GeForce 9800 GTX vs GeForce GTX 650

Intro

Compare all of that to the GeForce GTX 650, which features a core clock frequency of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce 9800 GTX		140 Watts
	Difference: 76 Watts (119%)

Memory Bandwidth

Theoretically, the GeForce GTX 650 should be a bit faster than the GeForce 9800 GTX overall. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 9800 GTX		70400 MB/sec
	Difference: 9600 (14%)

Texel Rate

The GeForce 9800 GTX is a lot (about 28%) more effective at anisotropic filtering than the GeForce GTX 650. (explain)

GeForce 9800 GTX		43200 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 9344 (28%)

Pixel Rate

The GeForce GTX 650 is much (approximately 57%) more effective at AA than the GeForce 9800 GTX, and will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 9800 GTX		10800 Mpixels/sec
	Difference: 6128 (57%)

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 largest amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's interface 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 higher the bandwidth is, the faster 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 number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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