GeForce 9400 GT 256MB vs Radeon R7 240

Intro

Compare all of that to the Radeon R7 240, which has a core clock speed of 730 MHz and a DDR3 memory frequency of 900 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
GeForce 9400 GT 256MB		50 Watts
	Difference: 20 Watts (67%)

Memory Bandwidth

The Radeon R7 240 should in theory perform much faster than the GeForce 9400 GT 256MB overall. (explain)

Radeon R7 240		28800 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 16000 (125%)

Texel Rate

The Radeon R7 240 will be much (about 232%) more effective at texture filtering than the GeForce 9400 GT 256MB. (explain)

Radeon R7 240		14600 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 10200 (232%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R7 240 is a better choice, by far. (explain)

Radeon R7 240		5840 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 3640 (165%)

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 transferred over the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics 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 number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.