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GeForce GTX 275 vs Radeon HD 7870

Intro

The GeForce GTX 275 uses a 55 nm design. nVidia has set the core speed at 633 MHz. The GDDR3 RAM runs at a frequency of 1134 MHz on this specific card. It features 240 SPUs along with 80 Texture Address Units and 28 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7870, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this particular model. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
GeForce GTX 275 219 Watts
Difference: 44 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 will be 21% faster than the GeForce GTX 275 in general, due to its greater bandwidth. (explain)

Radeon HD 7870 153600 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 26592 (21%)

Texel Rate

The Radeon HD 7870 will be quite a bit (more or less 58%) better at AF than the GeForce GTX 275. (explain)

Radeon HD 7870 80000 Mtexels/sec
GeForce GTX 275 50640 Mtexels/sec
Difference: 29360 (58%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7870 is superior to the GeForce GTX 275, and very much so. (explain)

Radeon HD 7870 32000 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 14276 (81%)

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

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Radeon HD 7870

Amazon.com

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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 7870
Manufacturer nVidia AMD
Year April 9, 2009 March 2012
Code Name G200b Pitcairn XT
Memory 896 MB 2048 MB
Core Speed 633 MHz 1000 MHz
Memory Speed 2268 MHz 4800 MHz
Power (Max TDP) 219 watts 175 watts
Bandwidth 127008 MB/sec 153600 MB/sec
Texel Rate 50640 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 240 1280
Texture Mapping Units 80 80
Render Output Units 28 32
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 1400 million 2800 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 7870

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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