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GeForce GTX 275 vs Radeon HD 5850

Intro

The GeForce GTX 275 comes with a clock speed of 633 MHz and a GDDR3 memory speed of 1134 MHz. It also features a 448-bit bus, and makes use of a 55 nm design. It features 240 SPUs, 80 TAUs, and 28 Raster Operation Units.

Compare those specifications to the Radeon HD 5850, which comes with GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also features 1440(288x5) Stream Processors, 72 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5850 151 Watts
GeForce GTX 275 219 Watts
Difference: 68 Watts (45%)

Memory Bandwidth

In theory, the Radeon HD 5850 should be a bit faster than the GeForce GTX 275 in general. (explain)

Radeon HD 5850 128000 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 992 (1%)

Texel Rate

The Radeon HD 5850 should be a bit (more or less 3%) better at anisotropic filtering than the GeForce GTX 275. (explain)

Radeon HD 5850 52200 Mtexels/sec
GeForce GTX 275 50640 Mtexels/sec
Difference: 1560 (3%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5850 is superior to the GeForce GTX 275, by a large margin. (explain)

Radeon HD 5850 23200 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 5476 (31%)

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 5850

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 5850
Manufacturer nVidia AMD
Year April 9, 2009 September 30, 2009
Code Name G200b Cypress PRO
Memory 896 MB 1024 MB
Core Speed 633 MHz 725 MHz
Memory Speed 2268 MHz 4000 MHz
Power (Max TDP) 219 watts 151 watts
Bandwidth 127008 MB/sec 128000 MB/sec
Texel Rate 50640 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 23200 Mpixels/sec
Unified Shaders 240 1440(288x5)
Texture Mapping Units 80 72
Render Output Units 28 32
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 1400 million 2154 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 3.2

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 are processed in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure 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 outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 5850

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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