GeForce GT 450 (OEM) vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which features clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2560 SPUs as well as 160 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon R9 390 8G		275 Watts
	Difference: 169 Watts (159%)

Memory Bandwidth

In theory, the Radeon R9 390 8G is 300% faster than the GeForce GT 450 (OEM) overall, because of its higher bandwidth. (explain)

Radeon R9 390 8G		384000 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 288000 (300%)

Texel Rate

The Radeon R9 390 8G will be much (about 744%) faster with regards to texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon R9 390 8G		160000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 141040 (744%)

Pixel Rate

The Radeon R9 390 8G will be much (about 238%) better at FSAA than the GeForce GT 450 (OEM), and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 45040 (238%)

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 largest amount of information (in units of MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, 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 high resolutions.

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

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