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GeForce GTX 850M vs Radeon HD 4830 512MB

Intro

The GeForce GTX 850M has a core clock frequency of 876 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 4830 512MB, which features core speeds of 575 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M 40 Watts
Radeon HD 4830 512MB 95 Watts
Difference: 55 Watts (138%)

Memory Bandwidth

In theory, the Radeon HD 4830 512MB is 80% quicker than the GeForce GTX 850M overall, due to its higher data rate. (explain)

Radeon HD 4830 512MB 57600 MB/sec
GeForce GTX 850M 32000 MB/sec
Difference: 25600 (80%)

Texel Rate

The GeForce GTX 850M should be a lot (approximately 90%) faster with regards to texture filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 850M 35040 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 16640 (90%)

Pixel Rate

The GeForce GTX 850M should be a lot (more or less 52%) more effective at full screen anti-aliasing than the Radeon HD 4830 512MB, and should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 850M 14016 Mpixels/sec
Radeon HD 4830 512MB 9200 Mpixels/sec
Difference: 4816 (52%)

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 850M

Amazon.com

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Radeon HD 4830 512MB

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 850M Radeon HD 4830 512MB
Manufacturer nVidia AMD
Year March 12 2014 Oct 21, 2008
Code Name GM107 RV770 LE
Memory 2048 MB 512 MB
Core Speed 876 MHz 575 MHz
Memory Speed 2000 MHz 1800 MHz
Power (Max TDP) 40 watts 95 watts
Bandwidth 32000 MB/sec 57600 MB/sec
Texel Rate 35040 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 14016 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 640 640(128x5)
Texture Mapping Units 40 32
Render Output Units 16 16
Bus Type DDR3 GDDR3
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, 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 amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 850M

Amazon.com

Check prices at:

Radeon HD 4830 512MB

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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