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GeForce GTX 280 vs Radeon HD 4890 2GB

Intro

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

Compare those specs to the Radeon HD 4890 2GB, which has GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM set to run at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB 190 Watts
GeForce GTX 280 236 Watts
Difference: 46 Watts (24%)

Memory Bandwidth

Performance-wise, the GeForce GTX 280 should in theory be a small bit superior to the Radeon HD 4890 2GB overall. (explain)

GeForce GTX 280 141696 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 16896 (14%)

Texel Rate

The GeForce GTX 280 is a bit (approximately 20%) better at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX 280 48160 Mtexels/sec
Radeon HD 4890 2GB 40000 Mtexels/sec
Difference: 8160 (20%)

Pixel Rate

The GeForce GTX 280 is a small bit (more or less 20%) faster with regards to anti-aliasing than the Radeon HD 4890 2GB, and will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 280 19264 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 3264 (20%)

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

Check prices at:

Radeon HD 4890 2GB

Amazon.com

Check prices at:

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 4890 2GB
Manufacturer nVidia AMD
Year June 17, 2008 Apr 2, 2009
Code Name G200 RV790 XT
Memory 1024 MB 2048 MB
Core Speed 602 MHz 1000 MHz
Memory Speed 2214 MHz 3900 MHz
Power (Max TDP) 236 watts 190 watts
Bandwidth 141696 MB/sec 124800 MB/sec
Texel Rate 48160 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 19264 Mpixels/sec 16000 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 256-bit
Fab Process 65 nm 55 nm
Transistors 1400 million 959 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video 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 most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's 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 is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce GTX 280

Amazon.com

Check prices at:

Radeon HD 4890 2GB

Amazon.com

Check prices at:

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.

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