Radeon RX 6400 vs GeForce GTX 660 Rev. 2
We compared two Desktop platform GPUs: 4GB VRAM Radeon RX 6400 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 RX 6400 's Advantages
Released 7 years and 4 months late
Boost Clock has increased by 125% (2321MHz vs 1032MHz)
More VRAM (4GB vs 2GB)
Lower TDP (53W vs 140W)
GeForce GTX 660 Rev. 2 's Advantages
Larger VRAM bandwidth (144.2GB/s vs 128.0GB/s)
192 additional rendering cores
Score
Benchmark
FP32 (float)
Radeon RX 6400
+79%
3565
GeForce GTX 660 Rev. 2
1981
Graphics Card
Jan 2022
Release Date
Sep 2014
Navi II
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 4.0 x4
Bus Interface
PCIe 3.0 x16
Clock Speeds
1923 MHz
Base Clock
980 MHz
2321 MHz
Boost Clock
1032 MHz
2000 MHz
Memory Clock
1502 MHz
Memory
4GB
Memory Size
2GB
GDDR6
Memory Type
GDDR5
64bit
Memory Bus
192bit
128.0GB/s
Bandwidth
144.2GB/s
Render Config
12
Compute Units
-
768
Shading Units
960
48
TMUs
80
32
ROPs
24
12
RT Cores
-
128 KB per Array
L1 Cache
16 KB (per SMX)
1024 KB
L2 Cache
384 KB
16 MB
L3 Cache
-
Theoretical Performance
74.27 GPixel/s
Pixel Rate
20.64 GPixel/s
111.4 GTexel/s
Texture Rate
82.56 GTexel/s
7.130 TFLOPS
FP16 (half)
-
3.565 TFLOPS
FP32 (float)
1.981 TFLOPS
222.8 GFLOPS
FP64 (double)
82.56 GFLOPS
Board Design
53W
TDP
140W
250 W
Suggested PSU
300 W
1x HDMI 2.1
1x DisplayPort 1.4a
Outputs
2x DVI
1x HDMI 1.4a
1x DisplayPort 1.2
None
Power Connectors
1x 6-pin
Graphics Processor
Navi 24
GPU Name
GK104
Navi 24 XL
(215-135000046)
GPU Variant
-
RDNA 2.0
Architecture
Kepler
TSMC
Foundry
TSMC
6 nm
Process Size
28 nm
5.4 billion
Transistors
3.54 billion
107 mm²
Die Size
294 mm²
Graphics Features
12 Ultimate (12_2)
DirectX
12 (11_0)
4.6
OpenGL
4.6
2.2
OpenCL
3.0
1.3
Vulkan
1.1
-
CUDA
3.0
6.7
Shader Model
5.1
