Radeon RX 6600
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AMD Radeon RX 6600 Graphics Cards
The Radeon RX 6600, introduced on October 13, 2021, is a gaming graphics card with a good price-performance ratio. The entry-level gaming graphics card for Full HD 1080p gaming is based on the RDNA2 GPU architecture (Navi II), and the graphics chip is manufactured in a 7-nm process at TSMC in Taiwan. Among various gaming technologies, the biggest innovation is hardware-accelerated ray tracing.
Performance data of the Radeon RX 6600 graphics card (reference design):
- Compute performance (FP32): approx. 8.93 TFLOPS
- GPU base clock: 1,626 MHz
- GPU game clock: 2,044 MHz
- GPU boost clock: 2,491 MHz
- Graphics memory: 8 GB GDDR6
- Memory clock: 7,000 MHz (effective 14,000 MHz)
- Memory interface: 128-bit
- Memory bandwidth: 224 GB/s
- Shader units: 1,792
- TDP of 132 watts
- Power supply: 1x 8-pin PCIe
- Video outputs: DP 1.4, HDMI 2.1
Radeon RX 6600: The RDNA2 GPU Architecture
The Radeon RX 6600 is based on the Navi 23 XL graphics chip, which consists of 11.1 billion transistors. The total of 1,792 stream processors (shader units) are grouped in groups of 64 shaders into 28 compute units (CUs, compute units). In addition to the 64 shaders, each CU is assigned a "Ray Accelerator" for hardware-based ray tracing.The GPU clocks at an average game clock of up to 2,044 MHz. With particularly high demands on the graphics chip, it can clock up to 2,491 MHz using the boost function. According to AMD, the RDNA2 compute units are supposed to clock up to 30 percent higher at the same power loss compared to the predecessor. In terms of energy efficiency, Big Navi is said to deliver about 65% more performance per watt than the first-generation Navi. The AMD Infinity Cache is also said to play a role in this.
Infinity Cache & Video Memory
One of the new features of the RDNA2 architecture is AMD's Infinity Cache. The AMD Infinity Cache enables an effective memory bandwidth that is 3.25 times higher. With a normal 128-bit memory interface and an effective memory clock of 14,000 MHz, the memory bandwidth is 224 GB/s. The Infinity Cache of the AMD Radeon RX 6600 achieves a bandwidth of 920 GB/s.
As video memory (VRAM), AMD uses the GDDR6 standard with a capacity of 8 GB for the Navi II graphics cards. Thanks to the mentioned Infinity Cache, this achieves a performance that should correspond to the faster GDDR6X in the end. This allows AMD to implement a powerful combination of high speed and high capacity on the graphics card without having to resort to the more expensive memory type.
Smart Access Memory
With Smart Access Memory (SAM) technology, AMD promises additional performance when combining a Radeon RX 6600 graphics card with a Ryzen 5000 processor on a motherboard with a B550 or X570 chipset. SAM takes advantage of the PCIe standard's resizable BAR function. A corresponding gaming system is supposed to benefit from a minimal performance increase. How much the performance gain is depends on the game and the chosen resolution.
Other Features
Among the many smaller optimizations of the RDNA2 GPU architecture are:
- HDMI 2.1 for 4K monitors with 120 Hertz
- Variable Rate Shading (DirectX 12 Ultimate)
- Mesh Shader (DirectX 12 Ultimate)
- Sampler Feedback (DirectX 12 Ultimate)
- AV1 decoding (8K30, 4K60)
- H264 & H.256 decoding/encoding
Ray Tracing & FidelityFX
With the Ray Accelerators, AMD has hardware-based ray tracing. Ray tracing (Microsoft DirectX 12 DXR) enables realistic lighting by simulating physical properties and the behavior of light. Ray tracing calculates the color of individual pixels along the path the light takes from the user's eye through a 3D landscape.
As light travels through the 3D scenery, it is reflected by objects or generates reflections. At the same time, shadows, transparent or semi-transparent objects are created. This results in refractions or distortions. All these effects are combined by ray tracing to display the final color of a pixel on the monitor.
As a relatively new technology, ray tracing places very high demands on the hardware. With FidelityFX, AMD implements a super-resolution technology to relieve the ray tracing accelerators.
Gaming Technologies
Together with the hardware in the form of graphics cards, AMD introduces new gaming technologies to provide PC gamers with a better experience. Supported features for gamers include:
- Performance presets in the Radeon Adrenalin 2020 software
- AMD Radeon Anti-Lag
- AMD Radeon Boost
- AMD FreeSync (4K@240Hz, 8K@60Hz)
- Supports HDMI 2.1 VRR
An Overview of the Current AMD RX 6000 Graphics Cards:
Do you want to know which AMD graphics card is right for you? The following list contains all current models of the RDNA-2 generation, sorted by performance, starting with the most powerful graphics card.