GeForce GT 340 1GB vs GeForce GTS 450

Intro

Compare all of that to the GeForce GTS 450, which makes use of a 40 nm design. nVidia has clocked the core speed at 783 MHz. The GDDR5 RAM runs at a frequency of 902 MHz on this model. It features 192 SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
GeForce GTS 450		106 Watts
	Difference: 37 Watts (54%)

Memory Bandwidth

As far as performance goes, the GeForce GTS 450 should theoretically be a bit better than the GeForce GT 340 1GB in general. (explain)

GeForce GTS 450		57728 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 3328 (6%)

Texel Rate

The GeForce GTS 450 will be quite a bit (about 42%) better at anisotropic filtering than the GeForce GT 340 1GB. (explain)

GeForce GTS 450		25056 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 7456 (42%)

Pixel Rate

The GeForce GTS 450 will be quite a bit (more or less 185%) faster with regards to full screen anti-aliasing than the GeForce GT 340 1GB, and able to handle higher resolutions better. (explain)

GeForce GTS 450		12528 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 8128 (185%)

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 max amount of information (measured in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.