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GeForce GTX 650 vs Radeon HD 4870 2GB

Intro

The GeForce GTX 650 uses a 28 nm design. nVidia has clocked the core frequency at 1058 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this particular model. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4870 2GB, which has core clock speeds of 750 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 4870 2GB 150 Watts
Difference: 86 Watts (134%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 2GB should theoretically be much superior to the GeForce GTX 650 overall. (explain)

Radeon HD 4870 2GB 115200 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 35200 (44%)

Texel Rate

The GeForce GTX 650 is a small bit (more or less 13%) better at texture filtering than the Radeon HD 4870 2GB. (explain)

GeForce GTX 650 33856 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 3856 (13%)

Pixel Rate

The GeForce GTX 650 should be a lot (about 41%) better at anti-aliasing than the Radeon HD 4870 2GB, and also capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 650 16928 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 4928 (41%)

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

Amazon.com

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Radeon HD 4870 2GB

Amazon.com

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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 Radeon HD 4870 2GB
Manufacturer nVidia AMD
Year September 2012 Jun 25, 2008
Code Name GK107 RV770 XT
Memory 1024 MB 2048 MB
Core Speed 1058 MHz 750 MHz
Memory Speed 5000 MHz 3600 MHz
Power (Max TDP) 64 watts 150 watts
Bandwidth 80000 MB/sec 115200 MB/sec
Texel Rate 33856 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 384 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 1300 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 650

Amazon.com

Check prices at:

Radeon HD 4870 2GB

Amazon.com

Check prices at:

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.

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