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GeForce GT 315 vs Radeon HD 4650 1GB

Intro

The GeForce GT 315 has a GPU clock speed of 625 MHz, and the 512 MB of DDR3 memory runs at 790 MHz through a 128-bit bus. It also is made up of 48 SPUs, 16 TAUs, and 8 Raster Operation Units.

Compare those specs to the Radeon HD 4650 1GB, which makes use of a 55 nm design. AMD has set the core speed at 600 MHz. The GDDR3 memory is set to run at a frequency of 700 MHz on this particular card. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315 52 Watts
Radeon HD 4650 1GB 55 Watts
Difference: 3 Watts (6%)

Memory Bandwidth

The GeForce GT 315, in theory, should be a bit faster than the Radeon HD 4650 1GB overall. (explain)

GeForce GT 315 25280 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 2880 (13%)

Texel Rate

The Radeon HD 4650 1GB is much (approximately 92%) better at texture filtering than the GeForce GT 315. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
GeForce GT 315 10000 Mtexels/sec
Difference: 9200 (92%)

Pixel Rate

The GeForce GT 315 is just a bit (more or less 4%) better at full screen anti-aliasing than the Radeon HD 4650 1GB, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GT 315 5000 Mpixels/sec
Radeon HD 4650 1GB 4800 Mpixels/sec
Difference: 200 (4%)

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 315

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 GeForce GT 315 Radeon HD 4650 1GB
Manufacturer nVidia AMD
Year November 2009 Sep 10, 2008
Code Name GT216 RV730 PRO
Memory 512 MB 1024 MB
Core Speed 625 MHz 600 MHz
Memory Speed 1580 MHz 1400 MHz
Power (Max TDP) 52 watts 55 watts
Bandwidth 25280 MB/sec 22400 MB/sec
Texel Rate 10000 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 5000 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 48 320(64x5)
Texture Mapping Units 16 32
Render Output Units 8 8
Bus Type DDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 55 nm
Transistors 486 million 514 million
Bus PCIe 2.0 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.2 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling 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 chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock 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 rate also depends on quite a few other factors, especially 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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GeForce GT 315

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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