Question I need some help about ram timings

[Alquist]

I have a ddr3 1333mhz ram with timings like 9-9-9-24, and I want to mix it with different stick which have timings like 9-8-7-6. Should I buy it or not?

my ram: http://mushkin.com/Home/index.php/catalog/memory/essentials/item/1332-997017
other ram : https://www.kingston.com/dataSheets/KVR13N9S8_4.pdf

 

[pete_101]

I have a ddr3 1333mhz ram with timings like 9-9-9-24, and I want to mix it with different stick which have timings like 9-8-7-6. Should I buy it or not?

my ram: http://mushkin.com/Home/index.php/catalog/memory/essentials/item/1332-997017
other ram : https://www.kingston.com/dataSheets/KVR13N9S8_4.pdf

No, don't buy it. It's bad enough mixing RAM with the same specs, but with different timings, you're just asking for issues...might not even post.

 

[Hotrod2go]

Might be ok if you manually get the 2nd set same primary timings as the 1st set. Leave rest of timings on auto, bios should auto configure. I've mixed sets of ram before & even OC them just fine with DDR3 builds.
You may have to start of booting at the lowest RAM bandwidth available in the bios just to get into the bios then set timings manually for primaries, also will probably need voltage tweaks done manually as well.

 

[Misgar]

You're comparing chalk with cheese.

The 9, 8, 7, 6 in the Kingston data sheet is referring to the Programmable CAS (CL) Latency timing only.
https://www.kingston.com/dataSheets/KVR13N9S8_4.pdf

The 9-9-9-24 figures for the Muskin RAM are referring to CL-RCD-RP-RAS, i.e. four different Primary timings.

The CL (CAS) timing on the Kingston DIMMs can be set to 9, or 8, or 7 or 6, depending on the memory clock speed. Higher speed = bigger number.

Looking at my Kingston DDR3-1600 RAM, I'd say:-

CL (CAS) 9 applies to a 1333MT/s (666MHz x 2 for DDR).

CL (CAS) 8 applies to 1244MT/s (622MHz x 2) or thereabouts

CL (CAS) 7 applies to 1066MT/s (533MHz x 2) or similar

CL (CAS) 6 to 888MT/s (444MHz x 2). These numbers vary from one SPD setup to another.

As you lower the memory clock speed, so you can tighten the primary timing values (smaller numbers).

For all I know, your DDR3-1333 Kingston RAM is programmed with an identical 9-9-9-24 in the SPD chip to that in the Muskin, making them similar, but not identical. 9-9-9-24 is a very common timing in DDR3.

Just remember if you intend to install 4 DIMMs in your machine, you may have to lower the memory clock from 1333 to 1200 or 1066MT/s, to maintain stability. Alternatively, relax the CL (CAS) timing at 1333MT/s by one or two clock cycles (make the number bigger in the BIOS manual setup page for RAM timings).

 

[Bob.B]

I have a ddr3 1333mhz ram with timings like 9-9-9-24, and I want to mix it with different stick which have timings like 9-8-7-6. Should I buy it or not?

my ram: http://mushkin.com/Home/index.php/catalog/memory/essentials/item/1332-997017
other ram : https://www.kingston.com/dataSheets/KVR13N9S8_4.pdf

Ddr3 is kind of forgiving when mixing.
If it's only a few bucks try it.
If your really worried make sure of the return policy.

 

[Alquist]

You're comparing chalk with cheese.

The 9, 8, 7, 6 in the Kingston data sheet is referring to the Programmable CAS (CL) Latency timing only.
https://www.kingston.com/dataSheets/KVR13N9S8_4.pdf

The 9-9-9-24 figures for the Muskin RAM are referring to CL-RCD-RP-RAS, i.e. four different Primary timings.

The CL (CAS) timing on the Kingston DIMMs can be set to 9, or 8, or 7 or 6, depending on the memory clock speed. Higher speed = bigger number.

Looking at my Kingston DDR3-1600 RAM, I'd say:-

CL (CAS) 9 applies to a 1333MT/s (666MHz x 2 for DDR).

CL (CAS) 8 applies to 1244MT/s (622MHz x 2) or thereabouts

CL (CAS) 7 applies to 1066MT/s (533MHz x 2) or similar

CL (CAS) 6 to 888MT/s (444MHz x 2). These numbers vary from one SPD setup to another.

As you lower the memory clock speed, so you can tighten the primary timing values (smaller numbers).

For all I know, your DDR3-1333 Kingston RAM is programmed with an identical 9-9-9-24 in the SPD chip to that in the Muskin, making them similar, but not identical. 9-9-9-24 is a very common timing in DDR3.

Just remember if you intend to install 4 DIMMs in your machine, you may have to lower the memory clock from 1333 to 1200 or 1066MT/s, to maintain stability. Alternatively, relax the CL (CAS) timing at 1333MT/s by one or two clock cycles (make the number bigger in the BIOS manual setup page for RAM timings).

thanks for deep explanation