Aero deactivates when more then 3 monitors are being run off a single GPU card - I've tried essentially everything reasonable to fix it (restore Aero effects to the desktop), but I have come to conclude that the issue is NOT:
1. Driver related (I have tried Windows and various iterations of AMD's drivers (I have a HD6990 GPU).
2. GPU memory related - my GPU has 2GB of memory running for both cores - even though I'm running a LARGE surface area of pixels with 4 monitors, this is within spec for the card, and regardless, shouldn't stress it at all. Other graphics intensive applications run fine.
3. CPU related - my CPU is clocked to 3.3GHz Core i7 975EE.
4. Program related - I've run clean installs of Windows and replicated the effects of Aero deactivating.
--
Recently I discovered that this is actually fairly common:
http://answers.microsoft.com/en-us/...asic-non/7f4917ff-135d-40e4-866b-ac760642763f
http://support.microsoft.com/kb/939423
--
One user I believe correctly identifies the problem - Windows constricts Aero to a certain amount of video memory by default; when it trips this amount of memory (say by running 4 large monitors) it simply turns Aero off, regardless of the amount of video memory available. (I was originally going to try to run another GPU, but according to people in the forum, this wasn't correcting the issue, pointing to a Win7 issue)
Whether or not this can be modified (some regedits are listed in the forums above), is unclear. Also, some users report Aero malfunctioning for other reasons which are acutely fixed.
As it stands, I have come to accept that this is a fundamental flaw of Windows 7 when it comes to multiple monitors (None of the OSes in my exp. really support multi-monitor as well as they should given its commonality these days).
--
For those experiencing the issue, but annoyed by the lack of Win7 'chrome' in the GUI - perhaps Rainmeter, the custom desktop app, might alleviate your need for things transparent and shiny...
http://rainmeter.net/cms/
So, while this isn't a solution per se, it is a conclusion that I think it's pointless to try to fix this.
1. Driver related (I have tried Windows and various iterations of AMD's drivers (I have a HD6990 GPU).
2. GPU memory related - my GPU has 2GB of memory running for both cores - even though I'm running a LARGE surface area of pixels with 4 monitors, this is within spec for the card, and regardless, shouldn't stress it at all. Other graphics intensive applications run fine.
3. CPU related - my CPU is clocked to 3.3GHz Core i7 975EE.
4. Program related - I've run clean installs of Windows and replicated the effects of Aero deactivating.
--
Recently I discovered that this is actually fairly common:
http://answers.microsoft.com/en-us/...asic-non/7f4917ff-135d-40e4-866b-ac760642763f
http://support.microsoft.com/kb/939423
--
One user I believe correctly identifies the problem - Windows constricts Aero to a certain amount of video memory by default; when it trips this amount of memory (say by running 4 large monitors) it simply turns Aero off, regardless of the amount of video memory available. (I was originally going to try to run another GPU, but according to people in the forum, this wasn't correcting the issue, pointing to a Win7 issue)
Whether or not this can be modified (some regedits are listed in the forums above), is unclear. Also, some users report Aero malfunctioning for other reasons which are acutely fixed.
As it stands, I have come to accept that this is a fundamental flaw of Windows 7 when it comes to multiple monitors (None of the OSes in my exp. really support multi-monitor as well as they should given its commonality these days).
--
For those experiencing the issue, but annoyed by the lack of Win7 'chrome' in the GUI - perhaps Rainmeter, the custom desktop app, might alleviate your need for things transparent and shiny...
http://rainmeter.net/cms/
So, while this isn't a solution per se, it is a conclusion that I think it's pointless to try to fix this.