GeForce 8800 Ultra vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this particular model. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce 8800 Ultra		171 Watts
	Difference: 63 Watts (58%)

Memory Bandwidth

Performance-wise, the GeForce 8800 Ultra should in theory be much superior to the Radeon HD 6770 1GB in general. (explain)

GeForce 8800 Ultra		103680 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 36480 (54%)

Texel Rate

The GeForce 8800 Ultra should be a small bit (about 9%) more effective at AF than the Radeon HD 6770 1GB. (explain)

GeForce 8800 Ultra		39168 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 3168 (9%)

Pixel Rate

The GeForce 8800 Ultra will be a small bit (approximately 2%) faster with regards to anti-aliasing than the Radeon HD 6770 1GB, and should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce 8800 Ultra		14688 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 288 (2%)

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 (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling 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 record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.