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GeForce GTX 275 vs Radeon HD 4870 512MB

Intro

The GeForce GTX 275 has a core clock frequency of 633 MHz and a GDDR3 memory frequency of 1134 MHz. It also makes use of a 448-bit memory bus, and uses a 55 nm design. It features 240 SPUs, 80 Texture Address Units, and 28 ROPs.

Compare all that to the Radeon HD 4870 512MB, which has a clock frequency of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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 theoretically be a little bit faster than the Radeon HD 4870 512MB in general. (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 quite a bit (more or less 69%) better at texture 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 running with high levels of AA is important to you, then the GeForce GTX 275 is a better choice, 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: Bandwidth is the largest amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

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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