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GeForce 820M vs Radeon HD 4750

Intro

The GeForce 820M comes with a clock speed of 719 MHz and a DDR3 memory frequency of 1000 MHz. It also uses a 64-bit memory bus, and uses a 28 nm design. It is comprised of 96 SPUs, 16 TAUs, and 4 ROPs.

Compare those specifications to the Radeon HD 4750, which comes with a clock frequency of 730 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
Radeon HD 4750 75 Watts
Difference: 60 Watts (400%)

Memory Bandwidth

Theoretically, the Radeon HD 4750 should be quite a bit faster than the GeForce 820M in general. (explain)

Radeon HD 4750 51200 MB/sec
GeForce 820M 16000 MB/sec
Difference: 35200 (220%)

Texel Rate

The Radeon HD 4750 will be much (approximately 103%) more effective at texture filtering than the GeForce 820M. (explain)

Radeon HD 4750 23360 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 11856 (103%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4750 is the winner, by far. (explain)

Radeon HD 4750 11680 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 8804 (306%)

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 820M

Amazon.com

Check prices at:

Radeon HD 4750

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.

Specifications

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Model GeForce 820M Radeon HD 4750
Manufacturer nVidia AMD
Year February 2014
Code Name GF117 RV740
Memory 2048 MB 512 MB
Core Speed 719 MHz 730 MHz
Memory Speed 2000 MHz 3200 MHz
Power (Max TDP) 15 watts 75 watts
Bandwidth 16000 MB/sec 51200 MB/sec
Texel Rate 11504 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 11680 Mpixels/sec
Unified Shaders 96 640(128x5)
Texture Mapping Units 16 32
Render Output Units 4 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 128-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 826 million
Bus PCIe 2.0 x16 PCIe 2.0 x16
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

Radeon HD 4750

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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