GeForce 8800 GS vs Radeon HD 7770

Intro

Compare all that to the Radeon HD 7770, which has core clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 640 SPUs along with 40 TAUs 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 GS		105 Watts
	Difference: 25 Watts (31%)

Memory Bandwidth

The Radeon HD 7770 should theoretically perform a lot faster than the GeForce 8800 GS in general. (explain)

Radeon HD 7770		72000 MB/sec
GeForce 8800 GS		38400 MB/sec
	Difference: 33600 (88%)

Texel Rate

The Radeon HD 7770 will be a lot (approximately 52%) faster with regards to anisotropic filtering than the GeForce 8800 GS. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce 8800 GS		26400 Mtexels/sec
	Difference: 13600 (52%)

Pixel Rate

The Radeon HD 7770 should be a lot (approximately 142%) faster with regards to full screen anti-aliasing than the GeForce 8800 GS, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce 8800 GS		6600 Mpixels/sec
	Difference: 9400 (142%)

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 maximum amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 can be applied in one second. This figure is calculated by multiplying the total texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.