Q6 VTT Voltage radically fluctuates more than .35-.5+V and constant lockups when not overclocked.
Here is a pic of how to check if your mobo may be affected:
You should be looking to see if your mobo is Revision 1.1, Version 0.41
Response from Abit UK:
Solutions:We are aware of a problem with BP6s running two CPUs.
This problem only applies to assembly revision 1.1, board version 0.41 mainboards that have a Unisem produced regulator at location Q6 and a 100uF capacitor at location EC10.
The board version can be found on the underside of the board, by the keyboard/mouse socket ... If you are competent to modify the board yourself (or know someone who is), then all that is required is to replace the EC10 capacitor with one, value 1500uF/6.3v.
1. Contact Abit and see about getting a replacement (RMA).
2. Contact the store you bought it from and get an RMA.
3. Buy a $2 part from Radio Shack and fix it yourself.
4. Replace the EC10 capacitor with one, value 1500uF/6.3v. Clicke here for a howto. (recommended over the VTT fix)
1. The VTT mod or EC10 mod will immediately void your warranty on your mobo.
2. You may burn your fingers.
3. You might not need to do this mod at all, and may end up killing your mobo.
Now that that is out of the way, I bring to you the info I acquired from a fellow BP6 user that performed the Q6 mod successfully. This mod was originally thought up by somethingburning. BP6.Com assumes no responsibility for any damage caused by performing this solution. Thanks to Weaser for the pics and information.
The first picture is before....you can see the Q6
regulator to the left and a little above center it has US1050 on it. All I did was cut the legs on it (interesting note, when I did the plastic on the chip cracked...not usually a sign of high quality). Then solder my radio shack lm317t (which is rs part number 276-1778, costs $1.99 plus tax) right on top of the old one. It is very hard to solder, due to the close placement of one of the coils. Pin 2 of the original chip is not connected to the board, but the tab on back (which is connected to pin 2) is solder to the board . So you have to bend the middle pin on your new part back and solder to the tab. It does work for me....VTT variation went from 1.35-1.70 (0.35V swing) down to 1.47-1.52 (0.05V swing). Hope this helps. The second picture of course is after.
Here is another angle of the Unisem Voltage regulator removed and replaced with the Radio Shack version: