first off....I am not a tech....I'm still learning.
Second, seems a bit sarcastic in the reply....not recommended.
Third: from what I have been told recently, it is faster to page 1 g or ram at 512 x 2 then to page 2 g of ram at 512 x 4. It is also faster to process 2 x 1g.
I have 4 x 512 on the same mobo. I am removing 1 g for now until I can buy 2 x 1 g sticks.
AMD 3700+ San Diego (no oc YET)
Asus A8N-Sli Premium
Asus 6800gt (trying to oc)
1 g Corsair DDR 400 (removed 2x512)
2 HDD Sata 160g, 200g
XP Home SP-2
Antec Sonata II Case
19\" Viewsonic LCD