Radeon HD 4670 1GB vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which makes use of a 28 nm design. AMD has clocked the core speed at 1100 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular card. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M385X will be 173% faster than the Radeon HD 4670 1GB in general, because of its higher data rate. (explain)

Radeon R9 M385X		96000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 60800 (173%)

Texel Rate

The Radeon R9 M385X should be quite a bit (approximately 157%) better at anisotropic filtering than the Radeon HD 4670 1GB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 37600 (157%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M385X is a better choice, by a large margin. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 11600 (193%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.