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I would like to try to upgrade the ram in this tablet. I currently have 4 chips ( Hynix 526AA HY5DU121622BT-J ). This totals 512mb. 

Does anyone know how to go about this? I am familier with this type of solder rework and am willing to give this a try if anyone can help me out with how to implement this upgrade. I dont believe that it is as simple as soldering more chips on top of the others, allough I could be wrong.

Part numbers of chips and where to order would be a big help. also any advice is welcome.

Thanks

Here are the specs for the Hynix HY5DU121622BT-J Ram Chips

512MB    DDR 333    32Mx16    TSOPII (66 Pin)    4 Bank    2.5V    CL2.5

HY = Hynix Memory
5D = DDR SDRAM
U  = VDD= 2.5V & VDDQ= 2.5V
12 = 512M 8K Refresh
16 = X16 Organization
2  = 4 Banks
2  = SSTL_2 Interface
B  = 3rd Generaton
T  = TSOP Package Type
J  = DDR 333 2.5-3-3

This was referanced from the following websight:
http://www.hynix.com/datasheet/ShortFor ... C-DRAM.pdf