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GeForce GTX 950 vs Radeon HD 4870 X2

Intro

The GeForce GTX 950 comes with a core clock speed of 1024 MHz and a GDDR5 memory frequency of 1652 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 768 SPUs, 48 Texture Address Units, and 32 Raster Operation Units.

Compare all that to the Radeon HD 4870 X2, which comes with core clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. 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 950 90 Watts
Radeon HD 4870 X2 350 Watts
Difference: 260 Watts (289%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 X2 should theoretically be quite a bit superior to the GeForce GTX 950 overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GTX 950 105728 MB/sec
Difference: 124672 (118%)

Texel Rate

The Radeon HD 4870 X2 will be a lot (more or less 22%) faster with regards to AF than the GeForce GTX 950. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
GeForce GTX 950 49152 Mtexels/sec
Difference: 10848 (22%)

Pixel Rate

The GeForce GTX 950 should be a lot (more or less 37%) faster with regards to full screen anti-aliasing than the Radeon HD 4870 X2, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 950 32768 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 8768 (37%)

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 950

Amazon.com

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Radeon HD 4870 X2

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 950 Radeon HD 4870 X2
Manufacturer nVidia AMD
Year August 2015 Aug 12, 2008
Code Name GM206 R700
Memory 2048 MB 1024 MB (x2)
Core Speed 1024 MHz 750 MHz (x2)
Memory Speed 6608 MHz 3600 MHz (x2)
Power (Max TDP) 90 watts 350 watts
Bandwidth 105728 MB/sec 230400 MB/sec
Texel Rate 49152 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 32768 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 768 800(160x5) (x2)
Texture Mapping Units 48 40 (x2)
Render Output Units 32 16 (x2)
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 2940 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 12.0 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, the result 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 AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 950

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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