Radeon HD 4750 vs Radeon R9 270X

Intro

Compare those specs to the Radeon R9 270X, which features a clock frequency of 1000 MHz and a GDDR5 memory speed of 1400 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It is made up 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 270X		180 Watts
	Difference: 105 Watts (140%)

Memory Bandwidth

Performance-wise, the Radeon R9 270X should theoretically be a lot better than the Radeon HD 4750 overall. (explain)

Radeon R9 270X		179200 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 128000 (250%)

Texel Rate

The Radeon R9 270X should be a lot (approximately 242%) faster with regards to anisotropic filtering than the Radeon HD 4750. (explain)

Radeon R9 270X		80000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 56640 (242%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 270X is superior to the Radeon HD 4750, by a large margin. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 20320 (174%)

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 max amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could 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 the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.