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Radeon HD 3850 256MB vs Radeon HD 4750

Intro

The Radeon HD 3850 256MB makes use of a 55 nm design. AMD has set the core frequency at 668 MHz. The GDDR3 memory runs at a frequency of 828 MHz on this particular card. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare all that to the Radeon HD 4750, which has a clock speed of 730 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 256MB is 4% faster than the Radeon HD 4750 overall, because of its greater data rate. (explain)

Radeon HD 3850 256MB 52992 MB/sec
Radeon HD 4750 51200 MB/sec
Difference: 1792 (4%)

Texel Rate

The Radeon HD 4750 should be a lot (about 119%) more effective at AF than the Radeon HD 3850 256MB. (explain)

Radeon HD 4750 23360 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 12672 (119%)

Pixel Rate

The Radeon HD 4750 should be a small bit (more or less 9%) more effective at anti-aliasing than the Radeon HD 3850 256MB, and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4750 11680 Mpixels/sec
Radeon HD 3850 256MB 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 256MB

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 256MB Radeon HD 4750
Manufacturer AMD AMD
Year Nov 19, 2007
Code Name RV670 PRO RV740
Memory 256 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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill 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 max fill rate.

Display Prices

Hide Prices

Radeon HD 3850 256MB

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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