Radeon HD 4670 1GB vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which has core speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs as well as 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon HD 7790		85 Watts
	Difference: 15 Watts (21%)

Memory Bandwidth

Performance-wise, the Radeon HD 7790 should in theory be a lot superior to the Radeon HD 4670 1GB in general. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 60800 (173%)

Texel Rate

The Radeon HD 7790 is quite a bit (approximately 133%) more effective at anisotropic filtering than the Radeon HD 4670 1GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 32000 (133%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7790 is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 10000 (167%)

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 information (in units of MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.