How did you increase your ram sounds like you added 512mb stick, how many slots do you have and what makes up the previous 1gb of ram ,and are they matched sticks I'm not sure but having 1024mb in one channel and 512mb in the other channel might not be a good idea.
For the best dual-channel memory performance on motherboards with the Intel dualchannel
DDR chipsets, you must use identically paired memory modules in DIMM
sockets 0 of channel A and B. Identically paired memory modules must also be used
when populating DIMM sockets 1 of channel A and B. One can, for example, plug in
matching 256MB DIMMs in both DIMM 0 slots, and plug in matching 512MB DIMMs in
both DIMM 1 slots. Dual-channel memory performance is only realized when matched memory modules are
added in pairs, and installed in the correct socket configurations. Otherwise, a system
will revert to the lower-performing, single-channel memory mode. Cheers
Edited by sleepwalker, 23 November 2010 - 01:05 AM.