Matching memory - More than just brand and speed?

[SM Phoo]

Hey guys, I made a topic yesterday about adding more memory and it causing bluescreens.

 

Today I've been able to do some stress testing, I think I know what the problem is, but I'll look for advice anyway.

So, yesterday, when using XMP, my now 4x8gb sticks of G.Skill ram would cause my PC to bluescreen, while reverting back disabling xmp would be fine.

 

Today, using prime 95, I have done these tests (They're only 30mins long each, I know a lot longer is recommended)

32GB XMP Disabled - Passed all tests

32GB XMP Enabled - Failed within the first minute

16GB XMP Enabled - Passed all tests (This was my original memory)

16GB XMP Enabled - Passed all tests (My newly bought memory)

 

So, I started looking at the model numbers. I thought matching the brand and speed would be enough, but maybe it isn't. On the side of the ram, the numbers are different

 

One one, it has

F4-300C15Q-32GTZR

DDR4-3000 CL15-16-16-35 1.35v

PC4-24000 8Gx4 Intel XMP 2.0 Ready

 

While on the others it has

F4-300C16D-16GTZR

DDR4-3000 CL16-18-18-38 1.35v

PC4-24000 Gx2 Inte; XMP 2.0 Ready

 

So, the only thing I can imagine is these, although seem to be the exact same sticks of ram are not.

Is there anyway for me to clock all 4 to 3000mhz without problems, or will that not be possible at all?

 

Thanks

[Supportsneedlove]

10 minutes ago, SM Phoo said:

Hey guys, I made a topic yesterday about adding more memory and it causing bluescreens.

 

Today I've been able to do some stress testing, I think I know what the problem is, but I'll look for advice anyway.

So, yesterday, when using XMP, my now 4x8gb sticks of G.Skill ram would cause my PC to bluescreen, while reverting back disabling xmp would be fine.

 

Today, using prime 95, I have done these tests (They're only 30mins long each, I know a lot longer is recommended)

32GB XMP Disabled - Passed all tests

32GB XMP Enabled - Failed within the first minute

16GB XMP Enabled - Passed all tests (This was my original memory)

16GB XMP Enabled - Passed all tests (My newly bought memory)

 

So, I started looking at the model numbers. I thought matching the brand and speed would be enough, but maybe it isn't. On the side of the ram, the numbers are different

 

One one, it has

F4-300C15Q-32GTZR

DDR4-3000 CL15-16-16-35 1.35v

PC4-24000 8Gx4 Intel XMP 2.0 Ready

 

While on the others it has

F4-300C16D-16GTZR

DDR4-3000 CL16-18-18-38 1.35v

PC4-24000 Gx2 Inte; XMP 2.0 Ready

 

So, the only thing I can imagine is these, although seem to be the exact same sticks of ram are not.

Is there anyway for me to clock all 4 to 3000mhz without problems, or will that not be possible at all?

 

Thanks

If the speeds don't match they should all run at the speed of the slowest stick. 

[SM Phoo]

1 minute ago, Supportsneedlove said:

If the speeds don't match they should all run at the speed of the slowest stick. 

They're all 3000hmz sticks, both sets work fine separate, but blue screen when all 4 are connected.

[Sakkura]

They can easily be wildly different chips, and even if they aren't, there's always a (small) risk of compatibility issues when mixing different kits of memory. Even if they are completely identical.

 

In this case, the first kit has lower timings which might indicate it's using a better memory die. Doesn't seem quite good enough to be Samsung B-die, but could still be a cut above the other kit.

[-rascal-]

5 hours ago, SM Phoo said:

They're all 3000hmz sticks, both sets work fine separate, but blue screen when all 4 are connected.

 

Both a DDR4-3000 MHz, but one set is rated for 15-16-16-36 timings, while the other is 16-18-18-38.

Make sure, when you enable XMP, IF YOU CAN CHOOSE, pick the DDR4-3000 16-18-18-38 options.

 

I am suspecting you are applying the 3000 15-16-16-36 XMP profile across ALL your memory sticks, and the slower set is not stable with the tighter timings.

 

You typically want to match FREQUENCY, TIMINGS, and VOLTAGES.

Brand doesn't matter too much, and IMO, model number isn't too much of a concern.

 

I'm using a kit of F4-3200C14D-16GTZ with a kit of F4-3200C14D-16GTZR.

Manufacture date is like 1+ year apart. One is RGB, while the other is not.

Same frequency, timings, and voltage.

Literally plug-n-go.

[SM Phoo]

@-rascal- I'll have a look, thank you. From what I remember, it was picking the 15-16-115-36. I don't know how I'll be able to change it, but I will have a look.

Could the positions in the ram slot make an automatic choice here?, Maybe switching them around would change it

[ReHWolution]

Yes, it should. If you put the 16-18-18 modules in the primary slots (2-4-6-8 on 8 slot motherboards, 2-4 on 4 slot motherboards) it should read those modules' XMP first.

[Vacras]

Are you on the newest bios version? I’ve often resolved such issues by updating it.