GeForce 9800 GX2 vs Radeon R7 250X

Intro

Compare those specs to the Radeon R7 250X, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X		95 Watts
GeForce 9800 GX2		197 Watts
	Difference: 102 Watts (107%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 is 78% quicker than the Radeon R7 250X in general, because of its higher data rate. (explain)

GeForce 9800 GX2		128000 MB/sec
Radeon R7 250X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce 9800 GX2 should be much (more or less 92%) faster with regards to AF than the Radeon R7 250X. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
Radeon R7 250X		40000 Mtexels/sec
	Difference: 36800 (92%)

Pixel Rate

The GeForce 9800 GX2 should be a bit (about 20%) faster with regards to FSAA than the Radeon R7 250X, and able to handle higher screen resolutions without losing too much performance. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
Radeon R7 250X		16000 Mpixels/sec
	Difference: 3200 (20%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.