GeForce GTX 650 vs GeForce GTX 660

Intro

Compare that to the GeForce GTX 660, which has a clock frequency of 980 MHz and a GDDR5 memory speed of 1502 MHz. It also features a 192-bit memory bus, and makes use of a 28 nm design. It is comprised of 960 SPUs, 80 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

Hide Graphs

Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 660		5063 points
GeForce GTX 650		2263 points
	Difference: 2800 (124%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTX 660		140 Watts
	Difference: 76 Watts (119%)

Memory Bandwidth

The GeForce GTX 660, in theory, should be quite a bit faster than the GeForce GTX 650 in general. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 64192 (80%)

Texel Rate

The GeForce GTX 660 will be a lot (more or less 132%) faster with regards to anisotropic filtering than the GeForce GTX 650. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 44544 (132%)

Pixel Rate

The GeForce GTX 660 should be much (more or less 39%) faster with regards to FSAA than the GeForce GTX 650, and also able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 6592 (39%)

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 information (counted in MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock 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 fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.