If it shows single channel and you have 2 sticks, then you have one of the sticks in the wrong slot. If you read your mobo manual it explains this. Use like colors.
333mhz x 2 (ddr2) means your memory is running at 667mhz, not 800mhz. If you want it to run at 800mhz, you need to set it to 400mhz (x2 (ddr2)
My mother board only has two memory slots...
And really if you had read my op you would have NOTICED! "That I can't change any settings for the memory other than the latency..."
MY memory timings are email@example.com