GPU Comparison
Side-by-side comparison of specifications and performance
Performance Comparison
AMD Radeon RX 6600 XT
291%
291%
AMD Radeon HD 6990
34%
34%
AMD Radeon RX 6600 XT is approximately 257% faster
Technical Specifications
| Specification | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| Graphics ProcessorDifferent | Navi 23 | Antilles x2 |
| CoresDifferent | 2048 | 1536 x2 |
| TMUsDifferent | 128 | 96 x2 |
| ROPsDifferent | 64 | 32 x2 |
| Memory SizeDifferent | 8 GB | 2 GB x2 |
| Memory TypeDifferent | GDDR6 | GDDR5 |
| Bus WidthDifferent | 128 bit | 256 bit x2 |
Graphics Processor
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| GPU NameDifferent | Navi 23 | Antilles |
| GPU VariantDifferent | Navi 23 XT(215-130000006) | Antilles XT(215-0807027) |
| ArchitectureDifferent | RDNA 2.0 | TeraScale 3 |
| Foundry | TSMC | TSMC |
| Process SizeDifferent | 7 nm | 40 nm |
| TransistorsDifferent | 11,060 million | 2,640 million |
| DensityDifferent | 46.7M / mm² | 6.8M / mm² |
| Die SizeDifferent | 237 mm² | 389 mm² |
| Chip PackageDifferent | BGA-1269 | N/A |
Graphics Card
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| Release DateDifferent | Jul 30th, 2021 | Mar 8th, 2011 |
| AvailabilityDifferent | Aug 10th, 2021 | N/A |
| GenerationDifferent | Navi II(RX 6000) | Northern Islands(HD 6900) |
| PredecessorDifferent | Navi | Evergreen |
| SuccessorDifferent | Navi III | Southern Islands |
| ProductionDifferent | Active | End-of-life |
| Launch PriceDifferent | 379 USD | 699 USD |
| Current PriceDifferent | Amazon/Newegg | N/A |
| Bus InterfaceDifferent | PCIe 4.0 x8 | PCIe 2.0 x16 |
| ReviewsDifferent | 45 in our database | 47 in our database |
Clock Speeds
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| Base ClockDifferent | 1968 MHz | N/A |
| Game ClockDifferent | 2359 MHz | N/A |
| Boost ClockDifferent | 2589 MHz | N/A |
| Memory ClockDifferent | 2000 MHz16 Gbps effective | 1250 MHz5 Gbps effective |
| GPU ClockDifferent | N/A | 830 MHz |
Memory
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| Memory SizeDifferent | 8 GB | 2 GB |
| Memory TypeDifferent | GDDR6 | GDDR5 |
| Memory BusDifferent | 128 bit | 256 bit |
| BandwidthDifferent | 256.0 GB/s | 160.0 GB/s |
Render Config
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| Shading UnitsDifferent | 2048 | 1536 |
| TMUsDifferent | 128 | 96 |
| ROPsDifferent | 64 | 32 |
| Compute UnitsDifferent | 32 | 24 |
| RT CoresDifferent | 32 | N/A |
| L0 CacheDifferent | 32 KB per WGP | N/A |
| L1 CacheDifferent | 128 KB per Array | 8 KB (per CU) |
| L2 CacheDifferent | 2 MB | 512 KB |
| L3 CacheDifferent | 32 MB | N/A |
Theoretical Performance
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| Pixel RateDifferent | 165.7 GPixel/s | 26.56 GPixel/s |
| Texture RateDifferent | 331.4 GTexel/s | 79.68 GTexel/s |
| FP16 (half)Different | 21.21 TFLOPS (2:1) | N/A |
| FP32 (float)Different | 10.60 TFLOPS | 2.550 TFLOPS |
| FP64 (double)Different | 662.8 GFLOPS (1:16) | 637.4 GFLOPS (1:4) |
Board Design
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| Slot Width | Dual-slot | Dual-slot |
| LengthDifferent | 190 mm7.5 inches | 310 mm12.2 inches |
| HeightDifferent | 110 mm4.3 inches | 115 mm4.5 inches |
| Width | 40 mm1.6 inches | 40 mm1.6 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-C20647-00 |
Graphics Features
| Feature | AMD Radeon RX 6600 XT | AMD Radeon HD 6990 |
|---|---|---|
| DirectXDifferent | 12 Ultimate (12_2) | 11.2 (11_0) |
| OpenGLDifferent | 4.6 | 4.4 |
| OpenCLDifferent | 2.1 | 1.2 |
| VulkanDifferent | 1.3 | N/A |
| Shader ModelDifferent | 6.8 | 5.0 |
Comparison Summary
7
Specifications Compared
8
Feature Categories
56
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 6990
Compare AMD Radeon HD 6990 with other GPUs of similar performance
AMD Radeon HD 6990 vs GeForce GTX 1650
GeForce GTX 1650 Performance119%
GeForce GTX 1650 is 19% faster than AMD Radeon HD 6990
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AMD Radeon HD 6990 vs Radeon RX 6400
Radeon RX 6400 Performance117%
Radeon RX 6400 is 17% faster than AMD Radeon HD 6990
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AMD Radeon HD 6990 vs Arc A380
Arc A380 Performance115%
Arc A380 is 15% faster than AMD Radeon HD 6990
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AMD Radeon HD 6990 vs GeForce GTX 780
GeForce GTX 780 Performance115%
GeForce GTX 780 is 15% faster than AMD Radeon HD 6990
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AMD Radeon HD 6990 vs Radeon HD 7970 GHz Edition
Radeon HD 7970 GHz Edition Performance104%
Radeon HD 7970 GHz Edition is 4% faster than AMD Radeon HD 6990
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AMD Radeon HD 6990 vs GeForce GTX 590
GeForce GTX 590 Performance104%
GeForce GTX 590 is 4% faster than AMD Radeon HD 6990
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