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GeForce GTX 275 vs Radeon HD 7870 XT

Intro

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

Compare those specs to the Radeon HD 7870 XT, which has GPU core speed of 925 MHz, and 2048 MB of GDDR5 memory running at 1500 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

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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

As far as performance goes, the Radeon HD 7870 XT should in theory be a lot better than the GeForce GTX 275 in general. (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 (approximately 75%) more effective at texture 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

If running with a high resolution is important to you, then the Radeon HD 7870 XT is the winner, and very much so. (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: Memory bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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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.

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