Going from 4gb to 8gb.

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Yep, but you need to make several BIOS changes. If you want the settings then I need more info.

CPU: AMD Phenom II 955 BE

Q - What exact MOBO?
Q - What exact RAM? ; please provide a link of a screen shot of CPU-z SPD tab
 

InvalidError

Titan
Moderator

Before you shelf your 2x2GB, you could try running with 2x2GB + 2x4GB. If it works and passes overnight memtest86, you'll have 12GB instead of spare parts.
 
RAM: DDR3-1600 9-9-9-27 @ 1.65v ; since no Command Rate is listed you can try 1T and if problems in Memtest 2T. Most DDR3-1600 use 2 (same as 2, 2N, or 2T).
MOBO: GA-990XA-UD3
CPU: AMD Phenom II 955 BE (3.2GHz)

BIOS:
CPU NorthBridge Freq. -> 2400MHz
HT Link Frequency -> 2400MHz
Set Memory Clock -> 8 ; 8*200MHz = DDR3-1600
DRAM Configuration /Enter
1T/2T Command Timing -> Auto or 1T ; problems 2T
CAS# latency -> 9
RAS to CAS R/W Delay -> 9
Row Precharge Time -> 9
Minimum RAS Active Time -> 27

DRAM Voltage Control -> 1.65v or 1.64v (depends on menu)
CPU NB VID Control -> 1.20v

Save & Exit = Yes
 

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