[SOLVED] cas latency. Does it matter?

[PaulosK]

A friend of mine wants to upgrade his laptop's ram. His ram is this one:
MT8KTF51264HZ-1G9P2 Micron
i found 3 laptop rams that are 8gb, 1slot, ddr3 and 1866mhz.

G.skill F3-1866C11S-8GRSL
HyperX Impact HX318LS11IB/8
Team Group Elite SO-DIMM DDR3 1866MHz 8GB (TED38G1866C13-S01)
the first 2 are Cas 11, with the original being cas 13. The last one is 1.5 volts and the original is 1.35v. Which one will work?


(unrelated to the topic, but didnt want to open new thread. The laptop has sata II, a sata III ssd will work with redused speed, right?)

 

[4745454b]

What's supposed to happen is you add the RAM, the system reads what they are and what they can handle. Settings that both can handle are then applied and you move on with more ram. Most of the time this probably even works. Matched sets exist for a reason however. Assuming they are the right ram for your system, these will 100%, or 99.999% work together. Buying a new matched set will be easiest.

You don't have to however. If you are willing to risk buying a single new stick to pair with the stick you have I'd pay attention to the speed first. Make sure it's rated to run at 1866 or better Some sticks are rated to run at 1600, 1866 would be considered an OC. Next number would be the timings. The closer they are to the original stick the better. CAS 11 should work with CAS 13, at CAS13 speeds. CAS 13 trying to work at CAS 11 speeds would be considered an OC. The original stick is running at 1.35V, so buy another stick with that voltage setting. The new stick should be 13-x-x-x, 1866MHz @ 1.35V.

 

[Eximo]

Yes, a SATA III SSD will just run at SATA II speeds when plugged into a SATA II system.

 

[Bob.B]

A friend of mine wants to upgrade his laptop's ram. His ram is this one:
MT8KTF51264HZ-1G9P2 Micron
i found 3 laptop rams that are 8gb, 1slot, ddr3 and 1866mhz.

G.skill F3-1866C11S-8GRSL
HyperX Impact HX318LS11IB/8
Team Group Elite SO-DIMM DDR3 1866MHz 8GB (TED38G1866C13-S01)
the first 2 are Cas 11, with the original being cas 13. The last one is 1.5 volts and the original is 1.35v. Which one will work?


(unrelated to the topic, but didnt want to open new thread. The laptop has sata II, a sata III ssd will work with redused speed, right?)

Go here and run the scanner pick the ram stick you want.
Crucial

 

[SamirD]

the first 2 are Cas 11, with the original being cas 13. The last one is 1.5 volts and the original is 1.35v. Which one will work?


(unrelated to the topic, but didnt want to open new thread. The laptop has sata II, a sata III ssd will work with redused speed, right?)

The lower cas 11 modules should definitely work. The voltage raises an important question--is the socket rated for DDR3L? If so, then it will ONLY work with DDR3L modules. DDR3L modules however will work fine in a regular 1.5V DDR3 socket because the modules support both voltages.

Yep, sata 3 will work fine with sata 2 socket (or even sata 1). Sometimes there are oddball issues that occur though from cheap ones that cut corners on backward compatibility or other non-compliant designs. And this can be on the the sata controller side too.

 

[PaulosK]

The lower cas 11 modules should definitely work. The voltage raises an important question--is the socket rated for DDR3L? If so, then it will ONLY work with DDR3L modules. DDR3L modules however will work fine in a regular 1.5V DDR3 socket because the modules support both voltages.

Yep, sata 3 will work fine with sata 2 socket (or even sata 1). Sometimes there are oddball issues that occur though from cheap ones that cut corners on backward compatibility or other non-compliant designs. And this can be on the the sata controller side too.

as far as i am concerned it is ddr3 only. There isn't much documendation on this laptop (turbo-x d15d)

 

[PaulosK]

Go here and run the scanner pick the ram stick you want.
Crucial

i dont think it will have this laptop.

 

[PaulosK]

What's supposed to happen is you add the RAM, the system reads what they are and what they can handle. Settings that both can handle are then applied and you move on with more ram. Most of the time this probably even works. Matched sets exist for a reason however. Assuming they are the right ram for your system, these will 100%, or 99.999% work together. Buying a new matched set will be easiest.

You don't have to however. If you are willing to risk buying a single new stick to pair with the stick you have I'd pay attention to the speed first. Make sure it's rated to run at 1866 or better Some sticks are rated to run at 1600, 1866 would be considered an OC. Next number would be the timings. The closer they are to the original stick the better. CAS 11 should work with CAS 13, at CAS13 speeds. CAS 13 trying to work at CAS 11 speeds would be considered an OC. The original stick is running at 1.35V, so buy another stick with that voltage setting. The new stick should be 13-x-x-x, 1866MHz @ 1.35V.

it is a one slot laptop. The new stick will replace the old one

 

[Bob.B]

i dont think it will have this laptop.

Did you try it?

 

[PaulosK]

Did you try it?

yes. It didn't found any

 

[4745454b]

If you aren't matching anything close should work. If get same speed and 1.35v. The lower the cas the better, but you don't have to get 11.

 

[gskill support]

In general or theory, lower timings is better, however not all pre-built systems / BIOS can support timings other than the standard. So while CL11 sounds great because it's lower, the laptop may not support it so it would need to attempt a lower profile. Otherwise, if there is no compatible profile, the RAM will not work properly. This would make the RAM useless to you even if it is better, so with pre-built computers it is generally best to follow the standard, or hopefully someone has tested or can confirm a lower timing can work for the particular system model.

Also, while DDR3L modules can support 1.35V and 1.50V, it does not mean any DDR3 system can support the RAM. This duality was for the transition period where some CPUs could support both Voltages, not a solution where the newer RAM can simply work in any older system.