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GeForce GTX 950 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 950 has a clock frequency 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 ROPs.

Compare those specifications to the Radeon HD 4850 X2 512MB, which makes use of a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR3 RAM is set to run at a frequency of 993 MHz on this particular card. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

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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 be 20% quicker than the GeForce GTX 950 overall, because of its greater bandwidth. (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 should be just a bit (about 2%) faster with regards to texture filtering 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

The GeForce GTX 950 is a lot (approximately 64%) more effective at AA than the Radeon HD 4850 X2 512MB, and also will be capable of handling higher screen resolutions without slowing down too much. (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

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 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: Bandwidth is the largest amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, 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 most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially 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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