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Radeon HD 3690/3830 vs Radeon HD 4650 1GB

Intro

The Radeon HD 3690/3830 makes use of a 55 nm design. AMD has set the core frequency at 668 MHz. The GDDR3 memory is set to run at a frequency of 828 MHz on this particular card. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 4650 1GB, which has GPU core speed of 600 MHz, and 1024 MB of GDDR3 memory running at 700 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB 55 Watts
Radeon HD 3690/3830 75 Watts
Difference: 20 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3690/3830 should perform just a bit faster than the Radeon HD 4650 1GB in general. (explain)

Radeon HD 3690/3830 26496 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 4096 (18%)

Texel Rate

The Radeon HD 4650 1GB will be quite a bit (about 80%) better at anisotropic filtering than the Radeon HD 3690/3830. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
Radeon HD 3690/3830 10688 Mtexels/sec
Difference: 8512 (80%)

Pixel Rate

The Radeon HD 3690/3830 should be a lot (approximately 123%) faster with regards to FSAA than the Radeon HD 4650 1GB, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 3690/3830 10688 Mpixels/sec
Radeon HD 4650 1GB 4800 Mpixels/sec
Difference: 5888 (123%)

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 3690/3830

Amazon.com

Check prices at:

Radeon HD 4650 1GB

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 3690/3830 Radeon HD 4650 1GB
Manufacturer AMD AMD
Year 2008 Sep 10, 2008
Code Name RV670 PRO RV730 PRO
Memory 256 MB 1024 MB
Core Speed 668 MHz 600 MHz
Memory Speed 1656 MHz 1400 MHz
Power (Max TDP) 75 watts 55 watts
Bandwidth 26496 MB/sec 22400 MB/sec
Texel Rate 10688 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 320(64x5) 320(64x5)
Texture Mapping Units 16 32
Render Output Units 16 8
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 514 million
Bus PCIe 2.0 x16 PCIe 2.0 x16, AGP 8x
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 information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 can be applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record 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 the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 3690/3830

Amazon.com

Check prices at:

Radeon HD 4650 1GB

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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