GeForce GTS 450 1GB vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which has core clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 42 Watts (66%)

Memory Bandwidth

Performance-wise, the GeForce GTX 650 should in theory be quite a bit superior to the GeForce GTS 450 1GB overall. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 22272 (39%)

Texel Rate

The GeForce GTX 650 is quite a bit (more or less 35%) faster with regards to anisotropic filtering than the GeForce GTS 450 1GB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GTS 450 1GB		25056 Mtexels/sec
	Difference: 8800 (35%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 650 is the winner, by far. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GTS 450 1GB		12528 Mpixels/sec
	Difference: 4400 (35%)

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 transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of 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.