GeForce 8500 GT vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which features core clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT		45 Watts
Radeon HD 7770		80 Watts
	Difference: 35 Watts (78%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 should be 463% faster than the GeForce 8500 GT in general, because of its greater bandwidth. (explain)

Radeon HD 7770		72000 MB/sec
GeForce 8500 GT		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon HD 7770 will be a lot (approximately 1011%) better at texture filtering than the GeForce 8500 GT. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce 8500 GT		3600 Mtexels/sec
	Difference: 36400 (1011%)

Pixel Rate

The Radeon HD 7770 should be much (more or less 789%) faster with regards to FSAA than the GeForce 8500 GT, and also able to handle higher resolutions while still performing well. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce 8500 GT		1800 Mpixels/sec
	Difference: 14200 (789%)

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 data (counted in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is worked out 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.