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Radeon HD 4750 vs Radeon R9 390X 8G

Intro

The Radeon HD 4750 makes use of a 40 nm design. AMD has set the core frequency at 730 MHz. The GDDR5 memory works at a frequency of 800 MHz on this specific card. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon R9 390X 8G, which makes use of a 28 nm design. AMD has clocked the core frequency at 1050 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this model. It features 2816 SPUs as well as 176 TAUs and 64 Rasterization Operator Units.

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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

Theoretically speaking, the Radeon R9 390X 8G should be 650% faster than the Radeon HD 4750 overall, because of its higher data rate. (explain)

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

Texel Rate

The Radeon R9 390X 8G should be a lot (about 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

If using a high screen resolution is important to you, then the Radeon R9 390X 8G is superior to the Radeon HD 4750, and very much so. (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: Memory bandwidth is the max amount of information (measured in MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 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 amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units 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 applied in one second.

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