GeForce 9800 GTX+ vs GeForce GTX 580

Intro

Compare that to the GeForce GTX 580, which uses a 40 nm design. nVidia has set the core speed at 772 MHz. The GDDR5 RAM works at a speed of 1002 MHz on this specific card. It features 512 SPUs along with 64 Texture Address Units and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX+		145 Watts
GeForce GTX 580		244 Watts
	Difference: 99 Watts (68%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 580 should theoretically be quite a bit superior to the GeForce 9800 GTX+ overall. (explain)

GeForce GTX 580		192384 MB/sec
GeForce 9800 GTX+		70400 MB/sec
	Difference: 121984 (173%)

Texel Rate

The GeForce GTX 580 is a small bit (approximately 5%) faster with regards to texture filtering than the GeForce 9800 GTX+. (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce 9800 GTX+		47232 Mtexels/sec
	Difference: 2176 (5%)

Pixel Rate

The GeForce GTX 580 will be a lot (about 214%) better at anti-aliasing than the GeForce 9800 GTX+, and also capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce 9800 GTX+		11808 Mpixels/sec
	Difference: 25248 (214%)

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 maximum amount of data (counted in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock 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 output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.