Radeon HD 4750 vs Radeon R9 M290X

Intro

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

Display Graphs

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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

Theoretically, the Radeon R9 M290X should be much faster than the Radeon HD 4750 in general. (explain)

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

Texel Rate

The Radeon R9 M290X should be much (about 191%) faster with regards to 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 is quite a bit (approximately 133%) more effective at full screen anti-aliasing than the Radeon HD 4750, and also able to handle higher resolutions while still performing well. (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 largest amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.