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GeForce GTX 650 vs Radeon HD 6870


Intro

The GeForce GTX 650 features a clock speed of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It features 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6870, which features core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs as well as 56 Texture Address Units and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6870 2870 points
GeForce GTX 650 2270 points
Difference: 600 (26%)

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

The Radeon HD 6870, in theory, should be a lot faster than the GeForce GTX 650 in general. (explain)

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

Texel Rate

The Radeon HD 6870 should be much (approximately 49%) more effective at 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 is much (more or less 70%) more effective at full screen anti-aliasing than the GeForce GTX 650, and will be capable of handling higher 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

GeForce GTX 650

Radeon HD 6870

Specifications

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Model GeForce GTX 650 Radeon HD 6870
Manufacturer nVidia AMD
Year September 2012 October 2010
Code Name GK107 Barts XT
Memory 1024 MB 1024 MB
Core Speed 1058 MHz 900 MHz
Memory Speed 5000 MHz 4200 MHz
Power (Max TDP) 64 watts 151 watts
Bandwidth 80000 MB/sec 134400 MB/sec
Texel Rate 33856 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 384 1120
Texture Mapping Units 32 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 1700 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units by the core clock 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 processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

GeForce GTX 650

Radeon HD 6870

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