Mixing Memory and finding affordable DDR2

Hello gents,

My desktop right now is running 4 GB of RAM and I want to bump it up to 8 before DDR2 goes away forever.
However, I'm currently using OCZ reaperX RAM. This can't be installed next to eachother, already limiting me to single channel, not dual channel, which will run the RAM at 800MHz.

Current RAM: http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3495738&CatId=2265
MOBO: k9as cf-f http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=3489727&csid=ITD&body=MAIN
Processor: AMDx2 64bit http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2207283

-Am I able to mix RAM with the reaperx safely? How do I go about doing that? (I was always just told not to mix RAM)
-Would it be better to change to new RAM and ge tthe dual channel?
-Can anyone find some affordable DDR2 that's compatible on the market? I got the reaperX for around $50 I think (2 years ago), but with DDR2 going away its hard to find reasonable prices.

Thanks for any help!
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More about mixing memory finding affordable ddr2
  1. First you'd have to find another set of DDR2 '1000 MHz' 5-5-5-18 @ 2.1v for them to work properly together. You 'can' mix-match Frequency, CAS and attempt an averaging of Voltage but it's a 'CONCOCTION' of MAYBE. Also, mixing the Type including IC's and Brand itself has no guarantees. OCZ got out of the RAM business for a good reason - they produced inferior RAM and people quit buying their 'stuff.'

    I assume that you have a 64-bit OS otherwise 4GB is your MAX.

    Mix-Match ; ALL BIOS Values must be entered manually and the MOBO BIOS must/slould have access to: DRAM Frequency, DRAM Voltage, and CAS Timings; otherwise the chances are even further reduced that the 'SPD' encoding will 'by chance' accommodate the mix.

    1000 MHz 5-5-5-18 @ 2.1v
    1066 MHz 6-6-6-20 @ 1.8v
    1000 MHz 6-6-6-20 @ 1.95v + PRAY ; BIOS

    The closet matche I found is the F2-8000CL5D-4GBPQ -> http://www.newegg.com/Product/Product.aspx?Item=N82E16820231145

    1000 MHz 5-5-5-18 @ 2.1v
    1000 MHz 5-5-5-15 @ 2.0~2.1v
    1000 MHz 5-5-5-18 @ 2.1v + PRAY ; BIOS

    RAM Specs:
    link -> http://www.ocztechnology.com/ocz-ddr2-pc2-8000-reaperx-hpc-4gb-edition-eol.html
    1000MHz DDR2
    2.1 Volts

    MOBO Specs:
    Memory Supported: 533MHz DDR2
    Dual Channel Supported
    667MHz DDR2
    800MHz DDR2
    1066MHz DDR2 (AM2+ CPU Only)

    Memory Type: DDR2
    Number of Pins: 240-Pin
    Number of Slots: 4
    Maximum Memory Supported: 8GB - 64bit
    Max. Memory Supported Per Slot: 2GB
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