Crossfire 7970 causes slow boot and disables Windows Aero.

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Nicolas Rudowski

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Mar 23, 2013
4
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10,510
Hello everyone,

when I boot my pc without activating Crossfire, everything just run fine but as soon as I enable crossfire, my pc takes more time at the "Please wait" screen before seing the dekstop, and Windows Aero is always disabled. Everything is updated and I'm sure this is the cause of these bugs. This is a fresh installation of Windows 7 64 bits.

Here is the rig :

Corsair HX1050w
Sabertooth Z77
i7-3770k@stock
2x4Gb Corsair Dominator@2133Mhz
2 Asus 7970 DirectCUII@stock
Single 1080p screen.

What do you think ? :(
 
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orionanomaly

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Dec 14, 2012
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I'm not sure why Aero would disable whilst only running a single monitor - I know from personal experience (and much frustration) that Aero disables when you run a lot of monitors (3+) because there is a set memory cache available in Windows (regardless of GPU) that gets tripped over.

You say that everything is updated and that this is the 'cause of these bugs' - are you saying that these issues were not present before you updated? If that's the case - you should consider rolling back the video drivers. If not...

I think you might need to provide a better history of the problem, and exactly what's happening - I'm not getting a good sense of what the problem is other than a slower boot time...
 
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Nicolas Rudowski

Honorable
Mar 23, 2013
4
0
10,510
Sorry, it was 4 a.m. when I wrote that.

So here is the issue :

When I boot my computer with Crossfire enabled, it takes a lot more time to boot. ( around 1min30 more time ) espacially at the "Please wait" screen.
Also, windows Aero and the sound are disabled too... it displays the message "Failed to connect to a Windows Service".

This problem was already present before I reinstalled Windows 7.

So yeah, I have a crossfire PC with windows 95 graphics, without sound and my mouse is starting to bug..

Any suggestions ? I tried to switch the video cards bios with the physical switch on the cards themselves and I already updated the BIOS of my MB before and after the Windows reinstallation. Please, answer me if you want further details.

Thanks.
 
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Nicolas Rudowski

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Mar 23, 2013
4
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10,510


I only flashed my motherboard to the lastest version (1805 on Sabertooth Z77). I didn't flashed the cards. Booting without crossfire is totally fine... I even switched the cards and this is always the crossfire that fails. I tried 2 different crossfire bridges and at the 2 differents slots ont the cards. Should I try to flash them ? If yes, on which position do I have to put the switches of the cards on ?

Thanks for your help.

P.S. : Note that I can run Battlefield 3 just fine with normal performances but It crashes every 15 minutes.
 
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Pinhedd

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Aug 7, 2007
10,342
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56,965


I don't see any firmware updates for the Asus 7970s, so that may not be the issue. Which slots do you have the 7970s plugged into? They must be plugged into the two 16x slots which are connected directly to the CPU, which are the first and second slots. If you have one connected to the 16x(4x mode) slot connected to the PCH all sorts of strange things can happen.
 
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Nicolas Rudowski

Honorable
Mar 23, 2013
4
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10,510


They are both on 8x / 8x in the two first slots :I
 
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