GeForce 8800 GTS (G80) 320MB vs GeForce GTS 250 1GB

Intro

Compare that to the GeForce GTS 250 1GB, which makes use of a 65/55 nm design. nVidia has clocked the core speed at 738 MHz. The GDDR3 memory runs at a speed of 1100 MHz on this model. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 320MB		143 Watts
GeForce GTS 250 1GB		145 Watts
	Difference: 2 Watts (1%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 250 1GB should perform a little bit faster than the GeForce 8800 GTS (G80) 320MB overall. (explain)

GeForce GTS 250 1GB		70400 MB/sec
GeForce 8800 GTS (G80) 320MB		63360 MB/sec
	Difference: 7040 (11%)

Texel Rate

The GeForce GTS 250 1GB will be much (more or less 92%) faster with regards to texture filtering than the GeForce 8800 GTS (G80) 320MB. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
	Difference: 22608 (92%)

Pixel Rate

The GeForce GTS 250 1GB should be a little bit (more or less 15%) faster with regards to anti-aliasing than the GeForce 8800 GTS (G80) 320MB, and also capable of handling higher resolutions better. (explain)

GeForce GTS 250 1GB		11808 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
	Difference: 1548 (15%)

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 largest amount of information (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 max fill rate.