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GeForce GTX 280 vs Radeon HD 5770

Intro

The GeForce GTX 280 has a clock speed of 602 MHz and a GDDR3 memory frequency of 1107 MHz. It also makes use of a 512-bit memory bus, and makes use of a 65 nm design. It is comprised of 240 SPUs, 80 Texture Address Units, and 32 ROPs.

Compare that to the Radeon HD 5770, which has a core clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 128-bit bus, and makes use of 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

Theoretically speaking, the GeForce GTX 280 will be 85% quicker than the Radeon HD 5770 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The GeForce GTX 280 is a lot (more or less 42%) more effective 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 is much (about 42%) faster with regards to AA than the Radeon HD 5770, and also should be able to handle higher screen resolutions more effectively. (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 largest amount of information (counted in MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

GeForce GTX 280

Radeon HD 5770

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