Radeon HD 4670 1GB vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which has a clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

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

Theoretically, the Radeon R9 M390X should be quite a bit faster than 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 is quite a bit (approximately 286%) faster with regards to 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

The Radeon R9 M390X should be quite a bit (approximately 286%) better at FSAA than the Radeon HD 4670 1GB, and capable of handling higher screen resolutions without losing too much performance. (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: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the 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 higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.