Radeon R9 290X vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which has GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

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

Theoretically speaking, the Radeon R9 290X should perform 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 is quite a bit (about 291%) better at AF than the Radeon R9 M275X. (explain)

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

Pixel Rate

The Radeon R9 290X should be a lot (approximately 256%) more effective at FSAA than the Radeon R9 M275X, and also able to handle higher screen resolutions without slowing down too much. (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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better 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 most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.