Radeon RX 6600 XT vs GeForce GTX 660
We compared two Desktop platform GPUs: 8GB VRAM Radeon RX 6600 XT and 2GB VRAM GeForce GTX 660 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
Radeon RX 6600 XT 's Advantages
Released 8 years and 10 months late
Boost Clock has increased by 151% (2589MHz vs 1032MHz)
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (256.0GB/s vs 144.2GB/s)
1088 additional rendering cores
GeForce GTX 660 's Advantages
Lower TDP (140W vs 160W)
Score
Benchmark
FP32 (float)
Radeon RX 6600 XT
+435%
10600
GeForce GTX 660
1981
3DMark Time Spy
Radeon RX 6600 XT
+708%
9656
GeForce GTX 660
1194
3DMark Time Spy Extreme
Radeon RX 6600 XT
+1591%
4399
GeForce GTX 660
260
Blender
Radeon RX 6600 XT
+977%
1196
GeForce GTX 660
111
Graphics Card
Jul 2021
Release Date
Sep 2012
Navi II
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 4.0 x8
Bus Interface
PCIe 3.0 x16
Clock Speeds
1968 MHz
Base Clock
980 MHz
2589 MHz
Boost Clock
1032 MHz
2000 MHz
Memory Clock
1502 MHz
Memory
8GB
Memory Size
2GB
GDDR6
Memory Type
GDDR5
128bit
Memory Bus
192bit
256.0GB/s
Bandwidth
144.2GB/s
Render Config
32
Compute Units
-
2048
Shading Units
960
128
TMUs
80
64
ROPs
24
32
RT Cores
-
128 KB per Array
L1 Cache
16 KB (per SMX)
2 MB
L2 Cache
384 KB
32 MB
L3 Cache
-
Theoretical Performance
165.7 GPixel/s
Pixel Rate
20.64 GPixel/s
331.4 GTexel/s
Texture Rate
82.56 GTexel/s
21.21 TFLOPS
FP16 (half)
-
10.60 TFLOPS
FP32 (float)
1.981 TFLOPS
662.8 GFLOPS
FP64 (double)
82.56 GFLOPS
Board Design
160W
TDP
140W
450 W
Suggested PSU
300 W
1x HDMI 2.1
3x DisplayPort 1.4a
Outputs
2x DVI
1x HDMI 1.4a
1x DisplayPort 1.2
1x 8-pin
Power Connectors
1x 6-pin
Graphics Processor
Navi 23
GPU Name
GK106
Navi 23 XT
(215-130000006)
GPU Variant
GK106-400-A1
RDNA 2.0
Architecture
Kepler
TSMC
Foundry
TSMC
7 nm
Process Size
28 nm
11.06 billion
Transistors
2.54 billion
237 mm²
Die Size
221 mm²
Graphics Features
12 Ultimate (12_2)
DirectX
12 (11_0)
4.6
OpenGL
4.6
2.1
OpenCL
3.0
1.3
Vulkan
1.1
-
CUDA
3.0
6.7
Shader Model
5.1