Radeon HD 4670 1GB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon R9 M390X		125 Watts
	Difference: 55 Watts (79%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M390X should theoretically be much superior to the Radeon HD 4670 1GB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 124800 (355%)

Texel Rate

The Radeon R9 M390X should be a lot (approximately 286%) more effective at AF than the Radeon HD 4670 1GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 68544 (286%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M390X is the winner, by far. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 17136 (286%)

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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it must 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 anti-aliasing, 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 amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.