Radeon HD 4750 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which has core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon R9 M390X		125 Watts
	Difference: 50 Watts (67%)

Memory Bandwidth

In theory, the Radeon R9 M390X should perform quite a bit faster than the Radeon HD 4750 in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 108800 (213%)

Texel Rate

The Radeon R9 M390X will be quite a bit (about 296%) better at AF than the Radeon HD 4750. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 69184 (296%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 M390X is a better choice, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 11456 (98%)

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 across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.