GeForce GTS 250 1GB vs GeForce GTX 965M

Intro

Compare that to the GeForce GTX 965M, which has GPU core speed of 944 MHz, and 2048 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is comprised of 1024 Stream Processors, 64 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
GeForce GTS 250 1GB		145 Watts
	Difference: 85 Watts (142%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 250 1GB should be 10% quicker than the GeForce GTX 965M overall, due to its greater bandwidth. (explain)

GeForce GTS 250 1GB		70400 MB/sec
GeForce GTX 965M		64000 MB/sec
	Difference: 6400 (10%)

Texel Rate

The GeForce GTX 965M should be quite a bit (approximately 28%) more effective at texture filtering than the GeForce GTS 250 1GB. (explain)

GeForce GTX 965M		60416 Mtexels/sec
GeForce GTS 250 1GB		47232 Mtexels/sec
	Difference: 13184 (28%)

Pixel Rate

The GeForce GTX 965M is quite a bit (more or less 156%) better at anti-aliasing than the GeForce GTS 250 1GB, and also will be capable of handling higher screen resolutions better. (explain)

GeForce GTX 965M		30208 Mpixels/sec
GeForce GTS 250 1GB		11808 Mpixels/sec
	Difference: 18400 (156%)

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 information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.