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GeForce GTX 275 vs Radeon HD 7850

Intro

The GeForce GTX 275 has a GPU core speed of 633 MHz, and the 896 MB of GDDR3 RAM runs at 1134 MHz through a 448-bit bus. It also is made up of 240 SPUs, 80 Texture Address Units, and 28 Raster Operation Units.

Compare those specifications to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core speed at 860 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this specific card. It features 1024 SPUs as well as 64 TAUs and 32 ROPs.

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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

Theoretically speaking, the Radeon HD 7850 will be 21% faster than the GeForce GTX 275 in general, because of its greater bandwidth. (explain)

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

Texel Rate

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

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

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7850 is superior to the GeForce GTX 275, by far. (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 largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 are processed per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

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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