GeForce 820M vs GeForce GTX 280

Intro

Compare that to the GeForce GTX 280, which comes with GPU clock speed of 602 MHz, and 1024 MB of GDDR3 RAM running at 1107 MHz through a 512-bit bus. It also features 240 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce GTX 280		236 Watts
	Difference: 221 Watts (1473%)

Memory Bandwidth

In theory, the GeForce GTX 280 should be 786% quicker than the GeForce 820M in general, because of its higher data rate. (explain)

GeForce GTX 280		141696 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 125696 (786%)

Texel Rate

The GeForce GTX 280 should be quite a bit (approximately 319%) more effective at AF than the GeForce 820M. (explain)

GeForce GTX 280		48160 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 36656 (319%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 280 is superior to the GeForce 820M, and very much so. (explain)

GeForce GTX 280		19264 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 16388 (570%)

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 information (measured in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.