GeForce 8800 Ultra vs Radeon HD 6770

Intro

Compare all of that to the Radeon HD 6770, which has a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the GeForce 8800 Ultra should be much faster than the Radeon HD 6770 in general. (explain)

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

Texel Rate

The GeForce 8800 Ultra will be a little bit (approximately 9%) more effective at AF than the Radeon HD 6770. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 8800 Ultra is superior to the Radeon HD 6770, but only just. (explain)

GeForce 8800 Ultra		14688 Mpixels/sec
Radeon HD 6770		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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.