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1.5v vs 1.35v laptop memory

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ultimate99    51

My laptop came with a 4gb 1.35v ram and I want to upgrade to 2x8gb ram. However, I find that 1.5v tend to be cheaper than 1.35v. Why is that? Any real world difference in performance? 

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Luc2k    728

They laptop will last longer on battery most likely and the memory should release less heat, but I'm not sure of the actual stats.

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snaphat (Myles Landwehr)    414

There's not going to be a performance difference. Spec's are specs in that regard. You need to make sure your laptop is compatible with whatever voltage you get though.

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ultimate99    51

There's not going to be a performance difference. Spec's are specs in that regard. You need to make sure your laptop is compatible with whatever voltage you get though.

Well, i think both, as I have 2 in, one 1.5v and the other 1.35v.

 

So I guess I could go with the cheapest 1.5v.

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Luc2k    728

Well, i think both, as I have 2 in, one 1.5v and the other 1.35v.

 

So I guess I could go with the cheapest 1.5v.

That probably means they're both running at 1.5v.

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Jason S.    1,231

That probably means they're both running at 1.5v.

i agree - theyre probably both running at 1.5v.

 

i'd just go w/ the cheaper stuff if youre upgrading. ive never seen benchmarks, but i'd be very curious about what impact on battery life the 2 specs would have.

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snaphat (Myles Landwehr)    414

i agree - theyre probably both running at 1.5v.

 

i'd just go w/ the cheaper stuff if youre upgrading. ive never seen benchmarks, but i'd be very curious about what impact on battery life the 2 specs would have.

It's going to be 1-2W difference @ load and <1W @ non-load per dimm. So how much of a difference it makes would depend on the laptop. For example, mine has a 16W TDP and uses 11-13W typically. So you could get a difference in power consumption of ~7-30% (because even a single Watt is considerable difference).                

 

see: http://www.servethehome.com/testing-power-savings-low-voltage-135v-kingston-memory-intel-avoton/

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ultimate99    51

The bigger the latency the better?

  • Cas Latency: 9
  • Timing: 9-9-9-28
  • $176
  •  

vs

 

  • Cas Latency: 11
  • Timing: 11-11-11-28
  • $180

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Jason S.    1,231

 

The bigger the latency the better?

  • Cas Latency: 9
  • Timing: 9-9-9-28
  • $176
  •  

vs

 

  • Cas Latency: 11
  • Timing: 11-11-11-28
  • $180

 

no, latency means 'delay'. you want lower latency (less delay)

 

http://en.wikipedia.org/wiki/Cas_latency

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