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GeForce GTX 950 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 950 has a GPU core clock speed of 1024 MHz, and the 2048 MB of GDDR5 memory is set to run at 1652 MHz through a 128-bit bus. It also features 768 Stream Processors, 48 TAUs, and 32 Raster Operation Units.

Compare all that to the Radeon HD 4850 X2 512MB, which features a core clock frequency of 625 MHz and a GDDR3 memory frequency 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 950 90 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 160 Watts (178%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 512MB should perform a little bit faster than the GeForce GTX 950 overall. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce GTX 950 105728 MB/sec
Difference: 21376 (20%)

Texel Rate

The Radeon HD 4850 X2 512MB will be just a bit (about 2%) faster with regards to AF than the GeForce GTX 950. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
GeForce GTX 950 49152 Mtexels/sec
Difference: 848 (2%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 950 is a better choice, and very much so. (explain)

GeForce GTX 950 32768 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 12768 (64%)

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 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 950 Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year August 2015 Nov 7, 2008
Code Name GM206 R700
Memory 2048 MB 512 MB (x2)
Core Speed 1024 MHz 625 MHz (x2)
Memory Speed 6608 MHz 1986 MHz (x2)
Power (Max TDP) 90 watts 250 watts
Bandwidth 105728 MB/sec 127104 MB/sec
Texel Rate 49152 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 32768 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 768 800(160x5) (x2)
Texture Mapping Units 48 40 (x2)
Render Output Units 32 16 (x2)
Bus Type GDDR5 GDDR3
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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GTX 950

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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