Radeon HD 7770 vs Radeon R9 M295X

Intro

Compare that to the Radeon R9 M295X, which has a clock speed of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 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 M295X		125 Watts
	Difference: 45 Watts (56%)

Memory Bandwidth

In theory, the Radeon R9 M295X should be 144% quicker than the Radeon HD 7770 overall, because of its greater data rate. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 104000 (144%)

Texel Rate

The Radeon R9 M295X will be much (approximately 140%) better at AF than the Radeon HD 7770. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 56000 (140%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M295X is superior to the Radeon HD 7770, and very much so. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 8000 (50%)

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 largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 are processed in one second. This figure is worked out by multiplying the total texture units of the card by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.