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GeForce GTX 285 1GB vs Radeon HD 7870 XT

Intro

The GeForce GTX 285 1GB uses a 55 nm design. nVidia has clocked the core frequency at 648 MHz. The GDDR3 memory works at a frequency of 1242 MHz on this particular model. It features 240 SPUs along with 80 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon HD 7870 XT, which features clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
GeForce GTX 285 1GB 204 Watts
Difference: 19 Watts (10%)

Memory Bandwidth

The Radeon HD 7870 XT, in theory, should be a lot faster than the GeForce GTX 285 1GB overall. (explain)

Radeon HD 7870 XT 192000 MB/sec
GeForce GTX 285 1GB 158976 MB/sec
Difference: 33024 (21%)

Texel Rate

The Radeon HD 7870 XT will be quite a bit (more or less 71%) more effective at texture filtering than the GeForce GTX 285 1GB. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
GeForce GTX 285 1GB 51840 Mtexels/sec
Difference: 36960 (71%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 XT is the winner, by far. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
GeForce GTX 285 1GB 20736 Mpixels/sec
Difference: 8864 (43%)

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

Check prices at:

Radeon HD 7870 XT

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 285 1GB Radeon HD 7870 XT
Manufacturer nVidia AMD
Year January 15, 2009 November 2012
Code Name G200b Tahiti LE
Memory 1024 MB 2048 MB
Core Speed 648 MHz 925 MHz
Memory Speed 2484 MHz 6000 MHz
Power (Max TDP) 204 watts 185 watts
Bandwidth 158976 MB/sec 192000 MB/sec
Texel Rate 51840 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 240 1536
Texture Mapping Units 80 96
Render Output Units 32 32
Bus Type GDDR3 GDDR5
Bus Width 512-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 1400 million 4313 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated 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 output rate also depends on many other factors, most notably the memory bandwidth of the card - 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

Check prices at:

Radeon HD 7870 XT

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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