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GeForce GTX 275 vs Radeon HD 4870 512MB

Intro

The GeForce GTX 275 comes with clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 memory. It features 240 SPUs along with 80 Texture Address Units and 28 Rasterization Operator Units.

Compare that to the Radeon HD 4870 512MB, which has core speeds of 750 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 512MB 150 Watts
GeForce GTX 275 219 Watts
Difference: 69 Watts (46%)

Memory Bandwidth

The GeForce GTX 275 should in theory be a bit faster than the Radeon HD 4870 512MB overall. (explain)

GeForce GTX 275 127008 MB/sec
Radeon HD 4870 512MB 115200 MB/sec
Difference: 11808 (10%)

Texel Rate

The GeForce GTX 275 should be much (about 69%) more effective at anisotropic filtering than the Radeon HD 4870 512MB. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 20640 (69%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 275 is the winner, by a large margin. (explain)

GeForce GTX 275 17724 Mpixels/sec
Radeon HD 4870 512MB 12000 Mpixels/sec
Difference: 5724 (48%)

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 275

Amazon.com

Check prices at:

Radeon HD 4870 512MB

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 275 Radeon HD 4870 512MB
Manufacturer nVidia AMD
Year April 9, 2009 Jun 25, 2008
Code Name G200b RV770 XT
Memory 896 MB 512 MB
Core Speed 633 MHz 750 MHz
Memory Speed 2268 MHz 3600 MHz
Power (Max TDP) 219 watts 150 watts
Bandwidth 127008 MB/sec 115200 MB/sec
Texel Rate 50640 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 240 800(160x5)
Texture Mapping Units 80 40
Render Output Units 28 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 1400 million 956 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 maximum amount of data (measured in MB per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, 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 chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4870 512MB

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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