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Radeon HD 3850 512MB vs Radeon HD 4850 2GB

Intro

The Radeon HD 3850 512MB features core clock speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 4850 2GB, which has a clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also uses a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
Radeon HD 4850 2GB 110 Watts
Difference: 35 Watts (47%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 2GB should perform a bit faster than the Radeon HD 3850 512MB overall. (explain)

Radeon HD 4850 2GB 63552 MB/sec
Radeon HD 3850 512MB 52992 MB/sec
Difference: 10560 (20%)

Texel Rate

The Radeon HD 4850 2GB is quite a bit (approximately 134%) faster with regards to AF than the Radeon HD 3850 512MB. (explain)

Radeon HD 4850 2GB 25000 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 14312 (134%)

Pixel Rate

The Radeon HD 3850 512MB is just a bit (approximately 7%) faster with regards to full screen anti-aliasing than the Radeon HD 4850 2GB, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 3850 512MB 10688 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 688 (7%)

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 512MB

Amazon.com

Check prices at:

Radeon HD 4850 2GB

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 512MB Radeon HD 4850 2GB
Manufacturer AMD AMD
Year Nov 19, 2007 Jun 25, 2008
Code Name RV670 PRO RV770 PRO
Memory 512 MB 2048 MB
Core Speed 668 MHz 625 MHz
Memory Speed 1656 MHz 1986 MHz
Power (Max TDP) 75 watts 110 watts
Bandwidth 52992 MB/sec 63552 MB/sec
Texel Rate 10688 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 320(64x5) 800(160x5)
Texture Mapping Units 16 40
Render Output Units 16 16
Bus Type GDDR3 GDDR4
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 956 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 information (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units of the card 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3850 512MB

Amazon.com

Check prices at:

Radeon HD 4850 2GB

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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