Radeon HD 7770 vs Radeon R9 M290X

Intro

Compare all of that to the Radeon R9 M290X, which makes use of a 28 nm design. AMD has set the core frequency at 850 MHz. The GDDR5 RAM is set to run at a frequency of 1200 MHz on this specific card. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon R9 M290X		100 Watts
	Difference: 20 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M290X is 113% faster than the Radeon HD 7770 in general, due to its higher data rate. (explain)

Radeon R9 M290X		153600 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 81600 (113%)

Texel Rate

The Radeon R9 M290X should be a lot (about 70%) faster with regards to anisotropic filtering than the Radeon HD 7770. (explain)

Radeon R9 M290X		68000 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 28000 (70%)

Pixel Rate

The Radeon R9 M290X will be quite a bit (about 70%) more effective at full screen anti-aliasing than the Radeon HD 7770, and should be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 M290X		27200 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 11200 (70%)

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 MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.