Submit Benchmarks!

Submit SSD Benchmark
Submit GPU Benchmark

Compare any two graphics cards:
VS

GeForce GT 640 DDR3 vs GeForce GTX 650


Intro

The GeForce GT 640 DDR3 features a core clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is comprised of 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the GeForce GTX 650, which makes use of a 28 nm design. nVidia has set the core frequency at 1058 MHz. The GDDR5 memory works at a speed of 1250 MHz on this model. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 650 2270 points
GeForce GT 640 DDR3 1560 points
Difference: 710 (46%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 1 Watts (2%)

Memory Bandwidth

Performance-wise, the GeForce GTX 650 should in theory be quite a bit better than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 650 80000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 22976 (40%)

Texel Rate

The GeForce GTX 650 will be just a bit (about 18%) faster with regards to anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 650 33856 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 5056 (18%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 650 is a better choice, not by a very large margin though. (explain)

GeForce GTX 650 16928 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 2528 (18%)

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

GeForce GT 640 DDR3

GeForce GTX 650

Specifications

Display Specifications

Hide Specifications

Model GeForce GT 640 DDR3 GeForce GTX 650
Manufacturer nVidia nVidia
Year June 2012 September 2012
Code Name GK107 GK107
Memory 2048 MB 1024 MB
Core Speed 900 MHz 1058 MHz
Memory Speed 3564 MHz 5000 MHz
Power (Max TDP) 65 watts 64 watts
Bandwidth 57024 MB/sec 80000 MB/sec
Texel Rate 28800 Mtexels/sec 33856 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 16928 Mpixels/sec
Unified Shaders 384 384
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 1300 million 1300 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.0
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce GT 640 DDR3

GeForce GTX 650

Comments

3 Responses to “GeForce GT 640 DDR3 vs GeForce GTX 650”
RTh says:

woow... look @ the TDP

Johnny says:

Certainly going for the GTX 650 is a better choice if you are choosing between these two cards. Why to chhoose:
The higher bandwidth & GDDR5 bus (over the outdated DDR3 bus)
And even the Power consuption is lower in the GTX 650 with much better performance.
I have both cards.

Step 3 says:

I have both , the MSI GTX650 with 1gb ddr5 and an OEM HP GT640 with 4gb ddr3 . Passmark scores for the GTX650 is only 30 or so points higher then the GT640. BUT, I can use MSI's Afterburner to push the score to about 200 points higher then the stock out of the box settings. So overclocking the GTX yields greater results, but the stock settings are very similar between the two cards.
HOWEVER ! Both needed MORE power to achieve full performance. They both worked with the factory Dell 760 305w PSU, but both achieved much higher Passmark scores when a higher output PSU (Thermaltake 700w) was installed. Approx. 600 + - points higher, which is a HUGE improvement. This is not due to Dell limiting the PCI-E slots power, as the GT640 does not use a PCI-E power cable, as does the GTX650. The GT640 gets all of it's power through the PCI-E slot. So if you think you can run a GT640 with a lower powered PSU, you might miss out on a major part of the cards abilities. SO don't let the low TDP fool you, you still need a decent PSU to properly power these two cards to achieve their full potential. What the low TDP does allow, is the ability to use the cards with a smaller PSU to start off, which will let you determine if you are able to run the card fully with your current PSU. Don't assume you're getting all of it's capabilities, you'll need to run some benchmark tests and compare your cards score vs other average scores. If you are WAY off, you'll probably benefit with a PSU upgrade. This way, you can see if the PSU you have will get the job done before spending the coin on a larger PSU. To give an example, I still have the DEll supplied HD3450, which achieves approx. the same Passmark score as the GT640 when using the stock Dell PSU. The GT640 smokes the HD3450 when the larger PSU is installed.

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


*

WordPress Anti-Spam by WP-SpamShield


[X]
[X]