GeForce 9400 GT 256MB vs Radeon R7 250X 2GB

Intro

Compare that to the Radeon R7 250X 2GB, which comes with GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also features 640 SPUs, 40 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 R7 250X 2GB		95 Watts
	Difference: 45 Watts (90%)

Memory Bandwidth

As far as performance goes, the Radeon R7 250X 2GB should theoretically be quite a bit better than the GeForce 9400 GT 256MB overall. (explain)

Radeon R7 250X 2GB		72000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon R7 250X 2GB should be a lot (more or less 809%) faster with regards to AF than the GeForce 9400 GT 256MB. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 35600 (809%)

Pixel Rate

The Radeon R7 250X 2GB is much (more or less 627%) more effective at full screen anti-aliasing than the GeForce 9400 GT 256MB, and should be able to handle higher resolutions while still performing well. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 13800 (627%)

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 (measured in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the 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 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 amount of colour ROPs by the clock 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.