GeForce 8800 GTX vs Radeon HD 7770

Intro

Compare those specs to the Radeon HD 7770, which uses a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM works at a frequency of 1125 MHz on this particular card. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce 8800 GTX		155 Watts
	Difference: 75 Watts (94%)

Memory Bandwidth

In theory, the GeForce 8800 GTX should be 20% quicker than the Radeon HD 7770 in general, due to its higher data rate. (explain)

GeForce 8800 GTX		86400 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 14400 (20%)

Texel Rate

The Radeon HD 7770 should be just a bit (about 9%) faster with regards to AF than the GeForce 8800 GTX. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce 8800 GTX		36800 Mtexels/sec
	Difference: 3200 (9%)

Pixel Rate

The Radeon HD 7770 will be a small bit (approximately 16%) faster with regards to AA than the GeForce 8800 GTX, and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce 8800 GTX		13800 Mpixels/sec
	Difference: 2200 (16%)

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 max amount of information (in units of MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.