Submit Benchmarks!

Submit SSD Benchmark
Submit GPU Benchmark

Compare any two graphics cards:
VS

GeForce GT 340 vs GeForce GT 640 DDR3

Intro

The GeForce GT 340 has clock speeds of 550 MHz on the GPU, and 850 MHz on the 512 MB of GDDR5 RAM. It features 96 SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Compare all of that to the GeForce GT 640 DDR3, which features GPU core speed of 900 MHz, and 2048 MB of DDR3 RAM running at 1782 MHz through a 128-bit bus. It also is comprised of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GT 340 69 Watts
Difference: 4 Watts (6%)

Memory Bandwidth

The GeForce GT 640 DDR3 should in theory be just a bit faster than the GeForce GT 340 in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce GT 340 54400 MB/sec
Difference: 2624 (5%)

Texel Rate

The GeForce GT 640 DDR3 should be much (approximately 64%) better at AF than the GeForce GT 340. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce GT 340 17600 Mtexels/sec
Difference: 11200 (64%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 640 DDR3 is a better choice, by a large margin. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GT 340 4400 Mpixels/sec
Difference: 10000 (227%)

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

Display Prices

Hide Prices

GeForce GT 340

Amazon.com

Check prices at:

GeForce GT 640 DDR3

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

Display Specifications

Hide Specifications

Model GeForce GT 340 GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year February 2010 June 2012
Code Name GT215 GK107
Memory 512 MB 2048 MB
Core Speed 550 MHz 900 MHz
Memory Speed 3400 MHz 3564 MHz
Power (Max TDP) 69 watts 65 watts
Bandwidth 54400 MB/sec 57024 MB/sec
Texel Rate 17600 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 96 384
Texture Mapping Units 32 32
Render Output Units 8 16
Bus Type GDDR5 DDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 727 million 1300 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.0
OpenGL Version OpenGL 3.3 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's interface 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 bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to 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 memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce GT 340

Amazon.com

Check prices at:

GeForce GT 640 DDR3

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.

Comments

Be the first to leave a comment!

Your email address will not be published. Required fields are marked *


*

WordPress Anti Spam by WP-SpamShield