GeForce GTS 450 1GB vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which has GPU core speed of 1058 MHz, and 1024 MB of GDDR5 memory set to run at 1250 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 32 TAUs, and 16 ROPs.

Display Graphs

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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

The GeForce GTX 650 should theoretically perform a lot faster than 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 will be much (more or less 35%) more effective at AF 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

The GeForce GTX 650 will be a lot (about 35%) more effective at AA than the GeForce GTS 450 1GB, and will be capable of handling higher screen resolutions while still performing well. (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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated 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 filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.