GeForce GT 450 (OEM) vs GeForce GTX 870M

Intro

Compare all that to the GeForce GTX 870M, which features a core clock speed of 941 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 192-bit memory bus, and makes use of a 28 nm design. It is made up of 1344 SPUs, 112 TAUs, and 24 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
GeForce GTX 870M		110 Watts
	Difference: 4 Watts (4%)

Memory Bandwidth

Both cards have the exact same bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The GeForce GTX 870M should be quite a bit (about 456%) more effective at texture filtering than the GeForce GT 450 (OEM). (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 86432 (456%)

Pixel Rate

The GeForce GTX 870M is just a bit (about 19%) better at FSAA than the GeForce GT 450 (OEM), and should be capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 3624 (19%)

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 max amount of data (counted in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If 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 number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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