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GeForce GTX 280 vs Radeon HD 5770


Intro

The GeForce GTX 280 comes with core speeds of 602 MHz on the GPU, and 1107 MHz on the 1024 MB of GDDR3 RAM. It features 240 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon HD 5770, which comes with a core clock frequency of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 800(160x5) SPUs, 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

Performance-wise, the GeForce GTX 280 should theoretically be much superior to 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 is quite a bit (approximately 42%) better at texture filtering 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 much (about 42%) faster with regards to FSAA than the Radeon HD 5770, and will be capable of handling higher resolutions without slowing down too much. (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

GeForce GTX 280

Radeon HD 5770

Specifications

Display 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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units by the core 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

GeForce GTX 280

Radeon HD 5770

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