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GeForce GTX 860M vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 860M comes with a core clock speed of 797 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It features 1152 SPUs, 96 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 4850 X2 512MB, which comes with a core clock speed of 625 MHz and a GDDR3 memory speed of 993 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 860M 45 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 205 Watts (456%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 512MB should be 99% quicker than the GeForce GTX 860M overall, due to its greater data rate. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce GTX 860M 64000 MB/sec
Difference: 63104 (99%)

Texel Rate

The GeForce GTX 860M should be a lot (approximately 53%) better at anisotropic filtering than the Radeon HD 4850 X2 512MB. (explain)

GeForce GTX 860M 76512 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 26512 (53%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be much (approximately 57%) faster with regards to anti-aliasing than the GeForce GTX 860M, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
GeForce GTX 860M 12752 Mpixels/sec
Difference: 7248 (57%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 860M

Amazon.com

Check prices at:

Radeon HD 4850 X2 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.

Specifications

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Model GeForce GTX 860M Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year March 12 2014 Nov 7, 2008
Code Name GM107 R700
Memory 4096 MB 512 MB (x2)
Core Speed 797 MHz 625 MHz (x2)
Memory Speed 4000 MHz 1986 MHz (x2)
Power (Max TDP) 45 watts 250 watts
Bandwidth 64000 MB/sec 127104 MB/sec
Texel Rate 76512 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 12752 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 1152 800(160x5) (x2)
Texture Mapping Units 96 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
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 (in units of megabytes per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 ability to reach the maximum fill rate.

Display Prices

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GeForce GTX 860M

Amazon.com

Check prices at:

Radeon HD 4850 X2 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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