Darn, that latency's painful!

[igor_kavinski]

So I got this laptop for about $180 and I thought it was a real deal. Came with a stylus and the build quality was pretty good. But in experience, it feels like a darn netbook!

So I checked what was wrong with it and look at this:



Grandmas have faster reflexes than that latency!!!

@Det0x , it seems LPDDR4 and probably LPDDR5 have serious issues where despite being CL20, the latency is almost 2.5 times as bad.

@adroc_thurston may be able to shed some light on the why and how.

Interestingly, slots 1 to 4 are empty. This was meant to be a 16GB laptop but it was cut down. So that might affect the bandwidth but don't think the latency will improve even with the full 16GB.

 

[Shmee]

Can you replace the RAM? I wouldn't buy a laptop that wasn't easy to work on.

 

[igor_kavinski]

Can you replace the RAM? I wouldn't buy a laptop that wasn't easy to work on.

LPDDR4. So it's soldered.

I bought it more as a curiosity coz I had used an i3-1115G4 before but that one had fast DDR4 SODIMM, at least 2666 or more.

This one seems to be DDR4-2133 CL20 which shouldn't be this slow but adroc mentioned that LPDDR memories have very high latencies. He was right.

 

[Shmee]

Hmm, such a pity.

 

[Hail The Brain Slug]

This is my 6900HS laptop with LPDDR5 6400. Better, but still leagues away from desktop DDR5.

 

[fastandfurious6]

the last real Intel cpu was ivy bridge

you'd be happier with a used T430 from 2012 it costs peanuts

 

[Shmee]

the last real Intel cpu was ivy bridge

you'd be happier with a used T430 from 2012 it costs peanuts

No I think it was Haswell/Broadwell EP. Early DDR4 Xeons.

 

[igor_kavinski]

you'd be happier with a used T430 from 2012 it costs peanuts

Yeah that's why typing this on a Thinkpad W530 with i7-3720QM 😀