Doubt on RAM speed

[JasonBourne]

Just curious what is exactly my RAM speed - 800 or 1600 MHz ??
The image below are screens from CPU-Z application.

 

[Aspendancer]

800MHz

 

[Seba]

You have PC3-12800 a.k.a. DDR3-1600.

The "1600" value from DDR3-1600 is not the frequency in MHz (I guess that this is your concern).

 

[BonzaiDuck]

There is a reason why they call RAM "double-data rate" or DDR.

The idea being, a single frequency cycle is able to carry two bits of data. That's my understanding of it.

So your CPU-Z or Aida-64 may report "800Mhz" for frequency, but it's "DDR3-1600" RAM.

 

[JasonBourne]

You have PC3-12800 a.k.a. DDR3-1600.

The "1600" value from DDR3-1600 is not the frequency in MHz (I guess that this is your concern).

Yup that's the thing I wanted to hear.
BTW, is there any way I can figure out upto what fastedt speed RAMs are compatible for my notebook ?? The notebook is Samsung NP550P5C and has
Processor Core i5 3210M
Chipset B75 Express/HM76 Express

 

[BonzaiDuck]

Yup that's the thing I wanted to hear.
BTW, is there any way I can figure out upto what fastedt speed RAMs are compatible for my notebook ?? The notebook is Samsung NP550P5C and has
Processor Core i5 3210M
Chipset B75 Express/HM76 Express

Have you examined the options in the laptop's BIOS yet?

I'm fairly new to "modern" laptops, and made a project earlier this summer of making a 7-year-old "executive" laptop as fast as I wanted it to be. The BIOS doesn't have any settings for RAM -- voltage, speed or latency settings. If I put DDR2-800 modules in there (which I did), they'll run as DDR2-667. I didn't pick the speed for the laptop, though: it was the size (2x4GB) and the make-model (Crucial) compatible with the lappie's motherboard.

What you have -- I wouldn't know for sure. Most modern desktop boards give options for choosing memory ratios and speeds.

 

[Kelly Shaw]

PC3-12800 is1600MHz, its core frequency is 200MHz, I/O frequency(Max Bandwith) 800MHz, which means its equivalent frequency is 1600MHz

 

[JasonBourne]

Nope, my BIOS doesn't have that kind of options for RAM. So basically I'm left with a scenario where I have to buy the RAM,put it inside and see if the laptop gives permission to run them at their designated speeds, am I right in saying that??
What if I opt for tighter latencies ?? Cuz that too improves performance, I guess.

 

[BonzaiDuck]

Nope, my BIOS doesn't have that kind of options for RAM. So basically I'm left with a scenario where I have to buy the RAM,put it inside and see if the laptop gives permission to run them at their designated speeds, am I right in saying that??
What if I opt for tighter latencies ?? Cuz that too improves performance, I guess.

You shouldn't have to go through trial and error on this.

Just run web-searches for "RAM specification" and the Samsung notebook model -- or equally -- the chipset.

You should be able to turn up a cross-reference at some RAM-maker's web-site. My guess is that the lappie requires DDR3 SO-DIMM. It may well be that you have options for the make, the speed and the latency specs. You're best to confirm that whatever choices you consider, the RAM is deemed compatible or certified as such with the Samsung's motherboard. Or for that matter, the chipset on that motherboard.

 

[JasonBourne]

For B75 Express I got this

So,IMO highest speed supported is 1600 which is already installed in my case.

Same goes for HM76 Express,

But nowhere it says anything about latencies. What should I make of that ??