Problem running dual channel P7P55D LE

sgnl00

Distinguished
May 26, 2010
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18,510
Hey dudes, I'm having trouble running my 2x2GB RAM sticks in dual channel mode. Both RAM sticks aren't faulty, I can run them through single channel in slots A1 and B1 (4GB single channel). However, when trying to run them in dual channel through slots A1 and A2 for dual channel, they don't want to work (my PC only detects total memory as 2GB single channel). Leads me to believe that the memory slot A2 is borked. Anyone got ideas? Is it possible to set the motherboard to use B1 and B2 as default memory slots?

Specs:

Memory : KINGSTON KVR1333D3N9K2/4G (2X2GB)
Motherboard: Asus P7P55D LE
CPU: i5 750
GPU: Radeon 5770