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Radeon R9 290X vs Radeon R9 M275X

Intro

The Radeon R9 290X uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this particular model. It features 2816 SPUs as well as 176 TAUs and 64 ROPs.

Compare all of that to the Radeon R9 M275X, which uses a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory works at a frequency of 1125 MHz on this card. It features 640 SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X 50 Watts
Radeon R9 290X 300 Watts
Difference: 250 Watts (500%)

Memory Bandwidth

The Radeon R9 290X, in theory, should be a lot faster than the Radeon R9 M275X overall. (explain)

Radeon R9 290X 320000 MB/sec
Radeon R9 M275X 72000 MB/sec
Difference: 248000 (344%)

Texel Rate

The Radeon R9 290X should be a lot (about 291%) more effective at anisotropic filtering than the Radeon R9 M275X. (explain)

Radeon R9 290X 140800 Mtexels/sec
Radeon R9 M275X 36000 Mtexels/sec
Difference: 104800 (291%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 290X is the winner, and very much so. (explain)

Radeon R9 290X 51200 Mpixels/sec
Radeon R9 M275X 14400 Mpixels/sec
Difference: 36800 (256%)

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

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Radeon R9 290X

Amazon.com

Check prices at:

Radeon R9 M275X

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon R9 290X Radeon R9 M275X
Manufacturer AMD AMD
Year October 2013 May 1 2014
Code Name Hawaii XT Venus XTX
Memory 4096 MB 2048 MB
Core Speed 800 MHz 900 MHz
Memory Speed 5000 MHz 4500 MHz
Power (Max TDP) 300 watts 50 watts
Bandwidth 320000 MB/sec 72000 MB/sec
Texel Rate 140800 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 51200 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 2816 640
Texture Mapping Units 176 40
Render Output Units 64 16
Bus Type GDDR5 GDDR5
Bus Width 512-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 6200 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.2 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory per 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon R9 290X

Amazon.com

Check prices at:

Radeon R9 M275X

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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