GeForce 9800 GX2 vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which features a core clock speed of 575 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should theoretically be a lot superior to the Radeon R9 M265X overall. (explain)

GeForce 9800 GX2		128000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 56000 (78%)

Texel Rate

The GeForce 9800 GX2 will be a lot (approximately 234%) more effective at texture filtering than the Radeon R9 M265X. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 53800 (234%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 9800 GX2 is superior to the Radeon R9 M265X, by a large margin. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 10000 (109%)

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 maximum amount of data (measured in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the 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 clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.