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GeForce GTX 650 Ti vs Radeon HD 7870

Intro

The GeForce GTX 650 Ti has clock speeds of 928 MHz on the GPU, and 1350 MHz on the 1024 MB of GDDR5 RAM. It features 768 SPUs along with 64 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 7870, which comes with a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also features 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

(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 should be a lot faster than the GeForce GTX 650 Ti overall. (explain)

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

Texel Rate

The Radeon HD 7870 is a lot (approximately 35%) faster with regards to texture filtering 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 much (more or less 116%) more effective at AA than the GeForce GTX 650 Ti, and also will be able to handle higher screen resolutions better. (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

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

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 1350 MHz (5400 MHz effective) 1200 MHz (4800 MHz effective)
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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out 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 also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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