Difference in RAM Latency- Need Advice

[TheTrooper]

Hi, 

Building a computer with 64 Gb Gskill Trident Z RAM. I have 2 x 16gb 3200 16D (CL 16-18-18-38) & 2 X 16gb 3200 15D (CL 15-15-15-35). Would the difference in latency cause a problem? The guys at the shop where I bought it from ( they don't anymore 16D in stock) said that it's fine and that the motherboard would adjust it to the lower latency of the two. I've read elsewhere that it may or may not cause a problem. Please advise... I'm a beginner so am very concerned. The motherboard I have is the Asus Maximus X Hero Wifi. 

[skimmilk5]

What CPU are you using? Honestly, if it doesn't work, you'll know it doesn't work (and your motherboard's POST code readout will tell you), in which case, just return it and get a different kit.

[shooter2749]

4 minutes ago, RoyJ said:

Hi, 

Building a computer with 64 Gb Gskill Trident Z RAM. I have 2 x 16gb 3200 16D (CL 16-18-18-38) & 2 X 16gb 3200 15D (CL 15-15-15-35). Would the difference in latency cause a problem? The guys at the shop where I bought it from ( they don't anymore 16D in stock) said that it's fine and that the motherboard would adjust it to the lower latency of the two. I've read elsewhere that it may or may not cause a problem. Please advise... I'm a beginner so am very concerned. The motherboard I have is the Asus Maximus X Hero Wifi. 

I cant say that it wont cause issues since ive never tried it but if anything the mobo will adjust to the worst latency of the two which is cl16 (your cl 15 can go to cl 16 by being adjusteed by the mobo but the cl16 cant go to cl15 since its not made for that, the guy at the shoip is wrong)

[TheTrooper]

7 minutes ago, kimsejin5 said:

What CPU are you using? Honestly, if it doesn't work, you'll know it doesn't work (and your motherboard's POST code readout will tell you), in which case, just return it and get a different kit.

An I7-8700k. So i won't damage anything by trying would I?  That's what I am afraid of.

[skimmilk5]

No, you won't break anything.

[Godlygamer23]

3 minutes ago, RoyJ said:

An I7-8700k. So i won't damage anything by trying would I?  That's what I am afraid of.

No, you'll just have to either reset the CMOS or hit the Memtest button, depending on the motherboard, to get it working again if it gets to that point. It also depends on where the instability occurs(start-up or within Windows). If it's within Windows, you can just restart and go back into the BIOS to change it.

[-rascal-]

3 hours ago, RoyJ said:

The guys at the shop where I bought it from ( they don't anymore 16D in stock) said that it's fine and that the motherboard would adjust it to the lower latency of the two.  

 

What...if it would, the motherboard would adjust to the HIGHER latency of the two.

The tighter / lower 15-15-15-35 might not be stable on the slower CAS 16 kit -- since RAM is binned at the factory.

The CAS 15 kit will run at the slower CAS 16 timings.

 

See if you can get away with CAS 15 for both kits.

As @Godlygamer23 mentioned, if it fails, then you need to clear the CMOS to reset your BIOS.