Pavilion DV7: upgrading RAM dv7

Hello

I have a Pavilion dv7, 2230sa (CNF9491PVP) with 4 GB of RAM. I would like to upgrade to 8 GB (2 x 4 GB).  But, I don't know what type of RAM to buy. There are several specifications (667 800... MHz or PC2-5300, 6400...).

You might it sort my problem please? (Sorry for my English)

Thank you.

LADI

Repair:

Locations SODIMM for memory 2 Customer-accessible/extendable 800 MHz, PC2-6400 DDR2 dual channel support up to system 8192 MB ● total of 8192 MB system memory (4096 MB x 2, dual-channel)

Good news, bad news. The good news is that it can take 8 gigs. The bad news is that it's DDR2-800 memory. 8 GB is very expensive:

http://www.Amazon.com/Corsair-2x4GB-laptop-memory-VS8GSDSKIT800D2/DP/B001V738V4/ref=sr_1_5?ie=UTF8&QID=1452286670&SR=8-5&keywords=8+gigs+DDR2-800+so-DIMM

http://www.Amazon.com/crucial-PC2-6400-200-pin-notebook-CT51264AC800/DP/B001RB21JE/ref=sr_1_1?ie=UTF8&QID=1452286670&SR=8-1&keywords=8+gigs+DDR2-800+so-DIMM

Not a typing mistake. You are looking at a price of at least $150 to get this memory of any reputable vendor.

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