GeForce 9400 GT 256MB vs GeForce GTX 650

Intro

Compare all that to the GeForce GTX 650, which features core clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
GeForce GTX 650		64 Watts
	Difference: 14 Watts (28%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 650 should in theory be much superior to the GeForce 9400 GT 256MB in general. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 67200 (525%)

Texel Rate

The GeForce GTX 650 will be a lot (more or less 669%) faster with regards to AF than the GeForce 9400 GT 256MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 29456 (669%)

Pixel Rate

The GeForce GTX 650 should be quite a bit (more or less 669%) better at full screen anti-aliasing than the GeForce 9400 GT 256MB, and also should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 14728 (669%)

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 data (counted in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out 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 outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.