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Radeon HD 3850 1GB vs Radeon HD 4750

Intro

The Radeon HD 3850 1GB has a core clock frequency of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 4750, which has a clock frequency of 730 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

As far as performance goes, the Radeon HD 3850 1GB should theoretically be a small bit superior to the Radeon HD 4750 overall. (explain)

Radeon HD 3850 1GB 52992 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 1792 (4%)

Texel Rate

The Radeon HD 4750 is a lot (more or less 119%) better at texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 4750 23360 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 12672 (119%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4750 is a better choice, though not by far. (explain)

Radeon HD 4750 11680 Mpixels/sec
Radeon HD 3850 1GB 10688 Mpixels/sec
Difference: 992 (9%)

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 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4750

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 3850 1GB Radeon HD 4750
Manufacturer AMD AMD
Year Nov 19, 2007
Code Name RV670 PRO RV740
Memory 1024 MB 512 MB
Core Speed 668 MHz 730 MHz
Memory Speed 1656 MHz 3200 MHz
Power (Max TDP) 75 watts 75 watts
Bandwidth 52992 MB/sec 51200 MB/sec
Texel Rate 10688 Mtexels/sec 23360 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 11680 Mpixels/sec
Unified Shaders 320(64x5) 640(128x5)
Texture Mapping Units 16 32
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 826 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many 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.

Display Prices

Hide Prices

Radeon HD 3850 1GB

Amazon.com

Check prices at:

Radeon HD 4750

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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