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GeForce GT 320 vs Radeon HD 4650 1GB

Intro

The GeForce GT 320 features a clock frequency of 540 MHz and a GDDR3 memory speed of 790 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It features 72 SPUs, 24 Texture Address Units, and 8 ROPs.

Compare those specs to the Radeon HD 4650 1GB, which comes with a core clock speed of 600 MHz and a GDDR3 memory speed of 700 MHz. It also features a 128-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

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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

Performance-wise, the GeForce GT 320 should in theory be a bit better than the Radeon HD 4650 1GB in general. (explain)

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

Texel Rate

The Radeon HD 4650 1GB will be much (about 48%) faster with regards to AF than the GeForce GT 320. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4650 1GB is a better choice, though only just barely. (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: Memory bandwidth is the max amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels 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 figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends 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 max fill rate.

Display Prices

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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.

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