Radeon HD 4890 vs GeForce GTX 780M Mac |
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Differences What are the advantages of each
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| Higher clock speed | 1,000 MHz | vs | 771 MHz | Around 30% higher clock speed | |||
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| More memory | 4,096 MB | vs | 1,024 MB | 4x more memory | |||
| Higher effective memory clock speed | 5,000 MHz | vs | 4,000 MHz | 25% higher effective memory clock speed | |||
| Significantly more texture mapping units | 128 | vs | 40 | 88 more texture mapping units | |||
| Higher texture rate | 98.7 GTexel/s | vs | 40 GTexel/s | Around 2.5x higher texture rate | |||
| Higher memory bandwidth | 160 GB/s | vs | 128 GB/s | 25% higher memory bandwidth | |||
| Slightly better floating-point performance | 2,368.5 GFLOPS | vs | 1,600 GFLOPS | Around 50% better floating-point performance | |||
| More render output processors | 32 | vs | 16 | Twice as many render output processors | |||
| More shading units | 1,536 | vs | 800 | 736 more shading units | |||
| Slightly higher pixel rate | 24.67 GPixel/s | vs | 16 GPixel/s | Around 55% higher pixel rate | |||
| Higher memory clock speed | 1,250 MHz | vs | 1,000 MHz | 25% higher memory clock speed | |||
| Lower TDP | 122W | vs | 190W | More than 35% lower TDP | |||
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Features Key features of the Radeon HD 4890 vs GeForce GTX 780M Mac
memory bandwidth Rate at which data can be read from or stored in onboard memory
pixel rate Number of pixels a graphics card can render to the screen every second
texture rate Speed at which a graphics card can perform texture mapping
floating point performance How fast the gpu can crunch numbers
shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading
texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes
Specifications Full list of technical specs
gpu | Radeon HD 4890 | vs | GeForce GTX 780M Mac |
|---|---|---|---|
| GPU brand | ATI | Nvidia | |
| GPU name | RV790 | GK104 | |
| Market | Desktop | Laptop | |
| Clock speed | 1,000 MHz | 771 MHz | |
| Is dual GPU | No | No | |
| Reference card | ATi Radeon HD 4890 850 MHz 1 GB | None | |
raw performance | |||
| Shading units | 800 | 1,536 | |
| Texture mapping units | 40 | 128 | |
| Render output processors | 16 | 32 | |
| Pixel rate | 16 GPixel/s | 24.67 GPixel/s | |
| Texture rate | 40 GTexel/s | 98.7 GTexel/s | |
| Floating-point performance | 1,600 GFLOPS | 2,368.5 GFLOPS | |
memory | Radeon HD 4890 | vs | GeForce GTX 780M Mac |
|---|---|---|---|
| Memory clock speed | 1,000 MHz | 1,250 MHz | |
| Effective memory clock speed | 4,000 MHz | 5,000 MHz | |
| Memory bus | 256 bit | 256 bit | |
| Memory | 1,024 MB | 4,096 MB | |
| Memory type | GDDR5 | GDDR5 | |
| Memory bandwidth | 128 GB/s | 160 GB/s | |
noise and power | |||
| TDP | 190W | 122W | |
