GeForce 9800 GTX+ vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which comes with GPU clock speed of 723 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce 9800 GTX+		145 Watts
	Difference: 20 Watts (16%)

Memory Bandwidth

In theory, the Radeon R9 M390X should be 127% faster than the GeForce 9800 GTX+ overall, because of its higher data rate. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce 9800 GTX+		70400 MB/sec
	Difference: 89600 (127%)

Texel Rate

The Radeon R9 M390X will be quite a bit (more or less 96%) better at texture filtering than the GeForce 9800 GTX+. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce 9800 GTX+		47232 Mtexels/sec
	Difference: 45312 (96%)

Pixel Rate

The Radeon R9 M390X will be much (more or less 96%) faster with regards to full screen anti-aliasing than the GeForce 9800 GTX+, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce 9800 GTX+		11808 Mpixels/sec
	Difference: 11328 (96%)

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 data (measured in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units of the card 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 that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.