Radeon HD 6990 and Radeon RX 6600 XT - video card comparison
Passmark - benchmark score Radeon HD 6990 vs Radeon RX 6600 XT
Radeon HD 6990
3103
Radeon RX 6600 XT
16985
Radeon HD 6990
Radeon RX 6600 XT
Architecture
TeraScale 3 (2010−2013)
Navi / RDNA2 (2020−2022)
GPU code name
Antilles
Navi 23
Market segment
Desktop
Desktop
Release date
March 2011
July 2021
Interface
PCIe 2.0 x16
PCIe 4.0 x8
Supplementary power connectors
2x 8-pin
1x 8-pin
Boost clock speed
-
2589 MHz
Core clock speed
830 MHz
1968 MHz
Floating-point performance
2x 2,549.8 gflops
-
Manufacturing process technology
40 nm
7 nm
Number of transistors
2,640 million
11,060 million
Pipelines / CUDA cores
1536
2048
Power consumption (TDP)
375 Watt
160 (TGP) Watt
Texture fill rate
79.68
331.4
Memory type
GDDR5
GDDR6
Maximum RAM amount
2 GB
8 GB
Memory bus width
256 Bit
128 Bit
Memory clock speed
5000 MHz
16000 MHz
Memory bandwidth
160.0 GB/s
256.0 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 4x mini-DisplayPort
1x HDMI, 2x DisplayPort
HDMI
-
+
DirectX
11.2 (11_0)
12.0 Ultimate (12_2)
OpenCL
1.2
2.1
OpenGL
4.4
4.6
Shader Model
5.0
6.5
Vulkan
N/A
1.2