GPU Comparison
RADEON
AMD Radeon HD 6850 X2
CORE STATE
Barts
VRAM
2 GB
CLOCK SPEED
—
TDP
254 W
BUS WIDTH
256 bit
ARCHITECTURE
TeraScale 2
PROCESS
40 nm
LAUNCH DATE
2011
VS
GEFORCE
Tesla K40m
CORE STATE
GK110B
VRAM
12 GB
CLOCK SPEED
876 MHz
TDP
245 W
BUS WIDTH
384 bit
ARCHITECTURE
Kepler
PROCESS
28 nm
LAUNCH DATE
2013
PERFORMANCE BENCHMARKS
geekbench_opencl
DETAILED SPECIFICATIONS
SPECIFICATION
HD 6850 X2
Tesla K40m
Core Specs
Shading Units
960
2,880
+200.0%
Shaders
960
2,880
+200.0%
TMUs
48
240
+400.0%
ROPs
32
48
+50.0%
Compute Units
12
—
Clocks
Base Clock
—
745 MHz
Boost Clock
—
876 MHz
GPU Clock
800 MHz
—
Memory Clock
1050 MHz
4.2 Gbps effective
1502 MHz
6 Gbps effective
Memory
Memory Size
2 GB
12 GB
VRAM (MB)
2,048
12,288
+500.0%
Memory Type
GDDR5
GDDR5
Memory Bus
256 bit
384 bit
Bandwidth
134.4 GB/s
288.4 GB/s
Cache
L1 Cache
8 KB (per CU)
16 KB (per SMX)
L2 Cache
512 KB
1536 KB
Performance
Pixel Rate
25.60 GPixel/s
52.56 GPixel/s
Texture Rate
38.40 GTexel/s
210.2 GTexel/s
FP32 (TFLOPS)
1.536 TFLOPS
5.046 TFLOPS
FP64 (TFLOPS)
—
1.682 TFLOPS (1:3)
Power
TDP
254 W
245 W
TDP (W)
254
245
-3.5%
Suggested PSU
600 W
550 W
Power Connectors
2x 8-pin
—
Architecture
Architecture
TeraScale 2
Kepler
GPU Name
Barts
GK110B
Generation
Northern Islands
(HD 6800)
Tesla Kepler
(Kxx)
Process Size
40 nm
28 nm
Transistors
1,700 million
7,080 million
Die Size
255 mm²
561 mm²
Foundry
TSMC
TSMC
Density
6.7M / mm²
12.6M / mm²
API Support
DirectX
11.2 (11_0)
12 (11_1)
OpenGL
4.4
4.6
Vulkan
—
1.2.175
OpenCL
1.2
3.0
CUDA
—
3.5
Shader Model
5.0
6.5 (5.1)
Physical
Slot Width
Dual-slot
Dual-slot
Length
—
267 mm
10.5 inches
Outputs
2x DVI1x HDMI 1.3a1x DisplayPort 1.1
No outputs
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Other
Launch Price
—
7,699 USD
Production
End-of-life
End-of-life
Predecessor
Evergreen
Tesla Fermi
Successor
Southern Islands
Tesla Maxwell