GPU Comparison
Side-by-side comparison of specifications and performance
Performance Comparison
NVIDIA GeForce GTX 660
75%
75%
AMD Radeon HD 6990
150%
150%
AMD Radeon HD 6990 is approximately 75% faster
Technical Specifications
| Specification | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| Graphics ProcessorDifferent | GK106 | Antilles x2 |
| CoresDifferent | 960 | 1536 x2 |
| TMUsDifferent | 80 | 96 x2 |
| ROPsDifferent | 24 | 32 x2 |
| Memory SizeDifferent | 2 GB | 2 GB x2 |
| Memory Type | GDDR5 | GDDR5 |
| Bus WidthDifferent | 192 bit | 256 bit x2 |
Graphics Processor
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| GPU NameDifferent | GK106 | Antilles |
| GPU VariantDifferent | GK106-400-A1 | Antilles XT(215-0807027) |
| ArchitectureDifferent | Kepler | TeraScale 3 |
| Foundry | TSMC | TSMC |
| Process SizeDifferent | 28 nm | 40 nm |
| TransistorsDifferent | 2,540 million | 2,640 million |
| DensityDifferent | 11.5M / mm² | 6.8M / mm² |
| Die SizeDifferent | 221 mm² | 389 mm² |
| Chip PackageDifferent | BGA-1425 | N/A |
Graphics Card
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| Release DateDifferent | Sep 6th, 2012 | Mar 8th, 2011 |
| GenerationDifferent | GeForce 600 | Northern Islands(HD 6900) |
| PredecessorDifferent | GeForce 500 | Evergreen |
| SuccessorDifferent | GeForce 700 | Southern Islands |
| Production | End-of-life | End-of-life |
| Launch PriceDifferent | 229 USD | 699 USD |
| Bus InterfaceDifferent | PCIe 3.0 x16 | PCIe 2.0 x16 |
| ReviewsDifferent | 77 in our database | 47 in our database |
Clock Speeds
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| Base ClockDifferent | 980 MHz | N/A |
| Boost ClockDifferent | 1032 MHz | N/A |
| Memory ClockDifferent | 1502 MHz6 Gbps effective | 1250 MHz5 Gbps effective |
| GPU ClockDifferent | N/A | 830 MHz |
Memory
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| Memory Size | 2 GB | 2 GB |
| Memory Type | GDDR5 | GDDR5 |
| Memory BusDifferent | 192 bit | 256 bit |
| BandwidthDifferent | 144.2 GB/s | 160.0 GB/s |
Render Config
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| Shading UnitsDifferent | 960 | 1536 |
| TMUsDifferent | 80 | 96 |
| ROPsDifferent | 24 | 32 |
| SMX CountDifferent | 5 | N/A |
| L1 CacheDifferent | 16 KB (per SMX) | 8 KB (per CU) |
| L2 CacheDifferent | 384 KB | 512 KB |
| Compute UnitsDifferent | N/A | 24 |
Theoretical Performance
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| Pixel RateDifferent | 20.64 GPixel/s | 26.56 GPixel/s |
| Texture RateDifferent | 82.56 GTexel/s | 79.68 GTexel/s |
| FP32 (float)Different | 1.981 TFLOPS | 2.550 TFLOPS |
| FP64 (double)Different | 82.56 GFLOPS (1:24) | 637.4 GFLOPS (1:4) |
Board Design
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| Slot Width | Dual-slot | Dual-slot |
| LengthDifferent | 241 mm9.5 inches | 310 mm12.2 inches |
| TDPDifferent | 140 W | 375 W |
| Suggested PSUDifferent | 300 W | 750 W |
| OutputsDifferent | 2x DVI1x HDMI 1.4a1x DisplayPort 1.2 | 1x DVI4x mini-DisplayPort 1.2 |
| Power ConnectorsDifferent | 1x 6-pin | 2x 8-pin |
| Board NumberDifferent | P2030 SKU 0 | 109-C20647-00 |
| HeightDifferent | N/A | 115 mm4.5 inches |
| WidthDifferent | N/A | 40 mm1.6 inches |
Graphics Features
| Feature | NVIDIA GeForce GTX 660 | AMD Radeon HD 6990 |
|---|---|---|
| DirectXDifferent | 12 (11_0) | 11.2 (11_0) |
| OpenGLDifferent | 4.6 | 4.4 |
| OpenCLDifferent | 3.0 | 1.2 |
| VulkanDifferent | 1.2.175 | N/A |
| CUDADifferent | 3.0 | N/A |
| Shader ModelDifferent | 6.5 (5.1) | 5.0 |
Comparison Summary
7
Specifications Compared
8
Feature Categories
51
Detailed Features
More Comparisons with NVIDIA GeForce GTX 660
Compare NVIDIA GeForce GTX 660 with other GPUs of similar performance
NVIDIA GeForce GTX 660 vs Radeon HD 5970
Radeon HD 5970 Performance117%
Radeon HD 5970 is 17% faster than NVIDIA GeForce GTX 660
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NVIDIA GeForce GTX 660 vs GeForce GTX 1630
GeForce GTX 1630 Performance117%
GeForce GTX 1630 is 17% faster than NVIDIA GeForce GTX 660
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NVIDIA GeForce GTX 660 vs GeForce GTX 1050
GeForce GTX 1050 Performance115%
GeForce GTX 1050 is 15% faster than NVIDIA GeForce GTX 660
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NVIDIA GeForce GTX 660 vs GeForce GTX 760
GeForce GTX 760 Performance114%
GeForce GTX 760 is 14% faster than NVIDIA GeForce GTX 660
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NVIDIA GeForce GTX 660 vs GeForce GTX 580
GeForce GTX 580 Performance114%
GeForce GTX 580 is 14% faster than NVIDIA GeForce GTX 660
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NVIDIA GeForce GTX 660 vs GeForce GTX 660 Ti
GeForce GTX 660 Ti Performance113%
GeForce GTX 660 Ti is 13% faster than NVIDIA GeForce GTX 660
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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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