Bitcoin Forum

Hi, I have 2x 5770s installed and they both show on the device manager.
Both are on PCI-E 16x slots I am using the EVGA 780i mb
It not mines on both but I cannot get them to both hit 200mhash each? One will dip while other climbs vise versa
Please help me, I will highly appreciate it.
The one to solve my problem, I will send a brand new coosh earphone as a reward. (us only though) =(

Do they both show up in CCC?
If not, I'd say driver reinstall!
And, disable CF!

For some reason GUIminer would not register my 2nd video card until I plugged it into something. Even with the 11.7 drivers, it had to have some type of connection or I couldn't pull it from the drop down menu, go figure.

Do you have monitors connected to both of them? They need to be connected to a monitor to be recognized.
You can make a dummy plug that simulates having a monitor plugged in with a spare DVI adapter and $1.59 in resistors from radio shack:

http://www.overclock.net/folding-home-guides-tutorials/384733-30-second-dummy-plug.html

The dummy plug solves all issues that you have just by placing the finished product on the videocards that you would like detected.If you have a HDMI to VGA plug you just require at least 3 resistors in order to complete the process.You can find out how to make a Multi-gpu setup here (http://www.youtube.com/watch?v=mtbfXg193do) which includes 2 cards and beyond where a "dummy plug" should allow detection of said hardware.

They also must be enabled as "extended desktop"!

alright I just did the dummy plug it shows but I cannot enable the display for it or am I supposed to reboot?

Yup, reboot.
You had some 68 Ω resistors kicking around?

Yes I did =) rebooting right now I hope it works! =p so will this work with the 1x to 16x too?

darn still no cigar rebooted I mean the displays to enable the screens actually show now but I can not enable them. The 2nd gpu does not show on guiminer still =(

You're not suppose to "enable" the display but have "extended desktop" enabled in order for it to be active by the miner of your choosing.The videocard connected to your monitor is the only one that would be responsible for your monitor being showcasing video not those that have a dummy plug exclusively.


If it isn't showcasing then resistors might not be pushed snuggly inside the HDMI to VGA adapter......try again and then plug it back in.If it STILL does not showcase then uninstall the drivers and re-install to have them recognize both cards.

man I tried to reinstall and it still does not show up on guiminer !!!

Try plugging your monitor into the other card, make sure its working?

What is your driver variant,OS and SDK installed ?

I don't think it is a hardware issue but simply a driver issue at this point.

catalyst 11.8
windows xp x64

your right my 2nd card shows no display on my monitor.

^That doesn't mean anything though,trust me.I only recently as of the last 2 weeks did a full agnostic w/ regards to XP and Multi-GPU mining.You will realize that the Catalayst 11.6b's are actually the best for XP right now w/SDK 2.5 !!!!

My motherboard also will not showcase on the second card simply because when doing a multi GPU solution it only recognizes the card in the main slot for a video signal....which I originally thought was a PSU issue.This is simply a detection issue by GUI miner.I would like to suggest the following.


1.Use driver sweeper to clean any ati files and do it twice up on reboot and use CCleaner to clean the registry on reboot twice.

2.Install Catalyst 11.6B for Windows XP 64 if possible and leave the latest SDK installed.

3.Download GUI miner yet again and see if it works.

just to make sure how do you exactly extend the desktop...

^^Right click on desktop-->Left click on Catalyst control center->Display Manager->Display Properties->"Desktop and Display Setup" You'll find multiple display options on the right to enable extended desktop.

alright that did it! but now with both running my mhash is pretty much like 1 was running.