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GeForce GTX 280 vs Radeon HD 5770

Intro

The GeForce GTX 280 comes with a GPU core clock speed of 602 MHz, and the 1024 MB of GDDR3 memory is set to run at 1107 MHz through a 512-bit bus. It also is comprised of 240 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 5770, which has GPU core speed of 850 MHz, and 1024 MB of GDDR5 RAM set to run at 1200 MHz through a 128-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
GeForce GTX 280 236 Watts
Difference: 128 Watts (119%)

Memory Bandwidth

Theoretically, the GeForce GTX 280 should be much faster than the Radeon HD 5770 overall. (explain)

GeForce GTX 280 141696 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 64896 (85%)

Texel Rate

The GeForce GTX 280 will be much (about 42%) better at AF than the Radeon HD 5770. (explain)

GeForce GTX 280 48160 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 14160 (42%)

Pixel Rate

The GeForce GTX 280 should be a lot (more or less 42%) better at anti-aliasing than the Radeon HD 5770, and capable of handling higher resolutions better. (explain)

GeForce GTX 280 19264 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 5664 (42%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce GTX 280

Amazon.com

Radeon HD 5770

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTX 280 Radeon HD 5770
Manufacturer nVidia AMD
Year June 17, 2008 October 13, 2009
Code Name G200 Juniper XT
Memory 1024 MB 1024 MB
Core Speed 602 MHz 850 MHz
Memory Speed 2214 MHz 4800 MHz
Power (Max TDP) 236 watts 108 watts
Bandwidth 141696 MB/sec 76800 MB/sec
Texel Rate 48160 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 19264 Mpixels/sec 13600 Mpixels/sec
Unified Shaders 240 800(160x5)
Texture Mapping Units 80 40
Render Output Units 32 16
Bus Type GDDR3 GDDR5
Bus Width 512-bit 128-bit
Fab Process 65 nm 40 nm
Transistors 1400 million 1040 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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