GeForce GTS 450 1GB vs GeForce GTX 285 2GB

Intro

Compare those specifications to the GeForce GTX 285 2GB, which features a clock frequency of 648 MHz and a GDDR3 memory speed of 1242 MHz. It also makes use of a 512-bit memory bus, and uses a 55 nm design. It features 240 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB		106 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 98 Watts (92%)

Memory Bandwidth

In theory, the GeForce GTX 285 2GB should be much faster than the GeForce GTS 450 1GB overall. (explain)

GeForce GTX 285 2GB		158976 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 101248 (175%)

Texel Rate

The GeForce GTX 285 2GB is quite a bit (approximately 107%) better at AF than the GeForce GTS 450 1GB. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
GeForce GTS 450 1GB		25056 Mtexels/sec
	Difference: 26784 (107%)

Pixel Rate

The GeForce GTX 285 2GB is a lot (approximately 66%) faster with regards to anti-aliasing than the GeForce GTS 450 1GB, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 285 2GB		20736 Mpixels/sec
GeForce GTS 450 1GB		12528 Mpixels/sec
	Difference: 8208 (66%)

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 (measured in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 max fill rate.