GeForce 9800 GT 1GB vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which has a core clock frequency of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce 9800 GT 1GB		105 Watts
	Difference: 41 Watts (64%)

Memory Bandwidth

In theory, the GeForce GTX 650 will be 39% quicker than the GeForce 9800 GT 1GB in general, because of its greater bandwidth. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 9800 GT 1GB		57600 MB/sec
	Difference: 22400 (39%)

Texel Rate

The GeForce GTX 650 is a little bit (approximately 1%) faster with regards to AF than the GeForce 9800 GT 1GB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce 9800 GT 1GB		33600 Mtexels/sec
	Difference: 256 (1%)

Pixel Rate

The GeForce GTX 650 will be quite a bit (more or less 76%) more effective at anti-aliasing than the GeForce 9800 GT 1GB, and also should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 9800 GT 1GB		9600 Mpixels/sec
	Difference: 7328 (76%)

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 data (counted in megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 are applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.