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GeForce GTX 650 Ti vs Radeon HD 7870

Intro

The GeForce GTX 650 Ti uses a 28 nm design. nVidia has clocked the core frequency at 928 MHz. The GDDR5 memory is set to run at a speed of 1350 MHz on this particular model. It features 768 SPUs along with 64 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 7870, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this card. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 110 Watts
Radeon HD 7870 175 Watts
Difference: 65 Watts (59%)

Memory Bandwidth

In theory, the Radeon HD 7870 will be 78% quicker than the GeForce GTX 650 Ti overall, because of its higher data rate. (explain)

Radeon HD 7870 153600 MB/sec
GeForce GTX 650 Ti 86400 MB/sec
Difference: 67200 (78%)

Texel Rate

The Radeon HD 7870 is quite a bit (more or less 35%) better at AF than the GeForce GTX 650 Ti. (explain)

Radeon HD 7870 80000 Mtexels/sec
GeForce GTX 650 Ti 59392 Mtexels/sec
Difference: 20608 (35%)

Pixel Rate

The Radeon HD 7870 should be quite a bit (approximately 116%) better at anti-aliasing than the GeForce GTX 650 Ti, and also should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7870 32000 Mpixels/sec
GeForce GTX 650 Ti 14848 Mpixels/sec
Difference: 17152 (116%)

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 650 Ti

Amazon.com

Radeon HD 7870

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 650 Ti Radeon HD 7870
Manufacturer nVidia AMD
Year October 2012 March 2012
Code Name GK106 Pitcairn XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 928 MHz 1000 MHz
Shader Speed 928 MHz (N/A) MHz
Memory Speed 5400 MHz 4800 MHz
Unified Shaders 768 1280
Texture Mapping Units 64 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2
Power (Max TDP) 110 watts 175 watts
Shader Model 5.0 5.0
Bandwidth 86400 MB/sec 153600 MB/sec
Texel Rate 59392 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 32000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, 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 most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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