Radeon HD 7770 vs Radeon R9 M280X

Intro

Compare all of that to the Radeon R9 M280X, which uses a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory runs at a frequency of 1375 MHz on this card. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
Radeon HD 7770		80 Watts
	Difference: 5 Watts (7%)

Memory Bandwidth

In theory, the Radeon R9 M280X should be much faster than the Radeon HD 7770 in general. (explain)

Radeon R9 M280X		88000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 16000 (22%)

Texel Rate

The Radeon R9 M280X will be much (approximately 26%) faster with regards to AF than the Radeon HD 7770. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 10400 (26%)

Pixel Rate

The Radeon HD 7770 should be a little bit (about 11%) more effective at anti-aliasing than the Radeon R9 M280X, and will be able to handle higher screen resolutions better. (explain)

Radeon HD 7770		16000 Mpixels/sec
Radeon R9 M280X		14400 Mpixels/sec
	Difference: 1600 (11%)

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 maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is calculated 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.