Submit Benchmarks!

Submit SSD Benchmark
Submit GPU Benchmark

Compare any two graphics cards:
VS

GeForce GT 640 DDR3 vs Radeon HD 3850 1GB

Intro

The GeForce GT 640 DDR3 uses a 28 nm design. nVidia has set the core frequency at 900 MHz. The DDR3 RAM is set to run at a frequency of 1782 MHz on this particular model. It features 384 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 3850 1GB, which comes with core clock speeds of 668 MHz on the GPU, and 828 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 3850 1GB 75 Watts
Difference: 10 Watts (15%)

Memory Bandwidth

Performance-wise, the GeForce GT 640 DDR3 should in theory be a bit superior to the Radeon HD 3850 1GB in general. (explain)

GeForce GT 640 DDR3 57024 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 4032 (8%)

Texel Rate

The GeForce GT 640 DDR3 should be a lot (more or less 169%) more effective at texture filtering than the Radeon HD 3850 1GB. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 18112 (169%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GT 640 DDR3 is a better choice, by far. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 3850 1GB 10688 Mpixels/sec
Difference: 3712 (35%)

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 3850 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 3850 1GB
Manufacturer nVidia AMD
Year June 2012 Nov 19, 2007
Code Name GK107 RV670 PRO
Memory 2048 MB 1024 MB
Core Speed 900 MHz 668 MHz
Memory Speed 3564 MHz 1656 MHz
Power (Max TDP) 65 watts 75 watts
Bandwidth 57024 MB/sec 52992 MB/sec
Texel Rate 28800 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 10688 Mpixels/sec
Unified Shaders 384 320(64x5)
Texture Mapping Units 32 16
Render Output Units 16 16
Bus Type DDR3 GDDR3
Bus Width 128-bit 256-bit
Fab Process 28 nm 55 nm
Transistors 1300 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.2 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, 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 figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 is also dependant 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 640 DDR3

Amazon.com

Check prices at:

Radeon HD 3850 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