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Answer» I have a Dell M4300 with dock and I would like to run 2 external displays and the laptop display.
Currently using external USB VGA device for the 2nd external display. I would like to know if I can run 1st Ex. display off the dock VGA PORT and 2nd Ex. display off the dock DVI-D Port?
If no, is it better to have external USB DVI-D device? My current USB VGA device is old and the resolution is poor on 21" display so I am thinking of upgrading.The refresh rate/quality of USB VGA devices are just about always poor.
They work ok for PRESENTATIONS showing a powerpoint slide etc, some may be cloudy while others sharper as was the case between 2 brands of devices we tried out, but are not for gaming or watching movies on etc if thats your intent for the multiple displays. I believe that this is due to the communication bottleneck of trying to run graphics on USB. It seems as the higher resolution makes quality even worse for refresh time etc so, it has to be a lag caused by communication latency.
Laptops with multiple displays for gaming etc dont work out so WELL most of the time even if just using a 2nd display connected to the available VGA port, if you want gaming on 3 displays you will want to go with a desktop computer with 2 video cards configured for 3 displays.
The last time I played around with a USB Video adapter, I tried to run a youtube video through it and it was lagging between video and audio response, and some videos would black screen and you would only get sound. And the integrated video of the laptop ran it all fine on the laptop display. Last place I worked at had some users NEEDED to show presentations with laptops that didnt have the VGA out port to attach a projector to, so we used this easy and cheap solution vs replacing a large quantity of laptops. It worked ok for that purpose, but nothing like videos or gaming.Thanks
The External VGA (USB2VGA) I have works as you describe. Graphically OK for work environment. A little cloudy but useable.
Will an external DVI (Startech USB2DVIPRO) work better? Quote from: DaveLembke on March 28, 2013, 12:12:52 PM \
Laptops with multiple displays for gaming etc dont work out so well most of the time even if just using a 2nd display connected to the available VGA port, if you want gaming on 3 displays you will want to go with a desktop computer with 2 video cards configured for 3 displays.
Maybe not for gaming, but for general productivity.
I have a Radeon 6770 on my desktop spitting out 3 displays (1 VGA, 1 DVI, 1 DisplayPort).
I had to buy a proprietary AMD DisplayPort to DVI adapater, but it works.
Quote from: DJ-macom on April 03, 2013, 06:02:52 AMThanks
The External VGA (USB2VGA) I have works as you describe. Graphically OK for work environment. A little cloudy but useable.
Will an external DVI (Startech USB2DVIPRO) work better?
The problem with using USB is the extremely data transfer rate. There is no way to 'squeeze' more data through USB with a DVI adapter.
Question... Why don't you run the second monitor through your laptop's built-in VGA port?Using Dell Laptop.
The laptop has VGA but no DVI port. Connect Laptop to Dock with both VGA and DVI ports. I can use either the dock VGA or Dock DVI port, but cannot operate both simultaneously. So I have added a USB VGA device to connect to the 3rd display while using the dock VGA for the 2nd display.
If I could operate the Dock VGA and DVI port simultaneously then I would be golden, but I do not THINK this is possible so I am doomed to add an external device.
The question is which is better?? Since both are limited by USB data rate, does it matter?Alright, gotcha.
I did some research, and apparently the USB to VGA adapter works better than USB to DVI.
The reviews stated that the refresh rate is faster, and the VGA adapter is considerably cheaper.
http://www.amazon.com/review/R39RBLQ8W4E9QO/ref=cm_cr_pr_perm?ie=UTF8&ASIN=B0071U0O1M&linkCode=&nodeID=&tag=Upgrade to USB2VGAE3 adapter with higher resolution. $55
Works much better worth the upgrade
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