GeForce GT 340 vs GeForce GTS 450 1GB

Intro

Compare that to the GeForce GTS 450 1GB, which has a core clock frequency of 783 MHz and a GDDR5 memory frequency of 902 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is comprised of 192 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

The GeForce GTS 450 1GB should in theory perform a bit faster than the GeForce GT 340 overall. (explain)

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

Texel Rate

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

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

Pixel Rate

The GeForce GTS 450 1GB is much (about 185%) more effective at anti-aliasing than the GeForce GT 340, and also will be able to handle higher resolutions better. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
GeForce GT 340		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 data (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core 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 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 ability to get to the maximum fill rate.