Problems Pairing older F3-14900CL9D-8GBXL with a newer kit

[Maxavius]

Hello ,
CPU :i 7 2600k
MOBO : GA-Z68X-UD3H-B3 (rev. 1.0) - Gigabyte

I originally purchased a F3-14900CL9D-8GBXL kit for my system back in 2011 and ran fine at 1866Mhz for 5 years.

This past Christmas i decided to up the ante and add another exactly same kit to bring my system to 16GB. If i'm not mistaken what i have here is the equivalent of the F3-14900CL9Q-16GBXL kit.

Both kits are exact same part number and exact same timings on sticker , only difference is manufacturing date (new kit dated 2015) , also in CPU - Z the older kit is listed as XMP 1.2 and the newr kit listed as XMP 1.3.





I can't seem to get these to run in 1866Mhz , I've tried Gigabytes newest release Bios and am now running their EUFI beta bios which provides with more options regarding timing but if i set it to XMP profile 1 , system goes into endless reboot loop. Please help.

[GSKILL TECH]

Try manual settings

Also, do you have each kit installed in same color slots?

[Maxavius]

Tried manual settings but the tRC are different according to CPU-Z , which should i go with , 42 or 37 . And yes original DIMM's are slot 2&4 new ones are in slots 1&3.

here is a picture i took of the two different sticks , only diffrence i see is slightly diffrent design on the outside edge of the heatsinks.

http://i.imgur.com/gm6ys8v.jpg

[Maxavius]

Any sugesstions , i tried manual settings 9-10-9-28-tRC (37to42) 1Tand 2T , still no go.

Could it be that these sticks are not compatible with each other because of the slight updates made since 2011?

Any help would be greatly appreciated , thanks

[GSKILL TECH]

Very possible

You may need to send them in for a single kit of RAM.