Mismatched speed.

Uncle Petey · 23 Dec 2013 at 16:03

Hi guys, I'm running 4x4Gb of 1600mhz Avexir Core ram (actually, 2x4Gb Avexir Core and 2x4Gb Avexir M-Power) and have set DRAM target to 1600mhz in the bios (Asus P8Z77-V).

It seems that the two sticks in the middle only run at 1333Mhz (667), while the two on either end run at 1600mhz (800). Apart from two being labelled M-Power, all the sticks should be the same thing afaik.

Any idea what I can do to sort this out?
Performance is fine, but y'know?

wazza300 · 23 Dec 2013 at 18:19

where are you looking to see the speeds for each module? in cpu-z?

don't get confused with standard speed

tested with each kit separately to see if they do actually run at 1600mhz? and tried with touch more vccio voltage from stock 1.05v,maybe 1.08-1.15v region

Uncle Petey · 23 Dec 2013 at 18:27

It's being reported in my firestrike bench report.

They both run at 1600 in their own pairs and the situation was the same on my last mobo.
I started with the M-Power ones when they were the only avexir ram available here and added the the other pair later.

Not tried any extra voltage.

wazza300 · 23 Dec 2013 at 18:35

idk other than a firestrike bug?

does cpu-z memory tab show correct speed/timings? idk if hardware monitor would show each sticks current speed

touch more vccio/vccsa might cure it but I don't think ive ever seen ram running at different speeds together,usually its the fastest/slowest speed of all the ram installed

Uncle Petey · 23 Dec 2013 at 18:49

Maybe, though other user benches are showing things running evenly.

Do these shed any light?

wazza300 · 23 Dec 2013 at 18:59

yeah lookslike its showing/detecting the max bandwidth of each ram kit,and not the actual speeds

heres mine look,1600mhz max bandwidth rated yet im overclocked to 2133mhz

id guess at firestrike system info picking up the max bandwidth of each kit and not the actual speed

heres 3dmark showing ram 800mhz (max bandwidth) yet it was clocked at 2133mhz http://www.3dmark.com/3dm11/3450757

you sure one kit isn't 1333mhz?

Uncle Petey · 23 Dec 2013 at 19:09

I'll pop out the sticks and try them in pairs again. They all need to be set to 1600 from a default of 1333 if that means anything?

I'd be a bit peeved if one kit was 1333 as they were advertised as 1600. RMA/replacement time, if so.

wazza300 · 23 Dec 2013 at 19:12

yeah that's normal,but xmp profile might support 1600mhz

I think its not reading the one kits true speed correctly and reading the standard default (1333mhz) speed

the actual cpu-z memory tab looks ok with correct speed/timings

Uncle Petey · 23 Dec 2013 at 19:19

I think you're right. I've just got the two M-Power sticks in dual channel now and the main memory tab says 800 (799.9) and the SPD tab says 667 in the box.

Looks like we're all good. Thanks for the help