Compare any two graphics cards:
VS

Radeon HD 3850 256MB vs Radeon HD 4770

Intro

The Radeon HD 3850 256MB features a GPU core speed of 668 MHz, and the 256 MB of GDDR3 RAM is set to run at 828 MHz through a 256-bit bus. It also is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon HD 4770, which features a core clock speed of 750 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
Radeon HD 4770 80 Watts
Difference: 5 Watts (7%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 256MB should perform a small bit faster than the Radeon HD 4770 overall. (explain)

Radeon HD 3850 256MB 52992 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 1792 (4%)

Texel Rate

The Radeon HD 4770 will be quite a bit (more or less 125%) more effective at anisotropic filtering than the Radeon HD 3850 256MB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 13312 (125%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4770 is superior to the Radeon HD 3850 256MB, not by a very large margin though. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 3850 256MB 10688 Mpixels/sec
Difference: 1312 (12%)

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

Display Prices

Hide Prices

Radeon HD 3850 256MB

Amazon.com

Check prices at:

Radeon HD 4770

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

Display Specifications

Hide Specifications

Model Radeon HD 3850 256MB Radeon HD 4770
Manufacturer AMD AMD
Year Nov 19, 2007 Apr 28, 2009
Code Name RV670 PRO RV740
Memory 256 MB 512 MB
Core Speed 668 MHz 750 MHz
Memory Speed 1656 MHz 3200 MHz
Power (Max TDP) 75 watts 80 watts
Bandwidth 52992 MB/sec 51200 MB/sec
Texel Rate 10688 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 12000 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 max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines 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 fill rate is also dependant on quite a few 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 4770

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.

Comments

Be the first to leave a comment!

Your email address will not be published. Required fields are marked *


*

WordPress Anti Spam by WP-SpamShield