Submit Benchmarks!

Submit SSD Benchmark
Submit GPU Benchmark

Compare any two graphics cards:
VS

GeForce GT 640 DDR3 vs Radeon HD 4830 1GB

Intro

The GeForce GT 640 DDR3 has a clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also features a 128-bit bus, and uses a 28 nm design. It features 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 4830 1GB, which comes with a GPU core clock speed of 575 MHz, and 1024 MB of GDDR4 memory running at 900 MHz through a 256-bit bus. It also is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 4830 1GB 95 Watts
Difference: 30 Watts (46%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 1GB will be 1% faster than the GeForce GT 640 DDR3 in general, due to its greater bandwidth. (explain)

Radeon HD 4830 1GB 57600 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 576 (1%)

Texel Rate

The GeForce GT 640 DDR3 is quite a bit (approximately 57%) better at AF than the Radeon HD 4830 1GB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 10400 (57%)

Pixel Rate

The GeForce GT 640 DDR3 should be quite a bit (about 57%) better at full screen anti-aliasing than the Radeon HD 4830 1GB, and will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 5200 (57%)

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 640 DDR3

Amazon.com

Check prices at:

Radeon HD 4830 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

Display Specifications

Hide Specifications

Model GeForce GT 640 DDR3 Radeon HD 4830 1GB
Manufacturer nVidia AMD
Year June 2012 Oct 21, 2008
Code Name GK107 RV770 LE
Memory 2048 MB 1024 MB
Core Speed 900 MHz 575 MHz
Memory Speed 3564 MHz 1800 MHz
Power (Max TDP) 65 watts 95 watts
Bandwidth 57024 MB/sec 57600 MB/sec
Texel Rate 28800 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 384 640(128x5)
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type DDR3 GDDR4
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 1300 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.2 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce GT 640 DDR3

Amazon.com

Check prices at:

Radeon HD 4830 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.

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