Radeon RX 6600S vs R9 390
Aggregated performance score
RX 6600S outperforms R9 390 by 53% based on our aggregated benchmark results.
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in performance ranking | 224 | 136 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 12.47 | no data |
| Architecture | GCN 2.0 (2013−2017) | RDNA 2 (2020−2022) |
| GPU code name | Grenada | Navi 23 |
| Market segment | Desktop | Laptop |
| Design | reference | no data |
| Release date | 18 June 2015 (8 years ago) | 4 January 2022 (2 years ago) |
| Launch price (MSRP) | $329 | no data |
| Current price | $20 (0.1x MSRP) | no data |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
Detailed specifications
General performance parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. These parameters indirectly speak of performance, but for precise assessment you have to consider their benchmark and gaming test results. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 2560 | 1792 |
| Boost clock speed | 1000 MHz | 1881 MHz |
| Number of transistors | 6,200 million | 11,060 million |
| Manufacturing process technology | 28 nm | 7 nm |
| Power consumption (TDP) | 275 Watt | 80 Watt |
| Texture fill rate | 160.0 | 224.0 |
| Floating-point performance | 5,120 gflops | no data |
Form factor & compatibility
Information on Radeon R9 390 and Radeon RX 6600S compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop video cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility). For notebook video cards it's notebook size, connection slot and bus, if the video card is inserted into a slot instead of being soldered to the notebook motherboard.
| Laptop size | no data | medium sized |
| Bus support | PCIe 3.0 | no data |
| Interface | PCIe 3.0 x16 | PCIe 4.0 x8 |
| Length | 275 mm | no data |
| Width | 2-slot | no data |
| Supplementary power connectors | 1 x 6-pin, 1 x 8-pin | None |
| Bridgeless CrossFire | 1 | no data |
VRAM capacity and type
Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.
| Memory type | GDDR5 | GDDR6 |
| High bandwidth memory (HBM) | - | no data |
| Maximum RAM amount | 0 MB | 4 GB |
| Memory bus width | 512 Bit | 128 Bit |
| Memory clock speed | 1000 MHz | 16000 MHz |
| Memory bandwidth | 384 GB/s | 224.0 GB/s |
| Shared memory | no data | - |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | 2x DVI, 1x HDMI, 1x DisplayPort | No outputs |
| Eyefinity | 1 | no data |
| Number of Eyefinity displays | 6 | no data |
| HDMI | + | no data |
| DisplayPort support | + | no data |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| AppAcceleration | - | no data |
| CrossFire | 1 | no data |
| Enduro | - | no data |
| FreeSync | 1 | no data |
| HD3D | - | no data |
| PowerTune | + | no data |
| TrueAudio | + | no data |
| ZeroCore | - | no data |
| VCE | + | no data |
| DDMA audio | + | no data |
API compatibility
List of supported graphics and general-purpose computing APIs, including their specific versions.
| DirectX | DirectX® 12 | 12.0 Ultimate (12_2) |
| Shader Model | 6.3 | 6.5 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 2.1 |
| Vulkan | + | 1.2 |
| Mantle | + | no data |
Synthetic benchmark performance
Non-gaming benchmark performance comparison. The combined score is measured on a 0-100 point scale.
Combined synthetic benchmark score
This is our combined benchmark performance score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
RX 6600S outperforms R9 390 by 53% based on our aggregated benchmark results.
Passmark
This is the most ubiquitous GPU benchmark, part of Passmark PerformanceTest suite. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.
Benchmark coverage: 25%
RX 6600S outperforms R9 390 by 53% in Passmark.
Gaming performance
Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.
Pros & cons summary
| Performance score | 23.07 | 35.35 |
| Recency | 18 June 2015 | 4 January 2022 |
| Chip lithography | 28 nm | 7 nm |
| Power consumption (TDP) | 275 Watt | 80 Watt |
The Radeon RX 6600S is our recommended choice as it beats the Radeon R9 390 in performance tests.
Be aware that Radeon R9 390 is a desktop card while Radeon RX 6600S is a notebook one.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
