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GeForce GTX 285 1GB vs Radeon HD 4890 1GB

Intro

The GeForce GTX 285 1GB comes with core clock speeds of 648 MHz on the GPU, and 1242 MHz on the 1024 MB of GDDR3 memory. It features 240 SPUs as well as 80 Texture Address Units and 32 ROPs.

Compare all that to the Radeon HD 4890 1GB, which comes with a clock frequency of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB 190 Watts
GeForce GTX 285 1GB 204 Watts
Difference: 14 Watts (7%)

Memory Bandwidth

In theory, the GeForce GTX 285 1GB is 27% quicker than the Radeon HD 4890 1GB overall, because of its greater data rate. (explain)

GeForce GTX 285 1GB 158976 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 34176 (27%)

Texel Rate

The GeForce GTX 285 1GB should be a lot (more or less 30%) better at AF than the Radeon HD 4890 1GB. (explain)

GeForce GTX 285 1GB 51840 Mtexels/sec
Radeon HD 4890 1GB 40000 Mtexels/sec
Difference: 11840 (30%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 285 1GB is a better choice, by far. (explain)

GeForce GTX 285 1GB 20736 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 4736 (30%)

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 285 1GB

Amazon.com

Radeon HD 4890 1GB

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 285 1GB Radeon HD 4890 1GB
Manufacturer nVidia AMD
Year January 15, 2009 Apr 2, 2009
Code Name G200b RV790 XT
Memory 1024 MB 1024 MB
Core Speed 648 MHz 1000 MHz
Memory Speed 2484 MHz 3900 MHz
Power (Max TDP) 204 watts 190 watts
Bandwidth 158976 MB/sec 124800 MB/sec
Texel Rate 51840 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 20736 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 55 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 maximum amount of information (in units of MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock 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 fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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