Radeon HD 4670 512MB vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has set the core frequency at 1050 MHz. The GDDR5 memory works at a speed of 1500 MHz on this card. It features 2816 SPUs along with 176 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 205 Watts (293%)

Memory Bandwidth

The Radeon R9 390X 8G should theoretically be quite a bit faster than the Radeon HD 4670 512MB in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 352000 (1100%)

Texel Rate

The Radeon R9 390X 8G is a lot (more or less 670%) more effective at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 160800 (670%)

Pixel Rate

The Radeon R9 390X 8G should be a lot (about 1020%) more effective at anti-aliasing than the Radeon HD 4670 512MB, and will be able to handle higher screen resolutions better. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 61200 (1020%)

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 largest amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.