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

Intro

Compare those specs to the Radeon R9 390X 8G, which has core speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs as well as 176 TAUs and 64 Rasterization Operator Units.

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

In theory, the Radeon R9 390X 8G should be 1100% faster than the Radeon HD 4670 512MB in general, because of its greater bandwidth. (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 will be quite a bit (more or less 670%) faster with regards to 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 is a lot (more or less 1020%) better at anti-aliasing than the Radeon HD 4670 512MB, and should be capable of handling higher screen resolutions more effectively. (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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.