Upgrading older G.Skill 4GB to 12GB

[misterioso]

I'm currently running 4GB of G.Skill DDR3 (2X2GB) which I'd like to increase to either 8 or 12 GB total. My current G.Skill memory is not longer sold, so I'm trying to find something compatible that can run alongside my existing memory.

Current Memory
Brand: G.SKILL
Series: Ripjaws Series
Model: F3-12800CL7D-4GBRH
Type 240-Pin DDR3 SDRAM 4GB (2 x 2GB)
Speed: DDR3 1600 (PC3 12800)
Cas Latency: 7
Timing: 7-7-7-24
Voltage: 1.6V
ECC: No
Buffered/Registered: Unbuffered

I picked out the following dual channel kit to occupy the 2 remaining slots I have.
Brand: G.SKILL
Series: Ripjaws Series
Model: F3-12800CL8D-8GBRM
Type: 240-Pin DDR3 SDRAM 8GB (2 x 4GB)
Speed: DDR3 1600 (PC3 12800)
Cas Latency: 8
Timing: 8-8-8-24
Voltage: 1.6V

Will this work? The voltages are the same, but the latency and timing specs are different. I cannot find anything that is an exact match for my old memory.

If there is different G.Skill model that is more compatible, please let me know.

Also, are there any problems with mixing and matching 2GB and 4GB sticks on my mobo or should I go with 8 GB (4X2GB) total instead of 12 GB (2X2GB+2X4GB)?

Thanks in advance for your help.

System Specs
CPU: Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core
MB: GIGABYTE GA-P55M-UD2 LGA 1156 Intel P55 Micro ATX
OS: Win 7 Home Premium 64-bit
GC: ASUS EN9600GSO/DI/512MD3/V2 GeForce 9600 GSO 512MB 128-bit
Sound: Asus Xonar DS
Memory: G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3
PSU:OCZ ModXStream Pro 600W Modular High Performance P.S.
HD:SAMSUNG EcoGreen F2 HD103SI 1TB 5400 RPM SATA 3.0Gb/s 3.5"
Cooling:COOLER MASTER Hyper 212 Plus RR-B10-212P-G1

[Tradesman]

Up front, ANY time you mix sets of DRAM, even of the same model, and even with consecutive sets, it can be problematic, mixing sets that run different timings, even more so, and then mixing sets of different density, again, even more so (and though not applicable here using AMD CPUs really makes it tough).....If you use more than one set, XMP won't work as the sticks are programmed for XMP by the packaged set, so base timings and often Advanced timings all have to be set manually, (which can be a real pain. With your combo I'd suggest going straight to 16GB 4x4GB or even with a 3x4GB set

[misterioso]

After my original post, I read through all the message threads about mixing and matching memory and its inherent problems, so what you stated is not a shock. So moving forward, I'm looking at the G.SKILL memory configurator and I'm seeing some conflicting information.

The configurator page for my Gigabyte P55M-UD2 shows the Ripjaws X F3-10666CL9D-8GBXL as certified, but when you go to the Ripjaws X F3-10666CL9D-8GBXL page, my P55M-UD2 does not appear in the qualified motherboards list. So which one is correct? Is it qualified or not qualified?

GB P55M-UD2 configurator page
http://www.gskill.com/configurator2....dGU=&model=454

F3-10666CL9D-8GBXL page
http://www.gskill.com/products.php?index=345

I'm also not seeing any 16 GB kits on the P55M-UD2 page, making me wonder if the information is out of date. If the F3-10666CL9D-8GBXL is certified, what about the F3-10666CL9Q-16GBXL. Two more sticks of the same DRAM, so I should be good to go???

Thanks again for the reply.

[GSKILL TECH]

Yep, no problem at all.

Thank you
GSKILL TECH

[misterioso]

@Tradesman or @GSKILL TECH-

So what 16GB dual channel kit can I use? There isn't anything showing up in qualified kits list for my mobo, so right now it's guesswork for me. Any ideas?

TIA

[GSKILL TECH]

F3-10666CL9Q-16GBXL

This kit can work fine.

or you can use any DDR3-1600 CL7, DDR3-1333 CL7, many kits are compatible.

Thank you
GSKILL TECH