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AMD Radeon R9 255 OEM
- Graphics Processor
- Cape Verde
- Cores
- 512
- TMUs
- 32
- ROPs
- 16
- Memory Size
- 2 GB
- Memory Type
- GDDR5
- Bus Width
- 128 bit
GPU
The Radeon R9 255 OEM was a graphics card by AMD, launched on December 21st, 2013. Built on the 28 nm process, and based on the Cape Verde graphics processor, in its Cape Verde PRX variant, the card supports DirectX 12. Even though it supports DirectX 12, the feature level is only 11_1, which can be problematic with newer DirectX 12 titles. The Cape Verde graphics processor is an average sized chip with a die area of 123 mm² and 1,500 million transistors. Unlike the fully unlocked Radeon HD 7770 GHz Edition, which uses the same GPU but has all 640 shaders enabled, AMD has disabled some shading units on the Radeon R9 255 OEM to reach the product's target shader count. It features 512 shading units, 32 texture mapping units, and 16 ROPs. AMD has paired 2,048 MB GDDR5 memory with the Radeon R9 255 OEM, which are connected using a 128-bit memory interface. The GPU is operating at a frequency of 900 MHz, which can be boosted up to 930 MHz, memory is running at 1150 MHz (4.6 Gbps effective).
Being a dual-slot card, the AMD Radeon R9 255 OEM draws power from 1x 6-pin power connector, with power draw rated at 65 W maximum. This device has no display connectivity, as it is not designed to have monitors connected to it. Radeon R9 255 OEM is connected to the rest of the system using a PCI-Express 3.0 x16 interface.
Being a dual-slot card, the AMD Radeon R9 255 OEM draws power from 1x 6-pin power connector, with power draw rated at 65 W maximum. This device has no display connectivity, as it is not designed to have monitors connected to it. Radeon R9 255 OEM is connected to the rest of the system using a PCI-Express 3.0 x16 interface.
Graphics Processor
- GPU Name
- Cape Verde
- GPU Variant
- Cape Verde PRX
- Architecture
- GCN 1.0
- Foundry
- TSMC
- Process Size
- 28 nm
- Transistors
- 1,500 million
- Density
- 12.2M / mm²
- Die Size
- 123 mm²
- Chip Package
- FCBGA-962
Graphics Card
- Release Date
- Dec 21st, 2013
- Generation
-
Volcanic Islands
(R9 200)
- Predecessor
- Sea Islands
- Successor
- Pirate Islands
- Production
- End-of-life
- Bus Interface
- PCIe 3.0 x16
Relative Performance
Based on TPU review data: "Performance Summary" at 1920x1080, 4K for 2080 Ti and faster.
Performance estimated based on architecture, shader count and clocks.
Clock Speeds
- Base Clock
- 900 MHz
- Boost Clock
- 930 MHz
- Memory Clock
-
1150 MHz
4.6 Gbps effective
Memory
- Memory Size
- 2 GB
- Memory Type
- GDDR5
- Memory Bus
- 128 bit
- Bandwidth
- 73.60 GB/s
Render Config
- Shading Units
- 512
- TMUs
- 32
- ROPs
- 16
- Compute Units
- 8
- L1 Cache
- 16 KB (per CU)
- L2 Cache
- 256 KB
Theoretical Performance
- Pixel Rate
- 14.88 GPixel/s
- Texture Rate
- 29.76 GTexel/s
- FP32 (float)
- 952.3 GFLOPS
- FP64 (double)
- 59.52 GFLOPS (1:16)
Board Design
- Slot Width
- Dual-slot
- TDP
- 65 W
- Suggested PSU
- 250 W
- Outputs
- No outputs
- Power Connectors
- 1x 6-pin
- Board Number
- C750
Graphics Features
- DirectX
- 12 (11_1)
- OpenGL
- 4.6
- OpenCL
- 2.1 (1.2)
- Vulkan
- 1.2.170
- Shader Model
- 6.5 (5.1)
Cape Verde GPU Notes
| Generation: Southern Islands Mobile Variant: Chelsea / Heathrow / Venus / Tropo Graphics/Compute: GFX6 (gfx601) Display Core Engine: 6.0 Unified Video Decoder: 4.0 Video Compression Engine: 1.0 CLRX: GCN 1.0 |
Retail boards based on this design (1)
| Name | GPU Clock | Boost Clock | Memory Clock | Other Changes |
|---|---|---|---|---|
| 800 MHz | 900 MHz | 900 MHz | DDR3 |
Apr 28th, 2024 20:21 EDT
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