Radeon HD 6670 (OEM) 1GB vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1500 MHz through a 128-bit bus. It also features 896 Stream Processors, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB		63 Watts
Radeon HD 7790		85 Watts
	Difference: 22 Watts (35%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7790 is 50% quicker than the Radeon HD 6670 (OEM) 1GB overall, due to its greater data rate. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 32000 (50%)

Texel Rate

The Radeon HD 7790 should be much (more or less 192%) better at AF than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 36800 (192%)

Pixel Rate

The Radeon HD 7790 will be much (about 150%) more effective at anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 9600 (150%)

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 information (in units of megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 processed in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.