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GeForce GTX 650 vs Radeon HD 4850 512MB


Intro

The GeForce GTX 650 comes with clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 RAM. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 4850 512MB, which has core speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 46 Watts (72%)

Memory Bandwidth

In theory, the GeForce GTX 650 is 26% faster than the Radeon HD 4850 512MB in general, because of its higher data rate. (explain)

GeForce GTX 650 80000 MB/sec
Radeon HD 4850 512MB 63552 MB/sec
Difference: 16448 (26%)

Texel Rate

The GeForce GTX 650 should be quite a bit (about 35%) better at anisotropic filtering than the Radeon HD 4850 512MB. (explain)

GeForce GTX 650 33856 Mtexels/sec
Radeon HD 4850 512MB 25000 Mtexels/sec
Difference: 8856 (35%)

Pixel Rate

The GeForce GTX 650 will be a lot (approximately 69%) more effective at full screen anti-aliasing than the Radeon HD 4850 512MB, and will be able to handle higher screen resolutions better. (explain)

GeForce GTX 650 16928 Mpixels/sec
Radeon HD 4850 512MB 10000 Mpixels/sec
Difference: 6928 (69%)

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

Radeon HD 4850 512MB

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 Radeon HD 4850 512MB
Manufacturer nVidia AMD
Year September 2012 Jun 25, 2008
Code Name GK107 RV770 PRO
Memory 1024 MB 512 MB
Core Speed 1058 MHz 625 MHz
Memory Speed 5000 MHz 1986 MHz
Power (Max TDP) 64 watts 110 watts
Bandwidth 80000 MB/sec 63552 MB/sec
Texel Rate 33856 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 384 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR3
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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 applied in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce GTX 650

Amazon.com

Radeon HD 4850 512MB

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.

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