GeForce GTS 150 vs GeForce GTS 450

Intro

Compare those specs to the GeForce GTS 450, which comes with GPU clock speed of 783 MHz, and 512 MB of GDDR5 RAM set to run at 902 MHz through a 128-bit bus. It also is made up of 192 Stream Processors, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450		106 Watts
GeForce GTS 150		141 Watts
	Difference: 35 Watts (33%)

Memory Bandwidth

Theoretically, the GeForce GTS 450 should perform much faster than the GeForce GTS 150 in general. (explain)

GeForce GTS 450		57728 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 25728 (80%)

Texel Rate

The GeForce GTS 150 should be quite a bit (approximately 89%) better at texture filtering than the GeForce GTS 450. (explain)

GeForce GTS 150		47360 Mtexels/sec
GeForce GTS 450		25056 Mtexels/sec
	Difference: 22304 (89%)

Pixel Rate

The GeForce GTS 450 is a bit (more or less 6%) more effective at anti-aliasing than the GeForce GTS 150, and will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTS 450		12528 Mpixels/sec
GeForce GTS 150		11840 Mpixels/sec
	Difference: 688 (6%)

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 maximum amount of information (in units of MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.