Advice on mixing DDR3 having different speeds needed

[Geor9e]

My mainboard is a Gigabyte GA-H67MA-UD2H-B3 (rev. 1.1) powered by a Intel Core-i5 2500. Nothing is overclocked (H67 not able) and the system is super stable :-)

So, the system already has two sticks of 4GB 1333MHz rated RAM, .. a total of 8GB running dual channel with module/rank interleaving on at 1333MHz.

Now I'd like to add 2 more sticks of 4GB for a total of 16GB. However, I can only source the latest part which is rated for 1600MHz, from the same RAM manufacturer.

In the attached image you can see my current RAM on the right hand side.
The part I'd like to add is on the left.

I'm not sure if they would work well together seeing as the BIOS only allows setting the memory frequency on a system wide basis... Of course CAS timings etc are available for each module.

I have seen the newer part in my local shop and the PCB and chip layout is identical fwiw.

Advice needed as I have no idea if it's standard practice for high speed rated ram to be able to run at a slower speed (i.e run 1600 part @ 1333) -I presumed it was normal practice but after seeing the docs, and there is no mention of 1333mhz, I'm not sure.


For reference here are the www links for the docs:

New part which I'd like to add to system: http://www.elixir-memory.com/product...IMM-R11-HS.pdf
Existing part which will remain in place: http://www.elixir-memory.com/product...-UDIMM-R11.pdf


Side Note: I'm very happy with this RAM. At first I was hesitant to go with what first appears to be "unbranded" memory but after investigating Nanya I found they are a Tier-1 Taiwanese fab that actually make the silicon and ensemble the chips. I was far happier to make this purchase and even save money over buying something that had been re-badged. Basically; My setup runs 24/7 at 50% CPU usage, 6GB RAM load in Windows, In a tropical country & high system temps ....and my system has been rock solid.

My SYSTEM:

Windows Home Premium SP1 64bits running on...

Gigabyte GA-H67MA-UD2H-B3 v1.1 (Bios F8)
Intel Core i5-2500 & stock cooler
2 x Nanya Technology Elixir DDR3 PC-10600 1333Mhz 4GB
GFX#1 - Intel IGP
GFX#2 - Asus Geforce EN210 1GB PCI-E 16x
4 x Samsung EX2220X LCD
Intel X25-M 80GB
550W PSU

[Geor9e]

Re: Advice on mixing DDR3 having different speeds needed

Follow-Up to my original post:

Dropped in 2 x DDR3 1600 MHz modules to compliment my existing DDR3 1333 MHz ram.
...All four modules working good @1333 MHz 9-9-9-24-2T.

Confirmed Stable Spec:

Intel Core i5-2500
Gigabyte H67MA-UD2H-B3 (F8)
2 x 4GB Nanya Technology Elixir M2F4G64CB8HB5N-CG /PC3-10700
2 x 4GB Nanya Technology Elixir M2X4G64CB8HG5N-DG /PC3-12800

[Acebmxer]

Re: Advice on mixing DDR3 having different speeds needed

Yes you can run mixed sets of ram. I is not suggested as it can be very trouble some to get them working correctly. You will have to downclock the faster ram to run at the slower speed or hope your slower ram can run as fast as the faster ram.