Radeon HD 6990 vs GeForce GTX 660 Rev. 2
We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 2GB VRAM GeForce GTX 660 Rev. 2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
Radeon HD 6990 's Advantages
Larger VRAM bandwidth (160.0GB/s vs 144.2GB/s)
576 additional rendering cores
GeForce GTX 660 Rev. 2 's Advantages
Released 3 years and 6 months late
Boost Clock1032MHz
Lower TDP (140W vs 375W)
Score
Benchmark
FP32 (float)
Radeon HD 6990
+28%
2550
GeForce GTX 660 Rev. 2
1981
Graphics Card
Mar 2011
Release Date
Sep 2014
Northern Islands
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 2.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
Base Clock
980 MHz
-
Boost Clock
1032 MHz
1250 MHz
Memory Clock
1502 MHz
Memory
2GB
Memory Size
2GB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
192bit
160.0GB/s
Bandwidth
144.2GB/s
Render Config
24
Compute Units
-
1536
Shading Units
960
96
TMUs
80
32
ROPs
24
8 KB (per CU)
L1 Cache
16 KB (per SMX)
512 KB
L2 Cache
384 KB
Theoretical Performance
26.56 GPixel/s
Pixel Rate
20.64 GPixel/s
79.68 GTexel/s
Texture Rate
82.56 GTexel/s
2.550 TFLOPS
FP32 (float)
1.981 TFLOPS
637.4 GFLOPS
FP64 (double)
82.56 GFLOPS
Board Design
375W
TDP
140W
750 W
Suggested PSU
300 W
1x DVI
4x mini-DisplayPort 1.2
Outputs
2x DVI
1x HDMI 1.4a
1x DisplayPort 1.2
2x 8-pin
Power Connectors
1x 6-pin
Graphics Processor
Antilles
GPU Name
GK104
Antilles XT
(215-0807027)
GPU Variant
-
TeraScale 3
Architecture
Kepler
TSMC
Foundry
TSMC
40 nm
Process Size
28 nm
2.64 billion
Transistors
3.54 billion
389 mm²
Die Size
294 mm²
Graphics Features
11.2 (11_0)
DirectX
12 (11_0)
4.4
OpenGL
4.6
1.2
OpenCL
3.0
N/A
Vulkan
1.1
-
CUDA
3.0
5.0
Shader Model
5.1