GeForce 9800 GT 1GB vs GeForce 9800 GTX

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 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 in theory be quite a bit better than the GeForce 9800 GT 1GB overall. (explain)

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

Texel Rate

The GeForce 9800 GTX should be a lot (about 29%) faster with regards to anisotropic filtering than the GeForce 9800 GT 1GB. (explain)

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

Pixel Rate

The GeForce 9800 GTX should be a small bit (approximately 13%) better at full screen anti-aliasing than the GeForce 9800 GT 1GB, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce 9800 GTX		10800 Mpixels/sec
GeForce 9800 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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core 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 maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.