GeForce 8800 GT 256MB vs Radeon HD 6770 1GB

Intro

Compare those specifications to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this model. It features 800 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 8800 GT 256MB		105 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 3 Watts (3%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB should perform quite a bit faster than the GeForce 8800 GT 256MB in general. (explain)

Radeon HD 6770 1GB		67200 MB/sec
GeForce 8800 GT 256MB		44800 MB/sec
	Difference: 22400 (50%)

Texel Rate

The Radeon HD 6770 1GB should be a bit (approximately 7%) more effective at texture filtering than the GeForce 8800 GT 256MB. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
GeForce 8800 GT 256MB		33600 Mtexels/sec
	Difference: 2400 (7%)

Pixel Rate

The Radeon HD 6770 1GB is a lot (about 50%) faster with regards to FSAA than the GeForce 8800 GT 256MB, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
GeForce 8800 GT 256MB		9600 Mpixels/sec
	Difference: 4800 (50%)

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 (in units of megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, 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 card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.