Ok, I just tested this out on my own system and I perfected the vbios. This one is the very last one you should have to run... https://www.mediafire.com/?v1icj2fw2as6cbh

Sajin
https://www.mediafire.com/?04dr4uje466gie5
 
Test that one

 
This one caused crashes when ever I ran it at windows with Internet explorer every now and then and it was rare. Also it would happen when I ran at these clock speeds. Around the 800 MHz range as you can see in the photo. One last thing. It would crash in a game randomly at at high loads. It was kind of to random for me to determine exactly why.
 
 

Sajin
Ok, I just tested this out on my own system and I perfected the vbios. This one is the very last one you should have to run... https://www.mediafire.com/?v1icj2fw2as6cbh

 
About to load this bios now wish me luck

If you continue to get crashes with 355.82 & the latest vbios try installing driver 353.62. If you continue to get crashes on 353.62 then the overclock is most likely still too high and will need to be reduced again.

So this happens at some heavy load in games and seems more unstable then the last one I was using.... it hard locks and I have to reboot. I guess we can try 1420mhz and call it a day.

by the way I think 899mhz and 0.881v is a bit low voltage for that idle speed could this be the reason for the crashing?

899 @ 0.881 should be just fine.

 Let me test it a bit more and come back to you with this by tomorrow :) no need to worry about me right now. Got to test some drivers first

Ok. Here is the 1420 one when you're ready... https://www.mediafire.com/?xw10yg26i7oa179 

cdc-951

This pic just showed up for me. How high have you been pushing the memory?