Dual Channel 4 sticks Gskill Ripjaws

matthew_nicho2 · Nov 28, 2016

Hi all,

PC specs in my sig!

I had 2x4GB sticks running dual channel for 4 years, no problem, and decided to add another 2x2GB sticks. Same brand, same model and same speed. The only difference is their size and age.

My old 2x4GB sticks are in dual channel but I cant get the 2x2GB sticks to dual channel. I have been using them like this for a few days and memtested and its been fine so I think it's not a voltage problem. The only thing I can see being a problem is the size difference (8 and 4).

Is there a way to get the dual channel working? or is there a reason its not working that I have overlooked?

I used CPUID to get the channel information.

Any help appreciated, cheers!

ingtar33 · Nov 28, 2016

dont mix and match ram; doesn't work

matthew_nicho2 · Nov 28, 2016

Its working fine just not in dual channel.

Tradesman1 · Nov 28, 2016

Try the 4GB in slots 1-3 and the 2GB in slots 2-4 and might raise DRAM voltage + 0.05

matthew_nicho2 · Nov 28, 2016

I will try voltage first. The C14 covers my ram so I have to take the thing off completely to get at it. Its a pain.

back in 10ish mins

Tradesman1 · Nov 28, 2016

No worries - will be around

matthew_nicho2 · Nov 28, 2016

The bios now says the DRAM at 1.56v but no change.

I am looking at the correct thing in CPUID? On the SPD page, Ranks. My 2x4gb are "dual" and 2x2 are "single". That is dual and single channel right? because the Memory page says "Dual" in the "channel #" box.

Tradesman1 · Nov 28, 2016

Look at the memory tab, upper right, it will tell you single or Dual. SPD tab is nothing more than the info off each single stick

So, yes you are in Dual

matthew_nicho2 · Nov 28, 2016

Doh! I saw single and dual on the SPD page and took them for channels. It states dual on the Memory tab so everything's good.

Thanks for your help!

p.s. For all of the horror stories you hear about mixing ram is there any truth to it? Because I was expecting BSODS and tweaking the voltages of the ram, mc and nb.

Tradesman1 · Nov 28, 2016

Oh God yes, we see so many repetitive threads about mixing DRAM, what DRAM can I use, your question on CPU-Z, etc. I wrote a couple of articles for TomsHardware - FAQs and Fiction about DRAM - can get links to both here:

http://www.tomshardware.co.uk/answers/id-2741495/ddr3-faqs-fiction.html

I usually use or play with 20 or more sets a month in my business and on my rigs and run into it all the time. Take a look at items 2 and 6 in the Myths article for a little more info

matthew_nicho2 · Nov 28, 2016

I just skimmed the articles; alot of in depth information there! Will definitely give that a read, Thanks.

I guess I got lucky, its about damn time

For future information then: -

MB: Gigabyte GA-970A-UD3P
CPU: FX 8350
RAM:-
G.Skill F3-12800CL9D-8GBXL
G.Skill F3-12800CL9D-4GBXL

Logical/Chipset Memory Banks
Bank 0 : 4GB DIMM DDR3 9-9-9-24 5-40-12-6 4T
Bank 1 : 2GB DIMM DDR3 9-9-9-24 5-40-12-6 4T
Bank 4 : 4GB DIMM DDR3 9-9-9-24 5-40-12-6 4T
Bank 5 : 2GB DIMM DDR3 9-9-9-24 5-40-12-6 4T
Supported Memory Types : ECC DIMM Registered DDR3
Channels : 2
Width : 128-bit
Memory Bus Speed : 2x 800MHz (1.6GHz)
Multiplier : 8x
Integrated in Processor : Yes
Cores per Memory Controller : 8 Unit(s)
Fixed Hole Present : Yes
Maximum Memory Bus Bandwidth : 25GB/s

Compatible: Check!

Thanks again!

Tradesman1 · Nov 28, 2016

No worries

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Dual Channel 4 sticks Gskill Ripjaws

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