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GeForce GTX 650 vs Radeon HD 7850

Intro

The GeForce GTX 650 comes with a GPU core speed of 1058 MHz, and the 2048 MB of GDDR5 memory is set to run at 1250 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 ROPs.

Compare all of that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core frequency at 860 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this specific model. It features 1024 SPUs along with 64 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 7850 130 Watts
Difference: 66 Watts (103%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7850 should in theory be quite a bit better than the GeForce GTX 650 in general. (explain)

Radeon HD 7850 153600 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 73600 (92%)

Texel Rate

The Radeon HD 7850 is a lot (about 63%) more effective at AF than the GeForce GTX 650. (explain)

Radeon HD 7850 55040 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 21184 (63%)

Pixel Rate

The Radeon HD 7850 will be quite a bit (approximately 63%) better at FSAA than the GeForce GTX 650, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 7850 27520 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 10592 (63%)

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

Amazon.com

Radeon HD 7850

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 Radeon HD 7850
Manufacturer nVidia AMD
Year September 2012 March 2012
Code Name GK107 Pitcairn Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 1058 MHz 860 MHz
Shader Speed 1058 MHz (N/A) MHz
Memory Speed 1250 MHz (5000 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 384 1024
Texture Mapping Units 32 64
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) 64 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 80000 MB/sec 153600 MB/sec
Texel Rate 33856 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated 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 output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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