Unsure of Ram Speed I can use??

August 30, 2012 at 19:42:51
Specs: Windows 64, HP Pavillion A1720N
I need to purchase 4 1 GB sticks of ram for a HP Pavilion PC Desktop Model #A1720N Product# RT641AA #ABA. The user guide says that the ram to update it with is PC2-4200 MB/sec 553 MHz 240 pin DDR2 SDRAM. What I am confused on is there is other PC2-6400 800 MHz ram for sale and it seems like as long as I bought and used two pairs so they are all the same exact stick of ram that the dual channel would work great and run even faster. I am unsure if it even matters to buy ram that has speeds a little faster but figured I'd see what you guys thought. Thanks!!

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August 30, 2012 at 20:11:24
DDR2 533 MHz is what you can use. if you put in DDR2 800MHz and it runs, it will underclock to 533 anyway (if it runs).
Also note that your system supports only FSB1066 which is exactly in tune with DDR2 533 memory anyway. Since both are running at a natural frequency of 266 (DDR2 is a multiplier of 2 and FSB is a multiplier of 4), you are running a CPU/RAM Ratio of 1:1 which is precisely what you should be looking for.
Two of these kits should do it:

Since your system came with Vista 32bit and you list Windows 64 (which does not exist, I assume you have installed or are about to install Windows 7 64bit which is why you want 4GB or memory. Just remember that the system is pretty old and probably pretty slow. Installing 64bit Windows 7 will not speed things up and may just slow things down a bit. Do not invest too much money into upgrading that machine, save it for something new and significantly faster.

You have to be a little bit crazy to keep you from going insane.

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August 30, 2012 at 21:47:25

ARM Devices are the future, great British Design !

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