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GeForce GTX 275 vs Radeon HD 7850

Intro

The GeForce GTX 275 makes use of a 55 nm design. nVidia has set the core speed at 633 MHz. The GDDR3 RAM works at a frequency of 1134 MHz on this particular model. It features 240 SPUs as well as 80 TAUs and 28 ROPs.

Compare all of that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has set the core frequency at 860 MHz. The GDDR5 memory is set to run at a speed of 1200 MHz on this particular card. It features 1024 SPUs as well as 64 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
GeForce GTX 275 219 Watts
Difference: 89 Watts (68%)

Memory Bandwidth

Performance-wise, the Radeon HD 7850 should theoretically be much better than the GeForce GTX 275 in general. (explain)

Radeon HD 7850 153600 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 26592 (21%)

Texel Rate

The Radeon HD 7850 is a bit (approximately 9%) faster with regards to texture filtering than the GeForce GTX 275. (explain)

Radeon HD 7850 55040 Mtexels/sec
GeForce GTX 275 50640 Mtexels/sec
Difference: 4400 (9%)

Pixel Rate

The Radeon HD 7850 will be much (approximately 55%) better at FSAA than the GeForce GTX 275, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7850 27520 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 9796 (55%)

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

Radeon HD 7850

Amazon.com

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 7850
Manufacturer nVidia AMD
Year April 9, 2009 March 2012
Code Name G200b Pitcairn Pro
Memory 896 MB 2048 MB
Core Speed 633 MHz 860 MHz
Memory Speed 2268 MHz 4800 MHz
Power (Max TDP) 219 watts 130 watts
Bandwidth 127008 MB/sec 153600 MB/sec
Texel Rate 50640 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 240 1024
Texture Mapping Units 80 64
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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total texture units of the card by the core 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 applied in one second.

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

Display Prices

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GeForce GTX 275

Amazon.com

Radeon HD 7850

Amazon.com

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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