Mixed memory

L

LM3

[H]ard|Gawd
Joined
Mar 21, 2004
Messages
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In my main machine I have:



2 sticks Corsair PC3-8500F

1 stick G.Skill PC3-12800

1 stick Hyundai PC3-12800



All are 4 gig.

The Corsair are XMP memory and my board automatically overclocks them to XMP-1600 by increasing the voltage. They show 800mhz with a CAS of 9.0.

The G.Skill is XMP memory but runs at stock voltage of 1.5. I shows XMP-1600 at 800mhz with a CAS of 9.0.

The Hyundai is not XMP memory and runs at stock voltage. It shows JEDEK #6 with 800mhz and a CAS of 11.0.





What should I do?
 
What CPU/board are you using?

So you have 2 sticks of 1066, and 2 sticks of 1600 RAM.

Assuming you are running an older Sandy/Ivy and on an Intel, you will probably see close to 0 improvements running overclocked RAM.

I'd say you can do 3 things:
1. Keeping everything at DDR3-1066 (8500), CAS 9-10
2. Trying for 1600Mhz (12800) at CAS11 and giving the RAM some added voltage - 1.55V?
3. Going for somewhere in between at DDR3-1333, CAS 11 and hope the Corsairs will OC just a little

Option 1 is probably more stable given how your Corsairs are not guaranteed to OC all the way up to 1600.
 
Buy 2 x 8GB sticks of budget DDR3 ram, and have better performance would be my vote. RAM is very affordable still.
 
Well by default most mobos will just downlock to the slowest rated ram, and voltage. The voltage variance will case the instability problem.
 
the Hynix is 1600 cas 11 so should be fine at 1333 cas 9. since the corsair requires over-volting to get to 1600 I would assume it is like my corsair 1600 and will run fine at 1333 with 1.5v. so you should be able to run all of them together at 1333 1.5v cas 9. so start with one stick at 1333 cas 9 1.5v and run memtest or something as you add in the other sticks to make sure they all play nice.
 
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