Well I bit the bullet and bought 2x1gb of Corsair value stuff and it is working nicely in dual channel. Running at 1T 2.5,3,3,7 and can get it to 220 with 2.7v. Did not want to mess with populating all 4 slots.
OT, BF2 runs so much better with 2gb. 1.5gb is much better than 1gb. 2gb is only a little better than 1.5gb.