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GeForce GTX 960 vs Radeon HD 4850 X2 1GB

Intro

The GeForce GTX 960 comes with a core clock speed of 1127 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is made up of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 4850 X2 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 625 MHz. The GDDR3 memory works at a frequency of 993 MHz on this specific card. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 960		120 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 130 Watts (108%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB should perform just a bit faster than the GeForce GTX 960 in general. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
GeForce GTX 960		112000 MB/sec
	Difference: 15104 (13%)

Texel Rate

The GeForce GTX 960 should be a lot (more or less 44%) faster with regards to texture filtering than the Radeon HD 4850 X2 1GB. (explain)

GeForce GTX 960		72128 Mtexels/sec
Radeon HD 4850 X2 1GB		50000 Mtexels/sec
	Difference: 22128 (44%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 960 is the winner, and very much so. (explain)

GeForce GTX 960		36064 Mpixels/sec
Radeon HD 4850 X2 1GB		20000 Mpixels/sec
	Difference: 16064 (80%)

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 960

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Radeon HD 4850 X2 1GB

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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 960	Radeon HD 4850 X2 1GB
Manufacturer	nVidia	AMD
Year	January 2015	Nov 7, 2008
Code Name	GM206	R700
Memory	2048 MB	1024 MB (x2)
Core Speed	1127 MHz	625 MHz (x2)
Memory Speed	7000 MHz	1986 MHz (x2)
Power (Max TDP)	120 watts	250 watts
Bandwidth	112000 MB/sec	127104 MB/sec
Texel Rate	72128 Mtexels/sec	50000 Mtexels/sec
Pixel Rate	36064 Mpixels/sec	20000 Mpixels/sec
Unified Shaders	1024	800(160x5) (x2)
Texture Mapping Units	64	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 (counted in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 applied per second. This figure is worked out by multiplying the total number of 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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