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AMD Radeon R5 M255

Topaz
Graphics Processor
384
Cores
24
TMUs
8
ROPs
1024 MB
Memory Size
GDDR5
Memory Type
128 bit
Bus Width
AMD Topaz Photo
The Radeon R5 M255 was a graphics card by AMD, launched in October 2014. Built on the 28 nm process, and based on the Topaz graphics processor, in its Topaz PRO variant, the card supports DirectX 12.0. The Topaz graphics processor is an average sized chip with a die area of 125 mm² and 3,100 million transistors. It features 384 shading units, 24 texture mapping units and 8 ROPs. AMD has placed 1,024 MB GDDR5 memory on the card, which are connected using a 128-bit memory interface. The GPU is operating at a frequency of 925 MHz, which can be boosted up to 940 MHz, memory is running at 1000 MHz.
Its power draw is not exactly known. This device has no display connectivity, as it is not designed to have monitors connected to it. Radeon R5 M255 is connected to the rest of the system using a PCI-Express 3.0 x8 interface.

Graphics Processor

GPU Name
Topaz
GPU Variant
Topaz PRO
(216-0864032)
Architecture
GCN 3.0
Foundry
TSMC
Process Size
28 nm
Transistors
3,100 million
Die Size
125 mm²

Graphics Card

Release Date
Oct 12th, 2014
Generation
Crystal System
(R5 M200)
Production
End-of-life
Bus Interface
PCIe 3.0 x8

Relative Performance

16%
20%
25%
31%
37%
39%
48%
63%
64%
69%
73%
75%
86%
91%
98%
100%
Radeon R5 M255
101%
105%
108%
116%
122%
125%
128%
133%
152%
153%
156%
158%
158%
160%
161%
170%
179%
182%
189%
190%
192%
194%
195%
195%
199%
208%
212%
228%
232%
232%
242%
242%
251%
268%
276%
278%
283%
284%
294%
298%
300%
305%
319%
326%
331%
331%
332%
333%
360%
363%
371%
376%
378%
381%
382%
388%
389%
400%
431%
442%
453%
456%
460%
465%
476%
488%
500%
512%
519%
519%
575%
633%
642%
685%
688%
698%
707%
713%
716%
726%
730%
733%
739%
779%
795%
805%
805%
886%
901%
917%
985%
1082%
1120%
1207%
1207%
1273%
1421%
1489%
1528%
1665%
1894%
Based on TPU review data: "Performance Summary" at 1920x1080
Performance estimated based on architecture, shader count and clocks.

Clock Speeds

GPU Clock
925 MHz
Boost Clock
940 MHz
Memory Clock
1000 MHz
4000 MHz effective

Memory

Memory Size
1024 MB
Memory Type
GDDR5
Memory Bus
128 bit
Bandwidth
64.00 GB/s

Render Config

Shading Units
384
TMUs
24
ROPs
8
Compute Units
6

Theoretical Performance

Pixel Rate
7.520 GPixel/s
Texture Rate
22.56 GTexel/s
FP16 (half) performance
721.9 GFLOPS (1:1)
FP32 (float) performance
721.9 GFLOPS
FP64 (double) performance
45.12 GFLOPS (1:16)

Board Design

TDP
unknown
Outputs
No outputs

Graphics Features

DirectX
12.0 (12_0)
OpenGL
4.5
OpenCL
2.0
Vulkan
1.1.82
Shader Model
6.0

Topaz GPU Notes

Chip Variant: Iceland
Graphics/Compute: GFX8 (gfx802)
Display Core Engine: No Support
Unified Video Decoder: No Support
Video Compression Engine: No Support
ROCm Support