GeForce GTX 650 Ti 2GB vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which features core speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 160 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 2GB		110 Watts
Radeon R9 390 8G		275 Watts
	Difference: 165 Watts (150%)

Memory Bandwidth

Performance-wise, the Radeon R9 390 8G should in theory be much superior to the GeForce GTX 650 Ti 2GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
GeForce GTX 650 Ti 2GB		86400 MB/sec
	Difference: 297600 (344%)

Texel Rate

The Radeon R9 390 8G is quite a bit (about 169%) faster with regards to texture filtering than the GeForce GTX 650 Ti 2GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
	Difference: 100608 (169%)

Pixel Rate

The Radeon R9 390 8G is much (about 331%) better at full screen anti-aliasing than the GeForce GTX 650 Ti 2GB, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
	Difference: 49152 (331%)

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 megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.