GeForce 920M vs GeForce GTS 450 1GB

Intro

Compare those specifications to the GeForce GTS 450 1GB, which has a clock speed of 783 MHz and a GDDR5 memory speed of 902 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It features 192 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GTS 450 1GB should be quite a bit faster than the GeForce 920M overall. (explain)

GeForce GTS 450 1GB		57728 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 43328 (301%)

Texel Rate

The GeForce 920M is quite a bit (approximately 22%) faster with regards to texture filtering than the GeForce GTS 450 1GB. (explain)

GeForce 920M		30528 Mtexels/sec
GeForce GTS 450 1GB		25056 Mtexels/sec
	Difference: 5472 (22%)

Pixel Rate

The GeForce GTS 450 1GB is a lot (approximately 64%) faster with regards to FSAA than the GeForce 920M, and also able to handle higher resolutions without losing too much performance. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 4896 (64%)

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 max amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.