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GeForce GTX 650 vs Radeon HD 6870

Intro

The GeForce GTX 650 features a clock frequency of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 128-bit bus, and uses a 28 nm design. It is comprised of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare that to the Radeon HD 6870, which features a GPU core clock speed of 900 MHz, and 1024 MB of GDDR5 RAM running at 1050 MHz through a 256-bit bus. It also is comprised of 1120 Stream Processors, 56 Texture Address Units, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 6870 151 Watts
Difference: 87 Watts (136%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6870 should be 68% faster than the GeForce GTX 650 in general, due to its greater bandwidth. (explain)

Radeon HD 6870 134400 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 54400 (68%)

Texel Rate

The Radeon HD 6870 should be a lot (approximately 49%) faster with regards to anisotropic filtering than the GeForce GTX 650. (explain)

Radeon HD 6870 50400 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 16544 (49%)

Pixel Rate

The Radeon HD 6870 should be a lot (more or less 70%) faster with regards to FSAA than the GeForce GTX 650, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 11872 (70%)

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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GTX 650

Amazon.com

Other US-based stores

Radeon HD 6870

Amazon.com

Other US-based stores

Specifications

Model GeForce GTX 650 Radeon HD 6870
Manufacturer nVidia ATi
Year September 2012 October 2010
Code Name GK107 Barts XT
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe x16
Memory 2048 MB 1024 MB
Core Speed 1058 MHz 900 MHz
Shader Speed 1058 MHz (N/A) MHz
Memory Speed 1250 MHz (5000 MHz effective) 1050 MHz (4200 MHz effective)
Unified Shaders 384 1120
Texture Mapping Units 32 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1
Power (Max TDP) 64 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 80000 MB/sec 134400 MB/sec
Texel Rate 33856 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 can be applied in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs 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 rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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