GeForce 9800 GTX vs GeForce 9800 GTX+

Intro

Compare all of that to the GeForce 9800 GTX+, which makes use of a 55 nm design. nVidia has clocked the core speed at 738 MHz. The GDDR3 RAM works at a frequency of 1100 MHz on this model. It features 128 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX		140 Watts
GeForce 9800 GTX+		145 Watts
	Difference: 5 Watts (4%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so in theory they should have the same performance. (explain)

Texel Rate

The GeForce 9800 GTX+ will be just a bit (more or less 9%) better at texture filtering than the GeForce 9800 GTX. (explain)

GeForce 9800 GTX+		47232 Mtexels/sec
GeForce 9800 GTX		43200 Mtexels/sec
	Difference: 4032 (9%)

Pixel Rate

The GeForce 9800 GTX+ is just a bit (about 9%) faster with regards to FSAA than the GeForce 9800 GTX, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 9800 GTX+		11808 Mpixels/sec
GeForce 9800 GTX		10800 Mpixels/sec
	Difference: 1008 (9%)

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 (measured in MB per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's 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 are applied per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.