Question about Memory Module compatibility on laptops.

[Quiteblock]

I discovered today that one of my Memory modules are faulty, a sticker on it says "replace with HP SPARE 621569-001". After finding this module on http://partsurfer.hp.com/Search.aspx?searchText=621569-001 I was told that this part is no longer supplied, and I should order the replacement, 641369-001 (After selecting a country in the top right). I found both modules on Amazon (http://www.amazon.com/HP-621569-001-1333MHz-PC3-10600-SODIMM/dp/B005UF674S and http://www.amazon.com/HP-641369-001-1600Mhz-PC3-12800-memory/dp/B008L325TW), the 641369-001 memory module (the "replacement") is half the price of the 621569-001 spare part, the problem is the "replacement" mem module (641369-001) is 1600Mhz and PC3-12800, while my memory module(the faulty one) (621569-001) is 1333MHz PC3-10600. So my question is if I get the so called replacement module (641369-001) will it work on my laptop that requires the 621569-001 mem module that HP said is no longer supplied?

 

[C12Friedman]

Interesting question, the answer is just as interesting... Maybe.
If two modules are purchased as a kit, I would have no question about their compatibility but when adding a module (even the exact replacement module) there is always the chance that the modules will not play nice together. I will recommend replacing both modules with a kit of the full amount wanted. Here's where it gets interesting though, there is a better likely hood that they will work together but they will run at the lower speed of 1333MHz - just a heads up that although it should work, it may not - no way to really tell when adding a module until you've tried

 

[Quiteblock]

Interesting question, the answer is just as interesting... Maybe.
If two modules are purchased as a kit, I would have no question about their compatibility but when adding a module (even the exact replacement module) there is always the chance that the modules will not play nice together. I will recommend replacing both modules with a kit of the full amount wanted. Here's where it gets interesting though, there is a better likely hood that they will work together but they will run at the lower speed of 1333MHz - just a heads up that although it should work, it may not - no way to really tell when adding a module until you've tried

So I'm better off playing it safe and buying the same one?

 

[C12Friedman]

If the replacement ram is guaranteed compatible there shouldn't be a problem (check return policy just in case of issues) but I'd be inclined to use Crucial, Kingston or Corsair Ram in there, you can search your model laptop through each of their sites (crucial is probably the best bet) for ram they guarantee to be compatible. If for some reason it doesn't work, they will work with you to get it running or get you modules that will work (they are all quite good about that). They also have a lifetime warranty
Crucial: http://www.crucial.com/usa/en/advisor?gclid=CPPUyNyjjb8CFVJefgod5joAaA&ef_id=U6atRwAAAYz5BzGt:20140622103143:s
Kingston: http://www.kingston.com/us/memory/upgrades?ktc_campaign=US_Branded&gclid=COHE0POjjb8CFY17fgodE20ASA
Corsair: http://www.corsair.com/en-us/memory-finder
AData, GSkill and other ram brands also have memory finder tools (if interested in other options)

 

[Quiteblock]

If the replacement ram is guaranteed compatible there shouldn't be a problem (check return policy just in case of issues) but I'd be inclined to use Crucial, Kingston or Corsair Ram in there, you can search your model laptop through each of their sites (crucial is probably the best bet) for ram they guarantee to be compatible. If for some reason it doesn't work, they will work with you to get it running or get you modules that will work (they are all quite good about that). They also have a lifetime warranty
Crucial: http://www.crucial.com/usa/en/advisor?gclid=CPPUyNyjjb8CFVJefgod5joAaA&ef_id=U6atRwAAAYz5BzGt:20140622103143:s
Kingston: http://www.kingston.com/us/memory/upgrades?ktc_campaign=US_Branded&gclid=COHE0POjjb8CFY17fgodE20ASA
Corsair: http://www.corsair.com/en-us/memory-finder
AData, GSkill and other ram brands also have memory finder tools (if interested in other options)

I used Crucial and the 641369-001 ("replacement ram") showed up there as an upgrade option, so I guess its compatible with my laptop and should probably work. Thanks