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GeForce GTX 860M vs Radeon HD 4850 X2 1GB

Intro

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

Compare all that to the Radeon HD 4850 X2 1GB, which has a clock frequency of 625 MHz and a GDDR3 memory speed of 993 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It features 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 1GB 250 Watts
Difference: 205 Watts (456%)

Memory Bandwidth

The Radeon HD 4850 X2 1GB should in theory be quite a bit faster than the GeForce GTX 860M overall. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce GTX 860M 64000 MB/sec
Difference: 63104 (99%)

Texel Rate

The GeForce GTX 860M will be a lot (approximately 53%) more effective at texture filtering than the Radeon HD 4850 X2 1GB. (explain)

GeForce GTX 860M 76512 Mtexels/sec
Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Difference: 26512 (53%)

Pixel Rate

The Radeon HD 4850 X2 1GB will be much (about 57%) more effective at full screen anti-aliasing than the GeForce GTX 860M, and also should be able to handle higher screen resolutions better. (explain)

Radeon HD 4850 X2 1GB 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

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Radeon HD 4850 X2 1GB

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 860M Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year March 12 2014 Nov 7, 2008
Code Name GM107 R700
Memory 4096 MB 1024 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: Bandwidth is the largest amount of information (measured in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 860M

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

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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