GeForce 9400 GT 256MB vs Radeon HD 7750

Intro

Compare those specs to the Radeon HD 7750, which features a clock speed of 800 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It features 512 SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
Radeon HD 7750		55 Watts
	Difference: 5 Watts (10%)

Memory Bandwidth

The Radeon HD 7750, in theory, should be a lot faster than the GeForce 9400 GT 256MB in general. (explain)

Radeon HD 7750		72000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon HD 7750 is much (about 482%) faster with regards to texture filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 7750		25600 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 21200 (482%)

Pixel Rate

The Radeon HD 7750 will be much (more or less 482%) better at FSAA than the GeForce 9400 GT 256MB, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7750		12800 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 10600 (482%)

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 largest amount of information (in units of MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.