Radeon HD 4890 1GB vs Radeon R9 M295X

Intro

Compare those specifications to the Radeon R9 M295X, which features GPU clock speed of 750 MHz, and 4096 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

Performance-wise, the Radeon R9 M295X should theoretically be a lot superior to the Radeon HD 4890 1GB in general. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 51200 (41%)

Texel Rate

The Radeon R9 M295X should be much (approximately 140%) more effective at anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 56000 (140%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M295X is the winner, by a large margin. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 4890 1GB		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: Bandwidth is the maximum amount of data (counted in MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.