GeForce GT 320 vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which has a GPU core 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 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon R9 M390X		125 Watts
	Difference: 82 Watts (191%)

Memory Bandwidth

The Radeon R9 M390X, in theory, should perform much faster than the GeForce GT 320 overall. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 134720 (533%)

Texel Rate

The Radeon R9 M390X should be quite a bit (about 614%) more effective at texture filtering than the GeForce GT 320. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 79584 (614%)

Pixel Rate

The Radeon R9 M390X is quite a bit (more or less 436%) better at AA than the GeForce GT 320, and also should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 18816 (436%)

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 (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses 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 amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core 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 - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.