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Question: Sapphire Radeon R9 280 OC 3GB DDR5

Hello,


As the title says, I have a R9 280 from Sapphire, but the OS X shows something different with a huge amount of VRAM.


This is the specs:

Model Name: Mac Pro

Model Identifier: MacPro4,1

Processor Name: Quad-Core Intel Xeon

Processor Speed: 2.93 GHz

Number of Processors: 2

Total Number of Cores: 8

L2 Cache (per Core): 256 KB

L3 Cache (per Processor): 8 MB

Memory: 64 GB

Processor Interconnect Speed: 6.4 GT/s

Boot ROM Version: MP41.0081.B07

SMC Version (system): 1.39f5

SMC Version (processor tray): 1.39f5


AMD Radeon HD 7950:

Chipset Model: AMD Radeon HD 7950

Type: GPU

Bus: PCIe

Slot: Slot-1

PCIe Lane Width: x16

VRAM (Total): 914361344 MB

Vendor: ATI (0x1002)

Device ID: 0x679a

Revision ID: 0x0000

ROM Revision: 113-E2080C-101

EFI Driver Version: 01.00.624

Displays:

S23C550:

Resolution: 1920 x 1080 @ 60Hz (1080p)

Pixel Depth: 32-Bit Color (ARGB8888)

Main Display: Yes

Mirror: Off

Online: Yes

Rotation: Supported

Television: Yes

SMT24A550:

Resolution: 1920 x 1080 @ 60Hz (1080p)

Pixel Depth: 32-Bit Color (ARGB8888)

Mirror: Off

Online: Yes

Rotation: Supported

Television: Yes


I tried both original BIOS for the card and the patched one from netkas. I can see, for example the boot screen and play some games like Bioshock, but this weird value for VRAM concerns me.


Also, after some hours playing a game, the screen freezes and the system restarts. It happens despite of the BIOS version (EFI or regular one). According to the sensors, CPU/GPU temperature looks okay.


With this in mind, I want to ask:


- Anyone here is having similar issues?

- Is there anything that I can do?


Thanks!

Mac Pro, OS X El Capitan (10.11)

Posted on Oct 14, 2015 9:22 PM

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Question marked as Solved
Answer:
Answer:

Aaaand... I fixed the issue.


After calling the Sapphire's support center for weeks, they realize that my video card was missing some BIOS updates.

I patched it, extracted again, did the procedure to create an EFI BIOS and it worked like a charm.


Now I can see the correct amount of memory even when not using the EFI BIOS.

Posted on Oct 30, 2015 10:04 PM

Oct 15, 2015 2:21 AM in response to maiams13 In response to maiams13

I have seen information that suggests a Radeon HD 7950 = an R9 280 and a Radeon HD 7970 = an R9 280x. Your results seem to confirm that. I have no idea why two different model numbers would be used for apparently the same card(s).


Do you have a link to a picture of the card? I ask because some versions of the card would match the original 'reference' design and that would be the design for which Apple's drivers are written and for which the pre-built Mac 7950 firmware is intended. There are two approaches to flashing a PC version of this card, one is to use a firmware image someone else built for a standard i.e. reference HD 7950 (or presumably R9 280) or to use the additional tools to build one specifically for your card by 'appending' the Mac EFI code to the standard non-EFI PC firmware.


Note: If you don't have a 'reference' design card this may mean at a minimum one or more connectors do not work on the card however reports seem to indicate that otherwise the card will work. For example reference designs only have a single DVI connection and many non-reference designs have two.

Oct 15, 2015 2:21 AM

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Oct 15, 2015 6:14 AM in response to maiams13 In response to maiams13

maiams13 wrote:


Hello,


This is my card: http://www.sapphiretech.com/productdetial.asp?pid=C4D1B443-6105-4A63-85DE-1732CC 9C443D&lang=eng


I must say that it works fine using Bootcamp.


Thanks for the link. As you obviously know and I can now see it has two DVI ports so does not count as a 'reference' design. As a comparison the following is a standard i.e. reference HD 7950 - http://www.sapphiretech.com/productdetial.asp?pid=D9A64D5D-60F4-41C4-BF78-8773BA 2C3974&lang=eng


The following is also a HD 7950 but looks more like yours but does have the same 'reference' mix of connectors i.e. only one DVI. http://www.sapphiretech.com/productdetial.asp?pid=083028EE-FE92-40C7-91D0-C88569 F5B115&lang=eng


Did you build your own firmware or just use someone else's?


Normally according to reports I have seen the only consequence of a non-reference design is that the second DVI ports just does not work but everything else does. I have not seen reports of VRAM errors like yours but did you also do the hardware mod to 'fix' the PCIe speed in a Mac? See http://forums.macrumors.com/threads/how-to-make-link-speed-2-5gt-s-to-5-0gt-s-on -ati-card-and-nvidia-card.1547340/


You can look under PCI in System Profiler to see if the Mac is recognising your card as 5GT/s or 2.5GT/s

Oct 15, 2015 6:14 AM

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Oct 15, 2015 6:25 AM in response to John Lockwood In response to John Lockwood

I tried both making my own and using the original BIOS from Sapphire's support. This card offers a dual-BIOS and I tried both.


This is the thread at netkas.org on where I am discussing the same issue: http://netkas.org/forum/index.php/topic,5619.435.html

They think that I am using a wrong BIOS but I really don't believe that. I got mine from Sapphire's support only to make sure that I was using the correct one.

I haven't change anything in the card itself. No resistor changes, nothing but only a custom BIOS.

Oct 15, 2015 6:25 AM

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Question marked as Solved

Oct 30, 2015 10:04 PM in response to maiams13 In response to maiams13

Aaaand... I fixed the issue.


After calling the Sapphire's support center for weeks, they realize that my video card was missing some BIOS updates.

I patched it, extracted again, did the procedure to create an EFI BIOS and it worked like a charm.


Now I can see the correct amount of memory even when not using the EFI BIOS.

Oct 30, 2015 10:04 PM

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Question: Sapphire Radeon R9 280 OC 3GB DDR5