Radeon HD 4750 vs Radeon R9 M290X

Intro

Compare all of that to the Radeon R9 M290X, which comes with a clock speed of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It is made up of 1280 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon R9 M290X		100 Watts
	Difference: 25 Watts (33%)

Memory Bandwidth

The Radeon R9 M290X, in theory, should be much faster than the Radeon HD 4750 overall. (explain)

Radeon R9 M290X		153600 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 102400 (200%)

Texel Rate

The Radeon R9 M290X will be much (more or less 191%) more effective at texture filtering than the Radeon HD 4750. (explain)

Radeon R9 M290X		68000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 44640 (191%)

Pixel Rate

The Radeon R9 M290X should be quite a bit (more or less 133%) better at full screen anti-aliasing than the Radeon HD 4750, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon R9 M290X		27200 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 15520 (133%)

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 max amount of information (in units of MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it must 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.