Geforce GTX 770 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which has GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Geforce GTX 770		230 Watts
	Difference: 105 Watts (84%)

Memory Bandwidth

The Geforce GTX 770, in theory, should be much faster than the Radeon R9 M390X in general. (explain)

Geforce GTX 770		224384 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 64384 (40%)

Texel Rate

The Geforce GTX 770 is quite a bit (approximately 45%) faster with regards to AF than the Radeon R9 M390X. (explain)

Geforce GTX 770		133888 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 41344 (45%)

Pixel Rate

If using high levels of AA is important to you, then the Geforce GTX 770 is superior to the Radeon R9 M390X, and very much so. (explain)

Geforce GTX 770		33472 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 10336 (45%)

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 data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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 bandwidth is, the lower the potential to get to the max fill rate.