Radeon HD 4670 512MB vs Radeon R9 M265X

Intro

Compare all of that to the Radeon R9 M265X, which has a core clock frequency of 575 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon R9 M265X should be a lot faster than the Radeon HD 4670 512MB overall. (explain)

Radeon R9 M265X		72000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 40000 (125%)

Texel Rate

The Radeon HD 4670 512MB will be just a bit (more or less 4%) faster with regards to AF than the Radeon R9 M265X. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 1000 (4%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M265X is superior to the Radeon HD 4670 512MB, by a large margin. (explain)

Radeon R9 M265X		9200 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 3200 (53%)

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 (counted in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.