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Radeon HD 4650 1GB vs Radeon HD 6450 (OEM)

Intro

The Radeon HD 4650 1GB comes with a clock speed of 600 MHz and a GDDR3 memory frequency of 700 MHz. It also uses a 128-bit memory bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Compare that to the Radeon HD 6450 (OEM), which uses a 40 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR3 RAM is set to run at a frequency of 800 MHz on this card. It features 160 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 31 Watts
Radeon HD 4650 1GB 55 Watts
Difference: 24 Watts (77%)

Memory Bandwidth

Performance-wise, the Radeon HD 4650 1GB should in theory be a lot better than the Radeon HD 6450 (OEM) in general. (explain)

Radeon HD 4650 1GB 22400 MB/sec
Radeon HD 6450 (OEM) 12800 MB/sec
Difference: 9600 (75%)

Texel Rate

The Radeon HD 4650 1GB should be much (about 284%) more effective at texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
Radeon HD 6450 (OEM) 5000 Mtexels/sec
Difference: 14200 (284%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4650 1GB is superior to the Radeon HD 6450 (OEM), by far. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
Radeon HD 6450 (OEM) 2500 Mpixels/sec
Difference: 2300 (92%)

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 4650 1GB

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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 4650 1GB Radeon HD 6450 (OEM)
Manufacturer AMD AMD
Year Sep 10, 2008 February 2011
Code Name RV730 PRO Caicos
Memory 1024 MB 512 MB
Core Speed 600 MHz 625 MHz
Memory Speed 1400 MHz 1600 MHz
Power (Max TDP) 55 watts 31 watts
Bandwidth 22400 MB/sec 12800 MB/sec
Texel Rate 19200 Mtexels/sec 5000 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 2500 Mpixels/sec
Unified Shaders 320(64x5) 160
Texture Mapping Units 32 8
Render Output Units 8 4
Bus Type GDDR3 GDDR3
Bus Width 128-bit 64-bit
Fab Process 55 nm 40 nm
Transistors 514 million 370 million
Bus PCIe 2.0 x16, AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the 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 most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4650 1GB

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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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