amd fx cpu and memory ranks

fivefootwall

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Jan 27, 2016
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Having spent several hours to no avail, here goes: I had two 4gb Adata ddr3's that died and sent off under warranty. While waiting I replaced them with two 4gb Corsair CMZ8GX3m2A1600C9, which are running fine at 1600 C9 in dual channel mode in the same color slots on my Gigabyte 970A-UD3P board. So now months down the road, Adata sends me back two 4gb AX3U1600C4G9-DR sticks of DDR3. AMD says that if I populate all 4 slots with dual rank ram, then my FX-6100 running at 3.8ghz stable will only run my ram at 1333. Not good.

http://support.amd.com/en-us/kb-articles/Pages/ddr3memoryfrequencyguide.aspx

So what to do? Should I stick these Adata into the empty slots? Will the ram really run slower? Or are these single rank ram sticks, and will run fine at 1600? Or is the AMD article out of date?

FYI - My system is part of a recording studio DAW, and is inside a quiet case, which means it is not an easy task getting into the computer case, cuz its inside another case with a bunch of wires coming out of it. I'd rather avoid experimenting if at all possible, both because I am lazy and because I don't want to break anything expensive.
 
Solution
^ not true
I'd say there's s very very good chance of running those 4 sticks in dual channel at 1600mhz .

They're all single sided nand sticks so ignore that amd article completely.

You may have to tinker with timings in bios a little - absolute worse case scenario IMO is you end up with single channel 1600 or dual channel 1333
I would still take the extra ram capacity even in those cases though.

fivefootwall

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I don't understand. All 4 sticks, the Corsair and the Adata, are DD3 1600. The question I am asking is if I stick the two 4gb Adata into the two open slots, upping my 8gb to 16gb, will the RAM speed drop from 1600 to 1333 as per AMD.
 
^ not true
I'd say there's s very very good chance of running those 4 sticks in dual channel at 1600mhz .

They're all single sided nand sticks so ignore that amd article completely.

You may have to tinker with timings in bios a little - absolute worse case scenario IMO is you end up with single channel 1600 or dual channel 1333
I would still take the extra ram capacity even in those cases though.
 
Solution

fivefootwall

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Jan 27, 2016
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On my previous MB, a Gigabyte 970a-DS3, with a Phenom II 945 running at stock, I was able to run two sticks of 4gb and two sticks of 2gb at 1600 9-9-9-24 for couple years (12gb total ram). All that ram was on Gigabyte's compatible ram list; these new Adata sticks aren't, but that is likely because Gigabyte isn't going to test new ram for existing 970-based motherboards. The reason Adata sent me two 4gb sticks was because one of the 2gb Adata sticks took a dump, and Adata didn't have any legacy 2gb sticks. In Adata's defense, realize that those two 2 gb sticks were a pull from a XP system, that were installed so long ago I don't have a clue. 2008?

I guess the answer is if I want to see if I can run all four 4gb sicks at 1600 9-9-9-24 at 1.5V is to experiment. Bummer.
 

Tradesman1

Legenda in Aeternum

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?????????? If it can handle the settings, it will run at that - it won't downclock it. If this was true, then no one could run dual channel at spec, yet people do all the time.