ASRock P55 Extreme + Trident 16000CL9D-4GBTD @2000MHz issue

[J-Man]

When I first built my computer I bought 4GB of the Trident memory and used the XMP profile in my BIOS and was able to run them at 2000MHz no problems for 4 months straight. Just recently I decided to upgrade and get 4 more gigs of the same memory. Now when I try to run the XMP profile to 2000Mhz all I get is a black screen with my motherboard posting the 'd4' Dr. Debug error. According to my motherboards manual this error states "Test base 512k memory. Adjust polcies and cache first 8MB. Set Stack." Running through some tests I have been able to get the memory to post at 1600MHz with the timings at 9-9-9-24 and DRAM Voltage at 1.65V. I still havent been able to get my system stable with the full 8 gigs at 2000Mhz yet though. Can someone point me in the right direction on what my BIOS settings should be at?

Thanks


My Specs

ASRock P55 Extreme
Intel i7 860 @ 2.8GHz
GSkill Trident 8GB (4 x 2GB) 16000CL9D-4GBTD
Corsair CMPSU 650TX 650W
Sapphire Radeon HD 5850

[GSKILL TECH]

Raise the CPU VTT, memory controller voltage. It is struggling with the added stress of 4 modules at DDR3-2000.

Thank you
GSKILL TECH