GeForce GTS 250 1GB vs GeForce GTX 465

Intro

Compare those specs to the GeForce GTX 465, which has a GPU core clock speed of 607 MHz, and 1024 MB of GDDR5 memory running at 802 MHz through a 256-bit bus. It also is made up of 352 Stream Processors, 44 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 250 1GB		145 Watts
GeForce GTX 465		200 Watts
	Difference: 55 Watts (38%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 465 should be much faster than the GeForce GTS 250 1GB overall. (explain)

GeForce GTX 465		102592 MB/sec
GeForce GTS 250 1GB		70400 MB/sec
	Difference: 32192 (46%)

Texel Rate

The GeForce GTS 250 1GB should be quite a bit (more or less 77%) faster with regards to anisotropic filtering than the GeForce GTX 465. (explain)

GeForce GTS 250 1GB		47232 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 20524 (77%)

Pixel Rate

The GeForce GTX 465 is quite a bit (approximately 64%) faster with regards to AA than the GeForce GTS 250 1GB, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 465		19424 Mpixels/sec
GeForce GTS 250 1GB		11808 Mpixels/sec
	Difference: 7616 (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 largest amount of information (counted in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. 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 many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.