GeForce 8800 GT 1GB vs GeForce 9800 GTX

Intro

Compare those specs to the GeForce 9800 GTX, which has a clock frequency of 675 MHz and a GDDR3 memory frequency of 1100 MHz. It also makes use of a 256-bit bus, and makes use of a 65 nm design. It features 128 SPUs, 64 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 1GB		105 Watts
GeForce 9800 GTX		140 Watts
	Difference: 35 Watts (33%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GTX should theoretically be a lot better than the GeForce 8800 GT 1GB overall. (explain)

GeForce 9800 GTX		70400 MB/sec
GeForce 8800 GT 1GB		57600 MB/sec
	Difference: 12800 (22%)

Texel Rate

The GeForce 9800 GTX is much (more or less 29%) faster with regards to AF than the GeForce 8800 GT 1GB. (explain)

GeForce 9800 GTX		43200 Mtexels/sec
GeForce 8800 GT 1GB		33600 Mtexels/sec
	Difference: 9600 (29%)

Pixel Rate

The GeForce 9800 GTX will be a bit (approximately 13%) more effective at full screen anti-aliasing than the GeForce 8800 GT 1GB, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce 9800 GTX		10800 Mpixels/sec
GeForce 8800 GT 1GB		9600 Mpixels/sec
	Difference: 1200 (13%)

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 max amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.