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GeForce GTX 275 vs Radeon HD 7870

Intro

The GeForce GTX 275 comes with clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs along with 80 TAUs and 28 Rasterization Operator Units.

Compare those specs to the Radeon HD 7870, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory works at a speed of 1200 MHz on this particular model. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
GeForce GTX 275 219 Watts
Difference: 44 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 is 21% faster than the GeForce GTX 275 overall, due to its higher bandwidth. (explain)

Radeon HD 7870 153600 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 26592 (21%)

Texel Rate

The Radeon HD 7870 will be much (approximately 58%) faster with regards to AF than the GeForce GTX 275. (explain)

Radeon HD 7870 80000 Mtexels/sec
GeForce GTX 275 50640 Mtexels/sec
Difference: 29360 (58%)

Pixel Rate

The Radeon HD 7870 should be a lot (more or less 81%) better at full screen anti-aliasing than the GeForce GTX 275, and will be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7870 32000 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 14276 (81%)

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

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
Manufacturer nVidia AMD
Year April 9, 2009 March 2012
Code Name G200b Pitcairn XT
Memory 896 MB 2048 MB
Core Speed 633 MHz 1000 MHz
Memory Speed 2268 MHz 4800 MHz
Power (Max TDP) 219 watts 175 watts
Bandwidth 127008 MB/sec 153600 MB/sec
Texel Rate 50640 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 240 1280
Texture Mapping Units 80 80
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: Bandwidth is the max amount of data (in units of MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This 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 video card will be at handling 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 the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines 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 also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 7870

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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