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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

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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)

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This article applies only to video cards that originally shipped with a specified Mac Pro or were offered as an upgrade kit by Apple. Similar cards that were not provided by Apple may have compatibility issues and you should work with the vendor of that card to confirm compatibility.

Mac Pro (2019)

Learn more about cards you can install in Mac Pro (2019) and how to install PCIe cards in your Mac Pro (2019).

Mac Pro (Late 2013)

• Dual AMD FirePro D300
• Dual AMD FirePro D500
• Dual AMD FirePro D700

Mac Pro (Mid 2010) and Mac Pro (Mid 2012)

• ATI Radeon HD 5770
• ATI Radeon HD 5870
  Learn about graphics cards supported in macOS 10.14 Mojave on Mac Pro (2010) and Mac Pro (Mid 2012).

Mac Pro (Early 2009)

• NVIDIA GeForce GT 120
• ATI Radeon HD 4870
  
• ATI Radeon HD 5870, offered as an upgrade kit
  The Radeon HD 5870 card requires Mac OS X 10.6.4 or later and the use of both auxiliary power connections.

Mac Pro (Early 2008)

• ATI Radeon HD 2600 XT
• NVIDIA GeForce 8800 GT (part number 630-9191 or 630-9897)*
• NVIDIA Quadro FX 5600
• ATI Radeon HD 4870, offered as an upgrade kit
  The Radeon HD 4870 card requires Mac OS X 10.5.7 or later.

Mac Pro (Original)

• NVIDIA GeForce 7300 GT
• ATI Radeon X1900 XT
• NVIDIA Quadro FX 4500 (part number 630-7532 or 630-7895)*
• NVIDIA GeForce 8800 GT (part number 630-9492), offered as an upgrade kit.*
  The NVIDIA GeForce 8800 GT card requires Mac OS X 10.5.2 or later with the Leopard Graphics Update 1.0 or the computer may not start up properly.

* To identify a graphics card part number, check the label on the back of the card.