GeForce GT 130 vs Radeon HD 7770

Intro

Compare that to the Radeon HD 7770, which features a core clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit bus, and uses a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 130		75 Watts
Radeon HD 7770		80 Watts
	Difference: 5 Watts (7%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 is 500% quicker than the GeForce GT 130 in general, due to its higher bandwidth. (explain)

Radeon HD 7770		72000 MB/sec
GeForce GT 130		12000 MB/sec
	Difference: 60000 (500%)

Texel Rate

The Radeon HD 7770 should be much (approximately 233%) better at anisotropic filtering than the GeForce GT 130. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce GT 130		12000 Mtexels/sec
	Difference: 28000 (233%)

Pixel Rate

The Radeon HD 7770 will be quite a bit (about 100%) more effective at FSAA than the GeForce GT 130, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce GT 130		8000 Mpixels/sec
	Difference: 8000 (100%)

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 information (in units of MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated 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 filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.