GeForce 9800 GX2 vs GeForce GT 450 (OEM)

Intro

Compare all that to the GeForce GT 450 (OEM), which features a GPU core clock speed of 790 MHz, and 1536 MB of GDDR5 memory set to run at 1000 MHz through a 192-bit bus. It also features 144 SPUs, 24 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
GeForce 9800 GX2		197 Watts
	Difference: 91 Watts (86%)

Memory Bandwidth

The GeForce 9800 GX2 should theoretically be much faster than the GeForce GT 450 (OEM) overall. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 32000 (33%)

Texel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 305%) faster with regards to anisotropic filtering than the GeForce GT 450 (OEM). (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 57840 (305%)

Pixel Rate

The GeForce 9800 GX2 is just a bit (about 1%) better at AA than the GeForce GT 450 (OEM), and should be capable of handling higher resolutions more effectively. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 240 (1%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, the result 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 texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could 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 Render Output Units by the clock speed of the card. 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 quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.