NVIDIA Tesla K20X vs AMD Radeon HD 6850 X2
GPU · Specs Compare
Graphics Card
Release Date
Nov 2012
Sep 2011
Generation
Tesla
Northern Islands
Type
Professional
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 2.0 x16
Clock Speeds
Memory Clock
1300 MHz
1050 MHz
Memory
Memory Size
6GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
384bit
256bit
Bandwidth
249.6GB/s
134.4GB/s
Render Config
Shading Units
2688
960
TMUs
224
48
ROPs
48
32
L1 Cache
16 KB (per SMX)
8 KB (per CU)
L2 Cache
1536 KB
512 KB
Compute Units
—
12
Theoretical Performance
Pixel Rate
40.99 GPixel/s
25.60 GPixel/s
Texture Rate
164.0 GTexel/s
38.40 GTexel/s
FP32 (float)
3.935 TFLOPS
1.536 TFLOPS
FP64 (double)
1312 GFLOPS
—
Graphics Processor
GPU Name
GK110
Barts
Architecture
Kepler
TeraScale 2
Foundry
TSMC
TSMC
Process Size
28 nm
40 nm
Transistors
7.08 billion
1.7 billion
Die Size
561 mm²
255 mm²
GPU Variant
—
Barts PRO(215-0798006)
Board Design
TDP
235W
254W
Suggested PSU
550 W
600 W
Outputs
No outputs
2x DVI1x HDMI 1.3a1x DisplayPort 1.1
Power Connectors
1x 6-pin + 1x 8-pin
2x 8-pin
Graphics Features
DirectX
12 (11_0)
11.2 (11_0)
OpenGL
4.6
4.4
OpenCL
3.0
1.2
Vulkan
1.1
N/A
CUDA
3.5
—
Shader Model
5.1
5.0
▲ Specs Compare
Data sourced from official specifications and benchmark tests.