GeForce GTX 650 Ti vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which features a clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti		110 Watts
Radeon R9 M390X		125 Watts
	Difference: 15 Watts (14%)

Memory Bandwidth

In theory, the Radeon R9 M390X will be 85% faster than the GeForce GTX 650 Ti overall, due to its higher bandwidth. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTX 650 Ti		86400 MB/sec
	Difference: 73600 (85%)

Texel Rate

The Radeon R9 M390X should be quite a bit (approximately 56%) more effective at AF than the GeForce GTX 650 Ti. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 650 Ti		59392 Mtexels/sec
	Difference: 33152 (56%)

Pixel Rate

The Radeon R9 M390X is much (about 56%) faster with regards to anti-aliasing than the GeForce GTX 650 Ti, and also will be capable of handling higher resolutions better. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTX 650 Ti		14848 Mpixels/sec
	Difference: 8288 (56%)

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 data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better 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 maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.