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Radeon HD 4750 vs Radeon R9 390X 8G

Intro

The Radeon HD 4750 features a GPU core speed of 730 MHz, and the 512 MB of GDDR5 memory runs at 800 MHz through a 128-bit bus. It also features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon R9 390X 8G, which comes with GPU core speed of 1050 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also is made up of 2816 Stream Processors, 176 TAUs, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750 75 Watts
Radeon R9 390X 8G 275 Watts
Difference: 200 Watts (267%)

Memory Bandwidth

The Radeon R9 390X 8G should theoretically be quite a bit faster than the Radeon HD 4750 in general. (explain)

Radeon R9 390X 8G 384000 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 332800 (650%)

Texel Rate

The Radeon R9 390X 8G is much (approximately 691%) faster with regards to AF than the Radeon HD 4750. (explain)

Radeon R9 390X 8G 184800 Mtexels/sec
Radeon HD 4750 23360 Mtexels/sec
Difference: 161440 (691%)

Pixel Rate

The Radeon R9 390X 8G should be much (more or less 475%) more effective at anti-aliasing than the Radeon HD 4750, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 390X 8G 67200 Mpixels/sec
Radeon HD 4750 11680 Mpixels/sec
Difference: 55520 (475%)

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

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Radeon HD 4750

Amazon.com

Check prices at:

Radeon R9 390X 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 4750 Radeon R9 390X 8G
Manufacturer AMD AMD
Year June 2015
Code Name RV740 Grenada XT
Memory 512 MB 8192 MB
Core Speed 730 MHz 1050 MHz
Memory Speed 3200 MHz 6000 MHz
Power (Max TDP) 75 watts 275 watts
Bandwidth 51200 MB/sec 384000 MB/sec
Texel Rate 23360 Mtexels/sec 184800 Mtexels/sec
Pixel Rate 11680 Mpixels/sec 67200 Mpixels/sec
Unified Shaders 640(128x5) 2816
Texture Mapping Units 32 176
Render Output Units 16 64
Bus Type GDDR5 GDDR5
Bus Width 128-bit 512-bit
Fab Process 40 nm 28 nm
Transistors 826 million 6200 million
Bus PCIe 2.0 x16 PCIe 3.0 ×16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the video 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 most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4750

Amazon.com

Check prices at:

Radeon R9 390X 8G

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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