GeForce GTX 465 vs Radeon R9 390X 8G

Intro

Compare those specs to the Radeon R9 390X 8G, which features a clock speed of 1050 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 512-bit memory bus, and makes use of a 28 nm design. It features 2816 SPUs, 176 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 465		200 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 75 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390X 8G should be a lot faster than the GeForce GTX 465 overall. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 281408 (274%)

Texel Rate

The Radeon R9 390X 8G will be quite a bit (about 592%) faster with regards to anisotropic filtering than the GeForce GTX 465. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 158092 (592%)

Pixel Rate

The Radeon R9 390X 8G will be a lot (about 246%) better at AA than the GeForce GTX 465, and also should be able to handle higher resolutions better. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 47776 (246%)

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: Bandwidth is the max amount of information (counted in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics 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 number of pixels the video card could 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 Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.