Is this ram compatible with my laptop

I'm trying to add more ram into my laptop but can't find out which to buy.

My Ram:

My Motherboard: Hewlett-Packard 1849 (Socket FT1)

Trying to buy: or

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1 Answer

Chosen Solution

When looking at RAM you want to match 5 things to your motherboard:

  1. RAM type and pins - obviously these are all DDR type 3 (DDR3) and they're all 184 pin so that's good
  2. Data/transfer rating - These are both 1600 mega transfers/second (transfer rating), aka 12800 megabytes/second, so that's good. Data/transfer rating is meant to be backwards compatible, meaning if you got some memory that was rated higher than 1600MT/s it would usually (assuming it conforms to the standards) de-rate itself and run at 1600 without problem. Note, however that running at a lower clockspeed would affect #4 below, latency.
  3. Voltage - the L in the model numbers of all 3 memory modules indicates Low Voltage. Regular DDR voltage is 1.5V, low voltage is 1.35V. There's also ultra low voltage at 1.25V I believe. Anyway, most low voltage memory is dual-rated, meaning it will also work at regular voltage, but the opposite is not true- 1.5V RAM is not meant to operate at 1.35V and will cause problems if it functions at all. In your case this is a moot point as the original memory and replacement is low voltage RAM.
  4. Latency and timing - this is the concern in your case. Latency involves the amount of clock cycles it takes for the RAM to respond to a request. Mixing latencies is a crapshoot - it may work, or it may have intermittent issues, or it may not boot at all. When you see a list of numbers on memory, such as on the G.Skill's CL9-9-9-28 or CL11-11-11-28, the first and most important number is latency. Your original Hynix is more ambiguous but if you look up it's spec sheet you'll find it's 11-11-11- 35. So almost the same as the F3-1600C11S-4GSL. The last value, the 28/35, is tRAS or row active timing. Ideally it should be the same, but in this case it's close and it will probably work fine.
  5. Channel configuration - Some motherboards allow single modules of memory installed - single channel memory - and some require or work better with 2 modules or more. Those that want pairs of memory installed ostensibly work best with dual-channel (or quad-channel) configured modules that are all essentially identical. In your case your motherboard is single channel and all the memory modules are single channel so it's another moot point.

So all that said, yes it most like will work fine, but as the above suggests memory matching can be a tricky business. Sometimes, for example, a motherboard may not boot because of the memory installed even though the memory meets every spec required on paper. A different brand, though, may work fine. So if you can get identical memory to your Hynix for around the same price go for that. In practice, though, you likely won't have a problem with the G.Skill 11.

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