Corsair 1866mhz memory problem

[srkrono]

So i purchased 2 of these kits of ram http://www.amazon.com/gp/product/B007Z1CVHW/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

popped them in, everything boot right, sounds good?

well i noticed a few days after that my memory was only on 1333mhz

so i swapped it to use the XMP profile 1 (which is the only one)

well now my system wont boot passed the bios, i keep getting an error that basically says the config might not be compatible

the system will boot perfect on 1333mhz, and to get it to boot on 1600mhz i have to change the timing to 10-9-10-9-26 and set the ram voltage to 1.55v

can anyone explain how to get it to 1866mhz

nothing is overclocked in my system by the way

Motherboard im using is Gigabyte GA-990FXA-UD3 Rev 4

CPU im using is AMD FX-8350 (Stock Clocks)

someone please help 🙁

 

[JackNaylorPE]

If you want 16GB, you need to buy either:

One set of 4 x 4GB
One set of 2 x 8GB

Two sets of 2 x 4GB are not guaranteed to work together

To get this to work, various options you might try...

Raise DRAM voltage
Loosen RAM timings
Downclock CPU

 

[srkrono]

damn! wish i would have known that before i bought them 🙁

what do you mean by loosen the timings? what would be an example of a loose timing?

 

[JackNaylorPE]

The timings are 9-10-9-27,

To "loosen" timings, you use bigger numbers. Try the Corsair support forums for suggestions.

 

[srkrono]

so i have them at 10-11-10-30 @ 1.65v, that wont fry my ram will it?

 

[JackNaylorPE]

I'm not familiar with that set so hard to suggest what might work is best left to users with specific experience....but no loosening timings makes it slower, that's it.

 

[Tradesman1]

Initially try them at spec timings, then set DRAM voltage to 1.57 and raisie CPU/NB voltage to about 1.29

 

[srkrono]

so i think i figured out the problem, one set is Rev 4.13 and the other is Rev 8,22

damn!

the rev 8.22 has a tRC of 36 and the 4.13 has a tRC of 48

guess ill be sending one set back 🙁

 

[JackNaylorPE]

I'd send both back saying they "weren't matched" and get a 2 x8 set .... if you bought both at same time, there's a reasonable expectation that they would be "the same".....if you bought one and then another ayear later, yu would be SoL.

 

[Tradesman1]

Amazon might do something, though the manufacturers generally guarantee by the packaged sets as they can be constantly changing individual models as to the components used, they generally guarantee by the individual set, which is why they offer such a variety of sets