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GeForce GTX 275 vs Radeon HD 4870 2GB

Intro

The GeForce GTX 275 has core clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs as well as 80 TAUs and 28 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4870 2GB, which comes with a GPU core clock speed of 750 MHz, and 2048 MB of GDDR5 RAM running at 900 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
GeForce GTX 275 219 Watts
Difference: 69 Watts (46%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 275 should theoretically be a small bit superior to the Radeon HD 4870 2GB overall. (explain)

GeForce GTX 275 127008 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 11808 (10%)

Texel Rate

The GeForce GTX 275 will be a lot (approximately 69%) faster with regards to AF than the Radeon HD 4870 2GB. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 20640 (69%)

Pixel Rate

If using a high resolution 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 2GB 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 2GB

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 2GB
Manufacturer nVidia AMD
Year April 9, 2009 Jun 25, 2008
Code Name G200b RV770 XT
Memory 896 MB 2048 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 max amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units 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 in a second.

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

Display Prices

Hide Prices

GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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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