GeForce GTX 650 vs Geforce GTX 690

Intro

Compare all of that to the Geforce GTX 690, which features GPU clock speed of 915 MHz, and 2048 MB of GDDR5 memory running at 1502 MHz through a 256-bit bus. It also is made up of 1536 SPUs, 128 Texture Address Units, and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Geforce GTX 690		300 Watts
	Difference: 236 Watts (369%)

Memory Bandwidth

Theoretically, the Geforce GTX 690 should be a lot faster than the GeForce GTX 650 in general. (explain)

Geforce GTX 690		384512 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 304512 (381%)

Texel Rate

The Geforce GTX 690 will be much (approximately 592%) better at texture filtering than the GeForce GTX 650. (explain)

Geforce GTX 690		234240 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 200384 (592%)

Pixel Rate

The Geforce GTX 690 is quite a bit (approximately 246%) more effective at anti-aliasing than the GeForce GTX 650, and will be capable of handling higher resolutions more effectively. (explain)

Geforce GTX 690		58560 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 41632 (246%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.