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GeForce GTX 285 1GB vs Radeon HD 4890 1GB


Intro

The GeForce GTX 285 1GB features core speeds of 648 MHz on the GPU, and 1242 MHz on the 1024 MB of GDDR3 memory. It features 240 SPUs along with 80 TAUs and 32 ROPs.

Compare those specs to the Radeon HD 4890 1GB, which comes with GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 Texture Address Units, 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

The GeForce GTX 285 1GB should in theory perform a lot faster than the Radeon HD 4890 1GB overall. (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 will be quite a bit (approximately 30%) more effective 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 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

Display Prices

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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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 can be processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

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.

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