Home GPU Comparison AMD Radeon RX 6900 XTX vs NVIDIA GeForce GTX 660 Rev. 2

AMD Radeon RX 6900 XTX vs NVIDIA GeForce GTX 660 Rev. 2

We compared two Desktop platform GPUs: 16GB VRAM Radeon RX 6900 XTX 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

AMD Radeon RX 6900 XTX 's Advantages
Boost Clock has increased by 136% (2435MHz vs 1032MHz)
More VRAM (16GB vs 2GB)
Larger VRAM bandwidth (576.0GB/s vs 144.2GB/s)
4160 additional rendering cores
NVIDIA GeForce GTX 660 Rev. 2 's Advantages
Lower TDP (140W vs 330W)

Score

Benchmark

FP32 (float)
Radeon RX 6900 XTX +1158%
24.93 TFLOPS
GeForce GTX 660 Rev. 2
1.981 TFLOPS
VS

Graphics Card

Unknown
Release Date
Sep 2014
Navi II
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 4.0 x16
Bus Interface
PCIe 3.0 x16

Clock Speeds

2075 MHz
Base Clock
980 MHz
2435 MHz
Boost Clock
1032 MHz
2250 MHz
Memory Clock
1502 MHz

Memory

16GB
Memory Size
2GB
GDDR6
Memory Type
GDDR5
256bit
Memory Bus
192bit
576.0GB/s
Bandwidth
144.2GB/s

Render Config

80
Compute Units
-
-
-
-
5120
Shading Units
960
320
TMUs
80
128
ROPs
24
-
-
-
80
RT Cores
-
128 KB per Array
L1 Cache
16 KB (per SMX)
4 MB
L2 Cache
384 KB
128 MB
L3 Cache
-

Theoretical Performance

311.7 GPixel/s
Pixel Rate
20.64 GPixel/s
779.2 GTexel/s
Texture Rate
82.56 GTexel/s
49.87 TFLOPS
FP16 (half)
-
24.93 TFLOPS
FP32 (float)
1.981 TFLOPS
1.558 TFLOPS
FP64 (double)
82.56 GFLOPS

Board Design

330W
TDP
140W
700 W
Suggested PSU
300 W
1x HDMI 2.1 2x DisplayPort 1.4a 1x USB Type-C
Outputs
2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2
2x 8-pin
Power Connectors
1x 6-pin

Graphics Processor

Navi 21
GPU Name
GK104
Navi 21 XTXH (215-121000247)
GPU Variant
-
RDNA 2.0
Architecture
Kepler
TSMC
Foundry
TSMC
7 nm
Process Size
28 nm
26.8 billion
Transistors
3.54 billion
520 mm²
Die Size
294 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
6.5
Shader Model
5.1

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