Radeon HD 6570 (OEM) 2GB vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which features a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6570 (OEM) 2GB		50 Watts
Radeon HD 7790		85 Watts
	Difference: 35 Watts (70%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7790 should be 50% quicker than the Radeon HD 6570 (OEM) 2GB in general, because of its greater data rate. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 6570 (OEM) 2GB		64000 MB/sec
	Difference: 32000 (50%)

Texel Rate

The Radeon HD 7790 will be quite a bit (approximately 259%) faster with regards to texture filtering than the Radeon HD 6570 (OEM) 2GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
	Difference: 40400 (259%)

Pixel Rate

The Radeon HD 7790 should be much (approximately 208%) more effective at anti-aliasing than the Radeon HD 6570 (OEM) 2GB, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
	Difference: 10800 (208%)

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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.