Memory not running at the correct speed, so I need help

berlin88 · Dec 2, 2015

I just got some G.skill 16GB (2x 8GB) 1866 memory for my Asrock 990FX Extreme4 motherboard, but Bios only reads the memory at 1333 speeds. How do I get it to read my memory at the correct speed?

Computer Specs:

Antec 1200
Corsair 650W PSU
Asrock 990FX Extreme4
EVGA GTX 660
16GB G.Skill memory DDR3 1866 PC3 14900 (2x 8GB)
LG Blue Ray drive

Tzn · Dec 2, 2015

enable XMP profile in bios but i think that at that speed you need to overclock the ram to work at that speed.

Guest · Dec 2, 2015

Enable XMP profile then, you have to go into your BIOS and manually set the ram speed to 1866! Hope this helps!

Tradesman1 · Dec 2, 2015

What CPU? Not all AMD CPUs can run 1866

berlin88 · Dec 2, 2015

Tradesman1 :

My AMD CPU is an FX-8320 3.5GHz.

I went into Bios and changed the speed from auto to 1866 and then changed the other list from auto to XMP Profile 1.

It gave me a choice between XMP Profile 1 and XMP Profile 2. Not sure what the difference was, so I just selected XMP Profile 1.

That solved the initial problem of my memory showing up as 1333 instead of 1866.

However, I discovered a second problem. Windows shows 16GB of memory, but says only 7.96GB is useable. Is there some other setting a need to change, so that all 16GB is usable?

Tradesman1 · Dec 3, 2015

8320 should be good to go

Profile 1 is the better option (stock), Profile 2 is slightly better performance wise (normally drops the CR to 1T from 2T). On the 8 available, can try raising the CPU/NB voltage to say 1.25 - it also may be the CPU cooler if third party, might be too tight in a corner or side, try loosening it and then snug it back down to screw tight

berlin88 · Dec 3, 2015

Tradesman1 :

EDIT: All Problems have been solved

My memory sticks were in slots A2/B2 instead of A1/B1. Switched the slots, and dual channel mode worked just fine, and Windows no longer gives me the message of 7.96GB out of 16 being usable.

Guest · Dec 3, 2015

Glad it worked

Zentropa · Dec 9, 2015

Tradesman1 :

8320 should be good to go

Profile 1 is the better option (stock), Profile 2 is slightly better performance wise (normally drops the CR to 1T from 2T). On the 8 available, can try raising the CPU/NB voltage to say 1.25 - it also may be the CPU cooler if third party, might be too tight in a corner or side, try loosening it and then snug it back down to screw tight

I have an FX9590, 16GB G.SKill Ares 2x8gb, Crosshair Formula Z etc. Would you recommend profile 2 for this? I have never gotten my memory's frequency above 666MHz despite endless tries, though I think after today's hours of perusing these forums I have some ideas to try when I get home from work. What's strange is I threw in two 8GB sticks of PNY gaming memory at a far lower frequency, which showed up at 998MHz in CPU-Z, but went down from 7.9 to 7.8 in windows experience rating (not that it's exactly a reliable source, not even a little, but it's hard to ignore)... What the hell ever happened to plug and play memory? Building a computer is enough work, but having to "program" my memory to work the way it's supposed to? FRUSTRATING.

Sonnybu42 · Dec 15, 2015

But... ASRock tells you specifically to use A2 & B2 slots for anything higher than 1600... What's up with that?

Tradesman1 · Dec 15, 2015

Zentropa :

Tradesman1 :

8320 should be good to go

Profile 1 is the better option (stock), Profile 2 is slightly better performance wise (normally drops the CR to 1T from 2T). On the 8 available, can try raising the CPU/NB voltage to say 1.25 - it also may be the CPU cooler if third party, might be too tight in a corner or side, try loosening it and then snug it back down to screw tight

I have an FX9590, 16GB G.SKill Ares 2x8gb, Crosshair Formula Z etc. Would you recommend profile 2 for this? I have never gotten my memory's frequency above 666MHz despite endless tries, though I think after today's hours of perusing these forums I have some ideas to try when I get home from work. What's strange is I threw in two 8GB sticks of PNY gaming memory at a far lower frequency, which showed up at 998MHz in CPU-Z, but went down from 7.9 to 7.8 in windows experience rating (not that it's exactly a reliable source, not even a little, but it's hard to ignore)... What the hell ever happened to plug and play memory? Building a computer is enough work, but having to "program" my memory to work the way it's supposed to? FRUSTRATING.

_________________

Can experiment with it, most are better off with profile 1, AMD doesn't really have a good MC (memory controller) might want to raise the CPU/NB voltage (it feeds the MC) to about 1.25

Tradesman1 · Dec 15, 2015

It should work in either 1-3 or 2-4 from CPU, but doesn't always

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Memory not running at the correct speed, so I need help

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