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

Intro

Compare that to the Radeon R9 390 8G, which has GPU core speed of 1000 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 TAUs, and 64 ROPs.

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 will be 300% faster than the GeForce GT 450 (OEM) overall, due to its higher data rate. (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 should be much (more or less 744%) more effective at AF 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 (more or less 238%) faster with regards to anti-aliasing than the GeForce GT 450 (OEM), and capable of handling higher screen resolutions without losing too much performance. (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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 are processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.