GeForce 9800 GX2 vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which features a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
GeForce 9800 GX2		197 Watts
	Difference: 89 Watts (82%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 should perform a lot faster than the Radeon HD 6770 in general. (explain)

GeForce 9800 GX2		128000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 60800 (90%)

Texel Rate

The GeForce 9800 GX2 should be a lot (about 113%) better at AF than the Radeon HD 6770. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 40800 (113%)

Pixel Rate

The GeForce 9800 GX2 will be a lot (about 33%) faster with regards to full screen anti-aliasing than the Radeon HD 6770, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 4800 (33%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. 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 lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.