GPU Comparison
Side-by-side comparison of specifications and performance
Performance Comparison
AMD Radeon RX 6600 XT
200%
200%
AMD Radeon HD 7990
50%
50%
AMD Radeon RX 6600 XT is approximately 150% faster
Technical Specifications
| Specification | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| Graphics ProcessorDifferent | Navi 23 | Malta x2 |
| CoresDifferent | 2048 | 2048 x2 |
| TMUsDifferent | 128 | 128 x2 |
| ROPsDifferent | 64 | 32 x2 |
| Memory SizeDifferent | 8 GB | 3 GB x2 |
| Memory TypeDifferent | GDDR6 | GDDR5 |
| Bus WidthDifferent | 128 bit | 384 bit x2 |
Graphics Processor
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| GPU NameDifferent | Navi 23 | Malta |
| GPU VariantDifferent | Navi 23 XT(215-130000006) | Malta XT(215-0849026) |
| ArchitectureDifferent | RDNA 2.0 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Process SizeDifferent | 7 nm | 28 nm |
| TransistorsDifferent | 11,060 million | 4,313 million |
| DensityDifferent | 46.7M / mm² | 11.8M / mm² |
| Die SizeDifferent | 237 mm² | 365 mm² |
| Chip PackageDifferent | BGA-1269 | N/A |
Graphics Card
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| Release DateDifferent | Jul 30th, 2021 | Apr 24th, 2013 |
| AvailabilityDifferent | Aug 10th, 2021 | 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 | 379 USD | 999 USD |
| Current PriceDifferent | Amazon/Newegg | N/A |
| Bus InterfaceDifferent | PCIe 4.0 x8 | PCIe 3.0 x16 |
| ReviewsDifferent | 45 in our database | 37 in our database |
Clock Speeds
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| Base ClockDifferent | 1968 MHz | 950 MHz |
| Game ClockDifferent | 2359 MHz | N/A |
| Boost ClockDifferent | 2589 MHz | 1000 MHz |
| Memory ClockDifferent | 2000 MHz16 Gbps effective | 1500 MHz6 Gbps effective |
Memory
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| Memory SizeDifferent | 8 GB | 3 GB |
| Memory TypeDifferent | GDDR6 | GDDR5 |
| Memory BusDifferent | 128 bit | 384 bit |
| BandwidthDifferent | 256.0 GB/s | 288.0 GB/s |
Render Config
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| Shading Units | 2048 | 2048 |
| TMUs | 128 | 128 |
| ROPsDifferent | 64 | 32 |
| Compute Units | 32 | 32 |
| RT CoresDifferent | 32 | N/A |
| L0 CacheDifferent | 32 KB per WGP | N/A |
| L1 CacheDifferent | 128 KB per Array | 16 KB (per CU) |
| L2 CacheDifferent | 2 MB | 768 KB |
| L3 CacheDifferent | 32 MB | N/A |
Theoretical Performance
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| Pixel RateDifferent | 165.7 GPixel/s | 32.00 GPixel/s |
| Texture RateDifferent | 331.4 GTexel/s | 128.0 GTexel/s |
| FP16 (half)Different | 21.21 TFLOPS (2:1) | N/A |
| FP32 (float)Different | 10.60 TFLOPS | 4.096 TFLOPS |
| FP64 (double)Different | 662.8 GFLOPS (1:16) | 1,024.0 GFLOPS (1:4) |
Board Design
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| Slot Width | Dual-slot | Dual-slot |
| LengthDifferent | 190 mm7.5 inches | 304 mm12 inches |
| HeightDifferent | 110 mm4.3 inches | 106 mm4.2 inches |
| WidthDifferent | 40 mm1.6 inches | 38 mm1.5 inches |
| TDPDifferent | 160 W | 375 W |
| Suggested PSUDifferent | 450 W | 750 W |
| OutputsDifferent | 1x HDMI 2.13x DisplayPort 1.4a | 1x DVI4x mini-DisplayPort 1.2 |
| Power ConnectorsDifferent | 1x 8-pin | 2x 8-pin |
| Board NumberDifferent | D532 | 109-C47637-00A_02 |
Graphics Features
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 7990 |
|---|---|---|
| DirectXDifferent | 12 Ultimate (12_2) | 12 (11_1) |
| OpenGL | 4.6 | 4.6 |
| OpenCLDifferent | 2.1 | 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
55
Detailed Features
More Comparisons with AMD Radeon RX 6600 XT
Compare AMD Radeon RX 6600 XT with other GPUs of similar performance
AMD Radeon RX 6600 XT vs GeForce RTX 2080 SUPER
GeForce RTX 2080 SUPER Performance120%
GeForce RTX 2080 SUPER is 20% faster than AMD Radeon RX 6600 XT
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AMD Radeon RX 6600 XT vs Radeon RX 7600 XT
Radeon RX 7600 XT Performance119%
Radeon RX 7600 XT is 19% faster than AMD Radeon RX 6600 XT
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AMD Radeon RX 6600 XT vs GeForce RTX 4060
GeForce RTX 4060 Performance119%
GeForce RTX 4060 is 19% faster than AMD Radeon RX 6600 XT
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AMD Radeon RX 6600 XT vs Arc B580
Arc B580 Performance119%
Arc B580 is 19% faster than AMD Radeon RX 6600 XT
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AMD Radeon RX 6600 XT vs GeForce RTX 5050
GeForce RTX 5050 Performance115%
GeForce RTX 5050 is 15% faster than AMD Radeon RX 6600 XT
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AMD Radeon RX 6600 XT vs GeForce RTX 2080
GeForce RTX 2080 Performance115%
GeForce RTX 2080 is 15% faster than AMD Radeon RX 6600 XT
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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
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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
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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
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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
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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
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