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Radeon HD 4850 X2 512MB vs Radeon R7 360

Intro

The Radeon HD 4850 X2 512MB uses a 55 nm design. AMD has clocked the core speed at 625 MHz. The GDDR3 RAM is set to run at a speed of 993 MHz on this card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon R7 360, which comes with GPU clock speed of 1050 MHz, and 2048 MB of GDDR5 RAM running at 1625 MHz through a 128-bit bus. It also is made up of 768 Stream Processors, 48 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 360		100 Watts
Radeon HD 4850 X2 512MB		250 Watts
	Difference: 150 Watts (150%)

Memory Bandwidth

The Radeon HD 4850 X2 512MB, in theory, should be a lot faster than the Radeon R7 360 overall. (explain)

Radeon HD 4850 X2 512MB		127104 MB/sec
Radeon R7 360		104000 MB/sec
	Difference: 23104 (22%)

Texel Rate

The Radeon R7 360 should be a little bit (more or less 1%) faster with regards to AF than the Radeon HD 4850 X2 512MB. (explain)

Radeon R7 360		50400 Mtexels/sec
Radeon HD 4850 X2 512MB		50000 Mtexels/sec
	Difference: 400 (1%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4850 X2 512MB is superior to the Radeon R7 360, not by a very large margin though. (explain)

Radeon HD 4850 X2 512MB		20000 Mpixels/sec
Radeon R7 360		16800 Mpixels/sec
	Difference: 3200 (19%)

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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Radeon HD 4850 X2 512MB

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Radeon R7 360

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Specifications

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Model	Radeon HD 4850 X2 512MB	Radeon R7 360
Manufacturer	AMD	AMD
Year	Nov 7, 2008	June 2015
Code Name	R700	Tobago
Memory	512 MB (x2)	2048 MB
Core Speed	625 MHz (x2)	1050 MHz
Memory Speed	1986 MHz (x2)	6500 MHz
Power (Max TDP)	250 watts	100 watts
Bandwidth	127104 MB/sec	104000 MB/sec
Texel Rate	50000 Mtexels/sec	50400 Mtexels/sec
Pixel Rate	20000 Mpixels/sec	16800 Mpixels/sec
Unified Shaders	800(160x5) (x2)	768
Texture Mapping Units	40 (x2)	48
Render Output Units	16 (x2)	16
Bus Type	GDDR3	GDDR5
Bus Width	256-bit (x2)	128-bit
Fab Process	55 nm	28 nm
Transistors	956 million	2080 million
Bus	PCIe 2.0 x16 (PCIe bridge)	PCIe 3.0 ×16
DirectX Version	DirectX 10.1	DirectX 12.0
OpenGL Version	OpenGL 3.0	OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's 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 amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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