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GeForce GT 340 vs Radeon HD 4770

Intro

The GeForce GT 340 comes with a GPU clock speed of 550 MHz, and the 512 MB of GDDR5 RAM is set to run at 850 MHz through a 128-bit bus. It also is comprised of 96 SPUs, 32 TAUs, and 8 ROPs.

Compare those specs to the Radeon HD 4770, which features a GPU core clock speed of 750 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 69 Watts
Radeon HD 4770 80 Watts
Difference: 11 Watts (16%)

Memory Bandwidth

In theory, the GeForce GT 340 will be 6% quicker than the Radeon HD 4770 overall, due to its greater data rate. (explain)

GeForce GT 340 54400 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 3200 (6%)

Texel Rate

The Radeon HD 4770 should be much (more or less 36%) more effective at texture filtering than the GeForce GT 340. (explain)

Radeon HD 4770 24000 Mtexels/sec
GeForce GT 340 17600 Mtexels/sec
Difference: 6400 (36%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4770 is a better choice, by a large margin. (explain)

Radeon HD 4770 12000 Mpixels/sec
GeForce GT 340 4400 Mpixels/sec
Difference: 7600 (173%)

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 340

Amazon.com

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Radeon HD 4770

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 340 Radeon HD 4770
Manufacturer nVidia AMD
Year February 2010 Apr 28, 2009
Code Name GT215 RV740
Memory 512 MB 512 MB
Core Speed 550 MHz 750 MHz
Memory Speed 3400 MHz 3200 MHz
Power (Max TDP) 69 watts 80 watts
Bandwidth 54400 MB/sec 51200 MB/sec
Texel Rate 17600 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 96 640(128x5)
Texture Mapping Units 32 32
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 727 million 826 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.3 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 maximum amount of pixels that the graphics card can possibly write to its 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 the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 reach the maximum fill rate.

Display Prices

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GeForce GT 340

Amazon.com

Check prices at:

Radeon HD 4770

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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