Radeon HD 6770 1GB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon R9 M390X		125 Watts
	Difference: 17 Watts (16%)

Memory Bandwidth

The Radeon R9 M390X, in theory, should be much faster than the Radeon HD 6770 1GB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 92800 (138%)

Texel Rate

The Radeon R9 M390X is quite a bit (approximately 157%) better at texture filtering than the Radeon HD 6770 1GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 56544 (157%)

Pixel Rate

The Radeon R9 M390X should be a lot (approximately 61%) more effective at full screen anti-aliasing than the Radeon HD 6770 1GB, and should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 8736 (61%)

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 (measured in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. 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 quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.