GeForce 9800 GT 512MB vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which has a core clock speed of 1058 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised 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 GT 512MB		105 Watts
	Difference: 41 Watts (64%)

Memory Bandwidth

In theory, the GeForce GTX 650 should perform quite a bit faster than the GeForce 9800 GT 512MB in general. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 9800 GT 512MB		57600 MB/sec
	Difference: 22400 (39%)

Texel Rate

The GeForce GTX 650 is just a bit (more or less 1%) faster with regards to anisotropic filtering than the GeForce 9800 GT 512MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce 9800 GT 512MB		33600 Mtexels/sec
	Difference: 256 (1%)

Pixel Rate

The GeForce GTX 650 is much (about 76%) more effective at anti-aliasing than the GeForce 9800 GT 512MB, and also should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 9800 GT 512MB		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 max amount of information (in units of MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one 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 called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.