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Radeon HD 3850 1GB vs Radeon HD 4750

Intro

The Radeon HD 3850 1GB features a GPU core clock speed of 668 MHz, and the 1024 MB of GDDR3 memory is set to run at 828 MHz through a 256-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 4750, which has a core clock speed of 730 MHz and a GDDR5 memory frequency of 800 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The Radeon HD 3850 1GB should theoretically perform a bit faster than 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 quite a bit (about 119%) more effective at AF 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

The Radeon HD 4750 will be a small bit (approximately 9%) better at anti-aliasing than the Radeon HD 3850 1GB, and also will be able to handle higher resolutions without losing too much performance. (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 largest amount of data (in units of MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

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