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GeForce GT 320 vs Radeon HD 4650 1GB

Intro

The GeForce GT 320 uses a 40 nm design. nVidia has set the core speed at 540 MHz. The GDDR3 memory is set to run at a frequency of 790 MHz on this specific card. It features 72 SPUs as well as 24 Texture Address Units and 8 ROPs.

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320 43 Watts
Radeon HD 4650 1GB 55 Watts
Difference: 12 Watts (28%)

Memory Bandwidth

As far as performance goes, the GeForce GT 320 should theoretically be a bit better than the Radeon HD 4650 1GB overall. (explain)

GeForce GT 320 25280 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 2880 (13%)

Texel Rate

The Radeon HD 4650 1GB should be much (more or less 48%) faster with regards to texture filtering than the GeForce GT 320. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
GeForce GT 320 12960 Mtexels/sec
Difference: 6240 (48%)

Pixel Rate

The Radeon HD 4650 1GB should be a little bit (about 11%) better at AA than the GeForce GT 320, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4650 1GB 4800 Mpixels/sec
GeForce GT 320 4320 Mpixels/sec
Difference: 480 (11%)

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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GeForce GT 320

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 GeForce GT 320 Radeon HD 4650 1GB
Manufacturer nVidia AMD
Year February 2010 Sep 10, 2008
Code Name GT215 RV730 PRO
Memory 1024 MB 1024 MB
Core Speed 540 MHz 600 MHz
Memory Speed 1580 MHz 1400 MHz
Power (Max TDP) 43 watts 55 watts
Bandwidth 25280 MB/sec 22400 MB/sec
Texel Rate 12960 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 72 320(64x5)
Texture Mapping Units 24 32
Render Output Units 8 8
Bus Type GDDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 55 nm
Transistors 727 million 514 million
Bus PCIe x16 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.3 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce GT 320

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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