Submit Benchmarks!

Submit SSD Benchmark
Submit GPU Benchmark

Compare any two graphics cards:
VS

GeForce GT 640 DDR3 vs Radeon HD 4770

Intro

The GeForce GT 640 DDR3 features core clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon HD 4770, which has a core clock speed of 750 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is made up 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 4770 80 Watts
Difference: 15 Watts (23%)

Memory Bandwidth

Theoretically, the GeForce GT 640 DDR3 should be just a bit faster than the Radeon HD 4770 overall. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 5824 (11%)

Texel Rate

The GeForce GT 640 DDR3 will be a small bit (more or less 20%) better at texture filtering than the Radeon HD 4770. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 4800 (20%)

Pixel Rate

The GeForce GT 640 DDR3 will be just a bit (approximately 20%) faster with regards to full screen anti-aliasing than the Radeon HD 4770, and capable of handling higher resolutions while still performing well. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 2400 (20%)

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 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

Display Specifications

Hide Specifications

Model GeForce GT 640 DDR3 Radeon HD 4770
Manufacturer nVidia AMD
Year June 2012 Apr 28, 2009
Code Name GK107 RV740
Memory 2048 MB 512 MB
Core Speed 900 MHz 750 MHz
Memory Speed 3564 MHz 3200 MHz
Power (Max TDP) 65 watts 80 watts
Bandwidth 57024 MB/sec 51200 MB/sec
Texel Rate 28800 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 384 640(128x5)
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 826 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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GT 640 DDR3

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.

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