GeForce GTS 250 1GB vs GeForce GTX 965M

Intro

Compare all of that to the GeForce GTX 965M, which features GPU clock speed of 944 MHz, and 2048 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is comprised of 1024 SPUs, 64 Texture Address Units, and 32 ROPs.

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 will be 10% quicker than the GeForce GTX 965M in general, because of 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 is a lot (approximately 28%) better at anisotropic 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 should be a lot (approximately 156%) more effective at full screen anti-aliasing than the GeForce GTS 250 1GB, and also should be able to handle higher resolutions more effectively. (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 maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.