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GeForce GTX 275 vs Radeon HD 7870 XT

Intro

The GeForce GTX 275 has a core clock speed of 633 MHz and a GDDR3 memory speed of 1134 MHz. It also uses a 448-bit bus, and uses a 55 nm design. It is made up of 240 SPUs, 80 TAUs, and 28 Raster Operation Units.

Compare that to the Radeon HD 7870 XT, which features core speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
GeForce GTX 275 219 Watts
Difference: 34 Watts (18%)

Memory Bandwidth

Performance-wise, the Radeon HD 7870 XT should in theory be a lot superior to the GeForce GTX 275 overall. (explain)

Radeon HD 7870 XT 192000 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 64992 (51%)

Texel Rate

The Radeon HD 7870 XT is a lot (about 75%) better at anisotropic filtering than the GeForce GTX 275. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
GeForce GTX 275 50640 Mtexels/sec
Difference: 38160 (75%)

Pixel Rate

The Radeon HD 7870 XT should be quite a bit (more or less 67%) faster with regards to full screen anti-aliasing than the GeForce GTX 275, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 11876 (67%)

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 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 275 Radeon HD 7870 XT
Manufacturer nVidia AMD
Year April 9, 2009 November 2012
Code Name G200b Tahiti LE
Memory 896 MB 2048 MB
Core Speed 633 MHz 925 MHz
Memory Speed 2268 MHz 6000 MHz
Power (Max TDP) 219 watts 185 watts
Bandwidth 127008 MB/sec 192000 MB/sec
Texel Rate 50640 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 240 1536
Texture Mapping Units 80 96
Render Output Units 28 32
Bus Type GDDR3 GDDR5
Bus Width 448-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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface within 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 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 275

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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