Radeon HD 4670 1GB vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which uses a 28 nm design. AMD has clocked the core speed at 1050 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this model. It features 2816 SPUs along with 176 Texture Address Units and 64 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 390X 8G		275 Watts
	Difference: 205 Watts (293%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G should be much faster than the Radeon HD 4670 1GB in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 348800 (991%)

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 1GB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 160800 (670%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 390X 8G is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 4670 1GB		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 max amount of data (measured in megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the 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 most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.