Report an Error

AMD Radeon Sky 900

Tahiti x2
Graphics Processor
1792 x2
Cores
112 x2
TMUs
32 x2
ROPs
3 GB x2
Memory Size
GDDR5
Memory Type
384 bit x2
Bus Width
AMD Radeon Sky 900 Photo AMD Tahiti Photo
The Radeon Sky 900 was a professional graphics card by AMD, launched in March 2013. Built on the 28 nm process, and based on the Tahiti graphics processor, in its Orthrus variant, the card supports DirectX 12.0. The Tahiti graphics processor is a large chip with a die area of 352 mm² and 4,313 million transistors. Unlike the fully unlocked Radeon HD 7970, which uses the same GPU but has all 2048 shaders enabled, AMD has disabled some shading units on the Radeon Sky 900 to reach the product's target shader count. Radeon Sky 900 combines two graphics processors to increase performance. It features 1792 shading units, 112 texture mapping units and 32 ROPs per GPU. AMD has placed 6,144 MB GDDR5 memory on the card, which are connected using a 384-bit memory interface per GPU (each GPU manages 3,072 MB). The GPU is operating at a frequency of 825 MHz, which can be boosted up to 950 MHz, memory is running at 1250 MHz.
Being a dual-slot card, the AMD Radeon Sky 900 draws power from 2x 8-pin power connectors, with power draw rated at 300 W maximum. Display outputs include: 1x DVI, 1x mini-DisplayPort. Radeon Sky 900 is connected to the rest of the system using a PCI-Express 3.0 x16 interface. The card measures 305 mm in length, and features a dual-slot cooling solution.

Graphics Processor

GPU Name
Tahiti
GPU Variant
Orthrus
Architecture
GCN 1.0
Foundry
TSMC
Process Size
28 nm
Transistors
4,313 million
Die Size
352 mm²

Graphics Card

Release Date
Mar 27th, 2013
Generation
Radeon Sky
(x00)
Production
End-of-life
Bus Interface
PCIe 3.0 x16

Relative Performance

3%
3%
4%
5%
6%
6%
8%
10%
11%
11%
12%
12%
14%
15%
16%
17%
17%
18%
19%
20%
21%
21%
22%
25%
25%
26%
26%
26%
26%
27%
28%
30%
30%
31%
31%
32%
32%
32%
32%
33%
34%
35%
38%
38%
38%
40%
40%
41%
44%
46%
46%
47%
47%
49%
49%
49%
50%
53%
54%
55%
55%
55%
55%
59%
60%
61%
62%
62%
63%
63%
64%
64%
66%
71%
73%
75%
75%
76%
77%
78%
81%
82%
84%
86%
86%
95%
100%
Radeon Sky 900
104%
106%
113%
113%
115%
117%
118%
118%
120%
120%
121%
122%
128%
131%
133%
133%
146%
149%
151%
162%
178%
185%
199%
199%
210%
234%
246%
252%
275%
312%
Based on TPU review data: "Performance Summary" at 1920x1080
Performance estimated based on architecture, shader count and clocks.

Clock Speeds

GPU Clock
825 MHz
Boost Clock
950 MHz
Memory Clock
1250 MHz
5000 MHz effective

Memory

Memory Size
3 GB
Memory Type
GDDR5
Memory Bus
384 bit
Bandwidth
240.0 GB/s

Render Config

Shading Units
1792
TMUs
112
ROPs
32
Compute Units
28

Theoretical Performance

Pixel Rate
30.40 GPixel/s
Texture Rate
106.4 GTexel/s
FP32 (float) performance
3,405 GFLOPS
FP64 (double) performance
851.2 GFLOPS (1:4)

Board Design

Slot Width
Dual-slot
Length
12 inches
305 mm
TDP
300 W
Outputs
1x DVI
1x mini-DisplayPort
Power Connectors
2x 8-pin
Board Number
C476

Graphics Features

DirectX
12.0 (11_1)
OpenGL
4.5
OpenCL
1.2
Vulkan
1.1.77
Shader Model
5.1

Tahiti GPU Notes

Graphics/Compute: GFX6 (gfx600)
Display Core Engine: 6.0
Unified Video Decoder: 3.2
Video Compression Engine: 1.0

Exact Transistor Count: 4,312,711,873