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GeForce GTX 870M vs Radeon HD 4870 X2

Intro

The GeForce GTX 870M features core clock speeds of 941 MHz on the GPU, and 1000 MHz on the 3072 MB of GDDR5 memory. It features 1344 SPUs as well as 112 Texture Address Units and 24 ROPs.

Compare all of that to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM runs at a frequency of 900 MHz on this specific card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M 110 Watts
Radeon HD 4870 X2 350 Watts
Difference: 240 Watts (218%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 should perform much faster than the GeForce GTX 870M overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GTX 870M 96000 MB/sec
Difference: 134400 (140%)

Texel Rate

The GeForce GTX 870M will be quite a bit (more or less 76%) faster with regards to texture filtering than the Radeon HD 4870 X2. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 45392 (76%)

Pixel Rate

The Radeon HD 4870 X2 will be a small bit (approximately 6%) more effective at FSAA than the GeForce GTX 870M, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
GeForce GTX 870M 22584 Mpixels/sec
Difference: 1416 (6%)

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 870M

Amazon.com

Check prices at:

Radeon HD 4870 X2

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 870M Radeon HD 4870 X2
Manufacturer nVidia AMD
Year March 12 2014 Aug 12, 2008
Code Name GK104 R700
Memory 3072 MB 1024 MB (x2)
Core Speed 941 MHz 750 MHz (x2)
Memory Speed 4000 MHz 3600 MHz (x2)
Power (Max TDP) 110 watts 350 watts
Bandwidth 96000 MB/sec 230400 MB/sec
Texel Rate 105392 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 1344 800(160x5) (x2)
Texture Mapping Units 112 40 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR5 GDDR5
Bus Width 192-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 maximum amount of information (measured in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's bus 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 memory bandwidth, the better 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 are applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock 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 output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 870M

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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