How do i know what memory is compatible?

TheObserver · Jun 16, 2016

Don't you just look at the DDR type and the PC3 number thing?

My pc says i can take DDR3, PC3 10600 (DDR3-1333) or PC3 12800 (DDR3-1600).

So i'm wondering why i am unable to use this: http://www.newegg.com/Product/Product.aspx?Item=N82E16820148544#close (According to crucials website its not compatible)

but i am able to use this: http://www.crucial.com/usa/en/pavilion-550-036/CT7679388

They both look the same, so what's different about them?

My mobo is a memphis2-s btw

dangus · Jun 16, 2016

where on crucials website does it say it's not compatible?

junkeymonkey · Jun 16, 2016

could be the memory IC's used and then you got a prebuilt like that HP and there proprietary bios's used ? maybe crucial knows this and tested them and can tell you its not ? I'm sure they did not do it to prevent a sale ??

with a prebuilt any upgrade over what you got on it out of its box new or on HP's approve upgrade list is all your own risk and nothing is guaranteed out side of what HP put in it from there factory

you buy , you try , and hope it don't make you cry

maybe like said here ??

* Do not buy high-density or Fully Buffered modules unless you know the PC supports it. Even so, if your PC supports both unbuffered and high-density (registered), use low density to be safe. Typically, high-density (registered) DIMMs will have an R after the speed and Fully buffered will show FB. For example PC2-5300R

http://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Upgrading-Memory/m-p/124/highlight/true#M3

those stick listed maybe low density ??? who know its HP and there way of things

TheObserver · Jun 16, 2016

dangus :

I looked up the sport ram and entered in my prebuilt pc (HP pavillion 550-036) and it says its not compatible

TheObserver · Jun 16, 2016

From google searching it sounds like crucial is just wrong and all i need to do is get a ddr3 10600 or 12800. Maybe it does have to do with it being pre-built.

n0ns3ns3 · Jun 16, 2016

The difference is the the timing and latency.
OEMs like HP and dell support standard (jedec) timings and latencies.
The first kit has CL=9 which is below (faster) than minimum jedec defined for DDR3-1600 (10).
That's why the first kit may or may not work.
https://en.wikipedia.org/wiki/DDR3_SDRAM

JackNaylorPE · Jun 16, 2016

QVLs tend to list what **is** compatible rather than what is not. Someone pays a vendor to test their RAM and get put on this list. Since vendors get income this way, they tend to like it if we buy off the QVL. So usually, the lists contain what passed, and what's missing usually just means, not tested.

TheObserver · Jun 16, 2016

Sooo am i ok to try the sport one?

Neweggs compatibilty search doesn't even have my PC in the list

n0ns3ns3 · Jun 16, 2016

JackNaylorPE :

That's not entirely true. As i already posted above beside clock, there are timings and latency which play huge role.
Unlike other MB (asus, msi, evga etc.) vendors like HP, Dell, Lenovo have limited support for those. So memory for the vendors computers is more of a "standard" and not "faster".

TheObserver · Jun 16, 2016

junkeymonkey :

could be the memory IC's used and then you got a prebuilt like that HP and there proprietary bios's used ? maybe crucial knows this and tested them and can tell you its not ? I'm sure they did not do it to prevent a sale ??

with a prebuilt any upgrade over what you got on it out of its box new or on HP's approve upgrade list is all your own risk and nothing is guaranteed out side of what HP put in it from there factory

you buy , you try , and hope it don't make you cry

maybe like said here ??

* Do not buy high-density or Fully Buffered modules unless you know the PC supports it. Even so, if your PC supports both unbuffered and high-density (registered), use low density to be safe. Typically, high-density (registered) DIMMs will have an R after the speed and Fully buffered will show FB. For example PC2-5300R

http://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Upgrading-Memory/m-p/124/highlight/true#M3

those stick listed maybe low density ??? who know its HP and there way of things

I can only do unbuffered

junkeymonkey · Jun 16, 2016

like I said above you buy you try and hope it don't make you cry its that easy roll the dice and hope it don't come out as snake eyes

dangus · Jun 16, 2016

i have a very good feeling that it will probably work. those OEM motherboards can be kind of annoying though.

TheObserver · Jun 16, 2016

It seems timing is the only thing different and not mentioned in HPs upgrading memory page, everything else i can do.

And crucial seems to be the only one to sell that ram thats recommended for me. Kinda odd

junkeymonkey · Jun 16, 2016

orebuilts like hp sell computers and really don't give a flip on tou upgrading them .. they prefer you go buy there ''better '' ready to go model all hp guarantees it what they sold you as is out of its box from there factory that's all . the rest is all on you

bigpinkdragon286 · Jun 20, 2016

If the machine is expected to be compatible with the original installed RAM memory modules, or the machine has memory permanent to the motherboard, this could invalidate compatibility with many aftermarket RAM memory modules.

Unless all the terms are known that Crucial used to determined the compatibility answer given you, only take this as a recommendation, not a certainty.

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