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Radeon HD 3650 512MB vs Radeon HD 4650 1GB

Intro

The Radeon HD 3650 512MB has a clock frequency of 725 MHz and a GDDR3 memory frequency of 800 MHz. It also features a 128-bit bus, and makes use of a 55 nm design. It is made up of 120(24x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare those specifications to the Radeon HD 4650 1GB, which comes with a GPU core clock speed of 600 MHz, and 1024 MB of GDDR3 memory set to run at 700 MHz through a 128-bit bus. It also is comprised of 320(64x5) Stream Processors, 32 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB 55 Watts
Radeon HD 3650 512MB 78 Watts
Difference: 23 Watts (42%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3650 512MB will be 14% quicker than the Radeon HD 4650 1GB in general, because of its greater data rate. (explain)

Radeon HD 3650 512MB 25600 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 3200 (14%)

Texel Rate

The Radeon HD 4650 1GB should be quite a bit (about 231%) faster with regards to texture filtering than the Radeon HD 3650 512MB. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
Radeon HD 3650 512MB 5800 Mtexels/sec
Difference: 13400 (231%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4650 1GB is a better choice, by a large margin. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
Radeon HD 3650 512MB 2900 Mpixels/sec
Difference: 1900 (66%)

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 3650 512MB

Amazon.com

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Radeon HD 4650 1GB

Amazon.com

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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 3650 512MB Radeon HD 4650 1GB
Manufacturer AMD AMD
Year 2008 Sep 10, 2008
Code Name RV635 PRO RV730 PRO
Memory 512 MB 1024 MB
Core Speed 725 MHz 600 MHz
Memory Speed 1600 MHz 1400 MHz
Power (Max TDP) 78 watts 55 watts
Bandwidth 25600 MB/sec 22400 MB/sec
Texel Rate 5800 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 2900 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 120(24x5) 320(64x5)
Texture Mapping Units 8 32
Render Output Units 4 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/AGP 8x PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card 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 Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 3650 512MB

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.

Comments

One Response to “Radeon HD 3650 512MB vs Radeon HD 4650 1GB”
Hd4650 wrew | Firstchoiceloc says:

[...] Radeon HD 3650 512MB vs Radeon HD 4650 1GB – Hwcompare.comCompare that to the Radeon HD 4650 1GB, which comes with a core clock … the results were calculated based on the card’s specifications, and real-world … [...]

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