GeForce GT 315 vs GeForce GTS 450

Intro

Compare all that to the GeForce GTS 450, which features a clock frequency of 783 MHz and a GDDR5 memory speed of 902 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 192 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
GeForce GTS 450		106 Watts
	Difference: 54 Watts (104%)

Memory Bandwidth

In theory, the GeForce GTS 450 is 128% quicker than the GeForce GT 315 overall, because of its greater bandwidth. (explain)

GeForce GTS 450		57728 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 32448 (128%)

Texel Rate

The GeForce GTS 450 will be quite a bit (about 151%) better at anisotropic filtering than the GeForce GT 315. (explain)

GeForce GTS 450		25056 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 15056 (151%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTS 450 is a better choice, and very much so. (explain)

GeForce GTS 450		12528 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 7528 (151%)

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 (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.