GPU Comparison
Side-by-side comparison of specifications and performance
Performance Comparison
AMD Radeon RX 6400
80%
80%
AMD Radeon HD 7990
125%
125%
AMD Radeon HD 7990 is approximately 45% faster
Technical Specifications
| Specification | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| Graphics ProcessorDifferent | Navi 24 | Malta x2 |
| CoresDifferent | 768 | 2048 x2 |
| TMUsDifferent | 48 | 128 x2 |
| ROPsDifferent | 32 | 32 x2 |
| Memory SizeDifferent | 4 GB | 3 GB x2 |
| Memory TypeDifferent | GDDR6 | GDDR5 |
| Bus WidthDifferent | 64 bit | 384 bit x2 |
Graphics Processor
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| GPU NameDifferent | Navi 24 | Malta |
| GPU VariantDifferent | Navi 24 XL(215-135000046) | Malta XT(215-0849026) |
| ArchitectureDifferent | RDNA 2.0 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Process SizeDifferent | 6 nm | 28 nm |
| TransistorsDifferent | 5,400 million | 4,313 million |
| DensityDifferent | 50.5M / mm² | 11.8M / mm² |
| Die SizeDifferent | 107 mm² | 365 mm² |
Graphics Card
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| Release DateDifferent | Jan 19th, 2022 | Apr 24th, 2013 |
| AvailabilityDifferent | Apr 20th, 2022 | N/A |
| GenerationDifferent | Navi II(RX 6000) | Southern Islands(HD 7900) |
| PredecessorDifferent | Navi | Northern Islands |
| SuccessorDifferent | Navi III | Sea Islands |
| ProductionDifferent | Active | End-of-life |
| Launch PriceDifferent | 159 USD | 999 USD |
| Bus InterfaceDifferent | PCIe 4.0 x4 | PCIe 3.0 x16 |
| ReviewsDifferent | N/A | 37 in our database |
Clock Speeds
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| Base ClockDifferent | 1923 MHz | 950 MHz |
| Game ClockDifferent | 2039 MHz | N/A |
| Boost ClockDifferent | 2321 MHz | 1000 MHz |
| Memory ClockDifferent | 2000 MHz16 Gbps effective | 1500 MHz6 Gbps effective |
Memory
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| Memory SizeDifferent | 4 GB | 3 GB |
| Memory TypeDifferent | GDDR6 | GDDR5 |
| Memory BusDifferent | 64 bit | 384 bit |
| BandwidthDifferent | 128.0 GB/s | 288.0 GB/s |
Render Config
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| Shading UnitsDifferent | 768 | 2048 |
| TMUsDifferent | 48 | 128 |
| ROPs | 32 | 32 |
| Compute UnitsDifferent | 12 | 32 |
| RT CoresDifferent | 12 | N/A |
| L0 CacheDifferent | 32 KB per WGP | N/A |
| L1 CacheDifferent | 128 KB per Array | 16 KB (per CU) |
| L2 CacheDifferent | 1024 KB | 768 KB |
| L3 CacheDifferent | 16 MB | N/A |
Theoretical Performance
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| Pixel RateDifferent | 74.27 GPixel/s | 32.00 GPixel/s |
| Texture RateDifferent | 111.4 GTexel/s | 128.0 GTexel/s |
| FP16 (half)Different | 7.130 TFLOPS (2:1) | N/A |
| FP32 (float)Different | 3.565 TFLOPS | 4.096 TFLOPS |
| FP64 (double)Different | 222.8 GFLOPS (1:16) | 1,024.0 GFLOPS (1:4) |
Board Design
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| Slot WidthDifferent | Single-slot | Dual-slot |
| TDPDifferent | 53 W | 375 W |
| Suggested PSUDifferent | 250 W | 750 W |
| OutputsDifferent | 1x HDMI 2.11x DisplayPort 1.4a | 1x DVI4x mini-DisplayPort 1.2 |
| Power ConnectorsDifferent | None | 2x 8-pin |
| Board NumberDifferent | D634 | 109-C47637-00A_02 |
| LengthDifferent | N/A | 304 mm12 inches |
| HeightDifferent | N/A | 106 mm4.2 inches |
| WidthDifferent | N/A | 38 mm1.5 inches |
Graphics Features
| Feature | AMD Radeon RX 6400 | AMD Radeon HD 7990 |
|---|---|---|
| DirectXDifferent | 12 Ultimate (12_2) | 12 (11_1) |
| OpenGL | 4.6 | 4.6 |
| OpenCLDifferent | 2.2 | 2.1 (1.2) |
| VulkanDifferent | 1.3 | 1.2.175 |
| Shader ModelDifferent | 6.8 | 6.5 (5.1) |
Comparison Summary
7
Specifications Compared
8
Feature Categories
53
Detailed Features
More Comparisons with AMD Radeon RX 6400
Compare AMD Radeon RX 6400 with other GPUs of similar performance
AMD Radeon RX 6400 vs GeForce GTX 970
GeForce GTX 970 Performance119%
GeForce GTX 970 is 19% faster than AMD Radeon RX 6400
Compare Detailed Specs
AMD Radeon RX 6400 vs Radeon R9 290X
Radeon R9 290X Performance119%
Radeon R9 290X is 19% faster than AMD Radeon RX 6400
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AMD Radeon RX 6400 vs Radeon R9 390
Radeon R9 390 Performance117%
Radeon R9 390 is 17% faster than AMD Radeon RX 6400
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AMD Radeon RX 6400 vs Radeon RX 570
Radeon RX 570 Performance116%
Radeon RX 570 is 16% faster than AMD Radeon RX 6400
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AMD Radeon RX 6400 vs Radeon R9 290
Radeon R9 290 Performance110%
Radeon R9 290 is 10% faster than AMD Radeon RX 6400
Compare Detailed Specs
AMD Radeon RX 6400 vs Radeon RX 470
Radeon RX 470 Performance108%
Radeon RX 470 is 8% faster than AMD Radeon RX 6400
Compare Detailed Specs
More Comparisons with AMD Radeon HD 7990
Compare AMD Radeon HD 7990 with other GPUs of similar performance
AMD Radeon HD 7990 vs Radeon RX 590
Radeon RX 590 Performance115%
Radeon RX 590 is 15% faster than AMD Radeon HD 7990
Compare Detailed Specs
AMD Radeon HD 7990 vs Radeon R9 FURY
Radeon R9 FURY Performance112%
Radeon R9 FURY is 12% faster than AMD Radeon HD 7990
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AMD Radeon HD 7990 vs GeForce GTX 980
GeForce GTX 980 Performance111%
GeForce GTX 980 is 11% faster than AMD Radeon HD 7990
Compare Detailed Specs
AMD Radeon HD 7990 vs GeForce GTX 1650 SUPER
GeForce GTX 1650 SUPER Performance110%
GeForce GTX 1650 SUPER is 10% faster than AMD Radeon HD 7990
Compare Detailed Specs
AMD Radeon HD 7990 vs Radeon RX 6500 XT
Radeon RX 6500 XT Performance109%
Radeon RX 6500 XT is 9% faster than AMD Radeon HD 7990
Compare Detailed Specs
AMD Radeon HD 7990 vs Radeon RX 5500 XT
Radeon RX 5500 XT Performance108%
Radeon RX 5500 XT is 8% faster than AMD Radeon HD 7990
Compare Detailed Specs