce GT120 (Slot 2) and the new one is a Geforce 8800 GT (Slot 1 with 6 pin power hookup). Both work independently but i cant get them to work simultaneously. I have reset my PRam and SMC and tried different PCI Express Profiles but can't get them to fire up together. When they are both in, only the GT120 works no matter what PCI slot it is in and it wont boot if a monitor is plugged into the 8800.

Current PCI express profile: two x8 lanes (1&2)

What am I missing here? Help please.

OS: 10.10.5 Yosemite
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2 GHz
Number of Processors: 2
Total Number of Cores: 4
2 Cache (per Processor): 4 MB
Memory: 32 GB
Bus Speed: 1.33 GHz

Hmmm ... not certain why you are having issues with the two GPUs .

But your Mac would just love to have an EFI ATI 5770 installed . You'll get all three channels of video with one mini DP active ( powered ) adapter in use . The other two can have direct passive connections or adapters . Two mini DP and one DL DVI is the Apple card you want , looks like this :

[automerge]1579306613[/automerge]

Where did you get the 8800 GT card? -> There has been two different versions of the Mac Edition 8800 card. -> one for the MP 1.1 and one for the MP 3.1. If you have the wrong one, it might be the source of the problem. -> my two cents, check out the version numbers/stickers/firmware.. worth a shot...

Yeah ... only the 32 bit version of the 8800 will work in his model . His GT 120 is definitely 64 bit . That might be the source of the conflict - trying to run 32 bit and 64 bit cards at the same time .

The 64 bit version of the 8800 will not work in this model at all .

 

[Nicholas Bigatel]

Where did you get the 8800 GT card? -> There has been two different versions of the Mac Edition 8800 card. -> one for the MP 1.1 and one for the MP 3.1. If you have the wrong one, it might be the source of the problem. -> my two cents, check out the version numbers/stickers/firmware.. worth a shot...

I got it used on eBay. I’ll try to find the model number thanks.
[automerge]1579308986[/automerge]

Hmmm ... not certain why you are having issues with the two GPUs .

But your Mac would just love to have an EFI ATI 5770 installed . You'll get all three channels of video with one mini DP active ( powered ) adapter in use . The other two can have direct passive connections or adapters . Two mini DP and one DL DVI is the Apple card you want , looks like this :

View attachment 889308
[automerge]1579306613[/automerge]


Yeah ... only the 32 bit version of the 8800 will work in his model . His GT 120 is definitely 64 bit . That might be the source of the conflict - trying to run 32 bit and 64 bit cards at the same time .

The 64 bit version of the 8800 will not work in this model at all .

This makes sense.. a bummer but makes sense.

 

[Nicholas Bigatel]

Hmmm ... not certain why you are having issues with the two GPUs .

But your Mac would just love to have an EFI ATI 5770 installed . You'll get all three channels of video with one mini DP active ( powered ) adapter in use . The other two can have direct passive connections or adapters . Two mini DP and one DL DVI is the Apple card you want , looks like this :

View attachment 889308

If I were to get one of these would it need flashed?

 

[Nicholas Bigatel]

I just ordered a second 8800 gt. Will update when it it arrives.

 

[Snow Tiger]

Hmmm ... not certain why you are having issues with the two GPUs .

But your Mac would just love to have an EFI ATI 5770 installed . You'll get all three channels of video with one mini DP active ( powered ) adapter in use . The other two can have direct passive connections or adapters . Two mini DP and one DL DVI is the Apple card you want , looks like this :

View attachment 889308

If I were to get one of these would it need flashed?

Nope . it's a real Mac Edition with boot screen and EFI functions .

That's the beauty of obtaining the EFI ATI 5770 card - it works with all the cMPs . There is a minimum macOS version requirement , though - I think it's Snow Leopard 10.6.4 .

[automerge]1579366578[/automerge]

I just ordered a second 8800 gt. Will update when it it arrives.

I hope your seller knows the difference between the 32 bit ( 2006-07 Mac Pro ) version and the 64 bit ( 2008 Mac Pro ) version of this card . They are very hard to tell apart . You need 32 bit . The 64 bit version is incompatible with your Mac . Check the APN first .
[automerge]1579366795[/automerge]

 

[Nicholas Bigatel]

I got my second 8800 installed and everything works great now. My Money is on the 32/64 bit compatibility between the 8800 and the 120. Thanks for replying folks.

 

[Alex.Toronto]

Sorry this is off topic for your post, but I would love to know how you got your 1,1 up to Yosemite! Did you have to replace the processors? I have a Mac Pro 1,1 with 2 Dual-core intel xeon processors (3.0). Any links or advice you might have would be appreciated! My computer is less and less useful by the day because it's stuck at 10.6.8.

 

[Nicholas Bigatel]

Sorry this is off topic for your post, but I would love to know how you got your 1,1 up to Yosemite! Did you have to replace the processors? I have a Mac Pro 1,1 with 2 Dual-core intel xeon processors (3.0). Any links or advice you might have would be appreciated! My computer is less and less useful by the day because it's stuck at 10.6.8.

I can’t remember the exact process I think there was a modified boot file and maybe a modified copy of the OS installation. It was pretty quick to find with google “yosemite mac pro 1,1”

also here’s an update of my workstation after my new gpus

 

[Snow Tiger]

Sorry this is off topic for your post, but I would love to know how you got your 1,1 up to Yosemite! Did you have to replace the processors? I have a Mac Pro 1,1 with 2 Dual-core intel xeon processors (3.0). Any links or advice you might have would be appreciated! My computer is less and less useful by the day because it's stuck at 10.6.8.

Ah , 10.6.8 ... that was a fine vintage . The very last real desktop Mac OS .

But , if you must , there is a firmware upgrade utility to turn your Mac Pro 1,1 into a 2,1 . Perform this firmware upgrade first , before the other upgrades below .

Mac Pro 2006-2007 Firmware Tool Released

Mac Pro 2006-2007 Firmware Tool Released

forum.netkas.org

And it would be a good idea once you did , to install a pair of X5365s ( 2 x Quad 3.0 GHz ) .

Intel Xeon X5365 3 GHz Quad-Core (BX80563X5365A) Processor for sale online | eBay

Find many great new & used options and get the best deals for Intel Xeon X5365 3 GHz Quad-Core (BX80563X5365A) Processor at the best online prices at eBay! Free shipping for many products!

www.ebay.com

And buy an EFI ATI 5770 graphics card - there's a picture of one earlier in this thread .

ATI Radeon HD 5770 1GB PCIe X16 Video Card for Mac - SKU#1224858 | eBay

SKU: 1224858. Once you sign for the item, you are signing acceptance of the product as is. Good luck and have fun!

www.ebay.com

And buy some extra memory . You can install a 64 GB ( 8 x 8GB ) 667 MHz DDR2 FB kit in your Mac .

8GB = Samsung M395T1K66AZ4-CE66

Samsung PC2-5300 8 GB FB-DIMM 667 MHz DDR2 Memory (M395T1K66AZ4-CE66) for sale online | eBay

Find many great new & used options and get the best deals for Samsung PC2-5300 8 GB FB-DIMM 667 MHz DDR2 Memory (M395T1K66AZ4-CE66) at the best online prices at eBay! Free shipping for many products!

www.ebay.com

And a 2.5" SATA SSD , with a 2.5" to 3.5" adapter .

The Yosemite installer info is found here :

2006/2007 Mac Pro (1,1/2,1) and OS X Yosemite

This first post is usually updated with recent summarized information. Simply looking to download the Piker-Alpha macosxbootloader? Links: Piker-Alpha bootloader boot.efi with either black or light grey background Apple boot screen (build 3b402a9) Hennesie2000's Guide for installing Yosemite...

forums.macrumors.com