Different timings with same RAM

Dom_79

Distinguished
I have been running Corsair Vengeance Pro 8GB (2x4GB) 1600MHz CL9

I recently purchased 8GB (2x4GB) more of the exact same RAM ( Corsair V. Pro 1600 CL9) but with BLUE heat spreaders (first ones were SILVER)

Had issues getting my rig to boot, then trouble getting the new RAM recognized. After much switching of slots with all the different modules, got it all playing nice together :D

So before doing stress testing to make sure it's sound I check CPUZ... It appears my new sticks have looser timings at 1600MHz than my original set (at lower Freg. they are the same)

Just wondering if that is something the mobo will do automatically, maybe I have gotten bad sticks or if I should set the timings manually in BIOS. So far have only enabled XMP profile to achieve 1600MHz, otherwise they will only run at 1333MHz

My complete rig is in my profile but quick points

Motherboard: GA-Z87X-D3H
RAM: Corsair Vengeance Pro CMY8GX3M2A1600C9A(2x4GB silver heat spreader, made 12/13)
Corsair Vengeance Pro CMY8GX3M2A1600C9B(2x4GB blue heat spreader, made 15/13)
Corsair TX750M

Timings of note(different) tRC 33 (on the BLUEs) and tRC 41 (on the SILVERs)

The tRAS was also different 24 and 33 but those seem to have matched up and both are at 24 now)

Thanks in advance for any help/ advice, I'm really puzzled about this :??:

EDIT: for more specs and to add - Could this just be the Motherboard having issues reporting or possibly CPUZ?
 
Solution
One set is newer than the other and made with slightly differently binned memory chips so they had to adjust the tRC to run well at the spec 9-9-9-24

Dom_79

Distinguished


So I have nothing to worry about then?(he asked ever so politely and hopefully ;) )

I have also successfully completed 3 passes of IBT with max memory (not the best/ most comprehensive RAM test but...) so I'm thinking I was worried about nothing.

Also worth mentioning, I have a BIOS update available (F9) that (according to one source) eliminated issues that my series of motherboard was having when all DIMM slots were occupied (it also supports K series chips and OC better)
 

Tradesman1

Legenda in Aeternum
If all is running well you should be fine, this happens fairly often, the manufacturers might change the chips they use or use the same that were binned differently, or might find that newer mobos operate with the sticks at slightly different settings, and slight changes are made.