GeForce 820M vs GeForce GTX 465

Intro

Compare all that to the GeForce GTX 465, which has a core clock speed of 607 MHz and a GDDR5 memory speed of 802 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is made up of 352 SPUs, 44 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 465		200 Watts
	Difference: 185 Watts (1233%)

Memory Bandwidth

Performance-wise, the GeForce GTX 465 should theoretically be a lot better than the GeForce 820M overall. (explain)

GeForce GTX 465		102592 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 86592 (541%)

Texel Rate

The GeForce GTX 465 is a lot (approximately 132%) more effective at texture filtering than the GeForce 820M. (explain)

GeForce GTX 465		26708 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 15204 (132%)

Pixel Rate

The GeForce GTX 465 will be a lot (about 575%) faster with regards to FSAA than the GeForce 820M, and also should be capable of handling higher resolutions better. (explain)

GeForce GTX 465		19424 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 16548 (575%)

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 maximum amount of data (in units of MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.