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DDR3 DRAM Frequency

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Anonymous
a b } Memory
June 28, 2011 5:22:33 PM

Hello, I've just bought a kit of two DDR3 12800 modules, mounted in Dual Channel. Here are two screenshots from CPU-Z. Can you tell me if something's wrong with the frequencies please ?


More about : ddr3 dram frequency

a b } Memory
June 28, 2011 5:38:36 PM

You are running at 10700 (1333) which is normal for motherboards to default to. The easiest way to get it to run at 12800 (1600) is to load the xmp. In the bios there should be a ram configuration section and an option to load profile. Just load the xmp, save and exit.
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Anonymous
a b } Memory
June 28, 2011 5:42:52 PM

Okay... What is the xmp ? I tried to select manually 1600 MHz in the bios, but I got a blue screen at the opening of Windows 7 64bit. By the way, I've got an AMD Athlon X3 450 running on an Asus M4N75TD.
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Related resources
a b } Memory
June 28, 2011 6:14:55 PM

XMP=extreme memory profile, basically a saved set of options. I know you don't know much about OC which is why I said to just load the xmp.
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a c 347 } Memory
June 28, 2011 6:18:52 PM

Welcome to Toms Forums! :) 

Your CPU is borderline if not incapable running 1600 MHz. Also, the XMP is an Intel only setting to the AI OC Tuner; No AMD MOBO can set 'XMP' in to the BIOS.

Here's a couple links for FYI
L1 - http://www.tomshardware.com/forum/292927-30-manually-me...
L2 - http://www.tomshardware.com/forum/289583-30-cant-ddr3-1...

That all said, do the following {a/k/a Try}:

BIOS
AI Overclocker Tuner -> DOCP
DRAM OC Profile -> DDR3-1600MHz
DRAM Timining Control /Enter
DRAM CAS# Latency -> 8
DRAM RAS# to CAS# Delay -> 8
DRAM RAS# PRE Time -> 8
DRAM RAS# ACT Time -> 24
-
DRAM Command Rate -> 2N
--
DRAM Voltage -> 1.65v

Save & Exit = Yes

Note: if that fails then you're going to have to OC the FSB -> 240 MHz
Note: if it Runs w/o BSOD then congrats! Next create a bootbale CD/DVD of Memtest86+, use the ISO/zip file and run at least 2 if not 4 passes -> http://www.memtest.org/

Good Luck! :) 
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a b } Memory
June 28, 2011 6:31:34 PM

Sorry I know about the AI OC tuner but did not know xmp was an intel thing. I guess I should just stick to helping intel poeple. :sweat: 
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a c 347 } Memory
June 28, 2011 6:45:32 PM

Most don't, it's the 2nd time to day. No biggie. I learn something new every day ;) 
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a c 108 } Memory
June 28, 2011 6:56:01 PM

What is your problem?

If everything is running, then be done with it; no need to fiddle with settings.
I see nothing wrong with the displays.

The first tells you what the ram is, and several valid configuration settings.

The second tells you what the bios selected.

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a c 347 } Memory
June 28, 2011 7:06:25 PM

Clean themz glasses the running speed is 1333 (666.7*2), and RAM is Rated 1600 MHz. The top image is the JEDEC + Intel Freq/CAS/voltage, and the second is the Freq/CAS/voltage it's running now.

So wrong in that it's not running as the OP paid for, right only in the sense it's running.
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Anonymous
a b } Memory
June 28, 2011 8:11:14 PM

Thank you for your answers. I did everyrhing as Jaquith said in the BIOS. And now I got this :



Nevertheless, when I manually select the RAM frequency at 1600 MHz after having selected the DRAM OC Profile for DDR3 1600, I get a blue screen shortly after my Windows session opens. So right now, the RAM freq is on Auto in the BIOS.
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a c 347 } Memory
June 28, 2011 8:26:26 PM

3:10 means 'FSB = 200 Mhz'

from above ---> "Note: if that fails then you're going to have to OC the FSB -> 240 MHz "
from above ---> "Your CPU is borderline if not incapable running 1600 MHz"

edit:
You also need to lower the CPU Multiplier -> 12
X3 450 2800MHz
2800 / 200 = 14
2800 / 240 = 11.67 closest is12

12 * 240 MHz = 2880 MHz = 2.88GHz ; no vCore adjustments needed {CPU Voltage}
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Anonymous
a b } Memory
June 28, 2011 8:56:36 PM

Ok. My Athlon II X3 450 is 3.2 GHz. There's nowhere written FSB in my BIOS, just CPU Bus, that I can set to 240. Then, the RAM is indeed at 1600 MHz, and I lower the multiplier in order to have a CPU freq of 3240 Mhz. Then, same thing, blue screen shortly after the Windows' session's opening. I ran the full mem test you talked about, without any problem found. What can I do now ?
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a c 347 } Memory
June 28, 2011 9:45:08 PM

CPU Bus is FSB. This seems more like a bad CPU OC.

See -> http://www.overclock.net/intel-cpus/869018-intel-amd-gf...

IMO the CPU OC is 'barely' stable if you can run RAM at 1333 MHz, and the RAM at 1600 MHz is pushing it over the edge.

First try CPU Multiplier -> 12 <OR> increase vCore -> ~1.5+v trial + error {CPU Voltage}. Figure out where the problem is first, and running 3.2GHz + 1600 MHz either can be the root cause. You need to make certain one at at time that both can work individually then combine.

Q - What's your vCore at 3.2GHz?

---

'IF' you are getting into Widows and getting a failure once the OS is loading/loaded then start looking in Widows, run MSCONFIG, select Diagnostic and restart. If Diagnostic works then you've got a conflict in Windows.
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Anonymous
a b } Memory
June 28, 2011 9:53:02 PM

at 3.2 GHz, the vCore = 1.376

I'm not sure I crearly understand what you want me to do with the CPU. Could you please explain it a little more ?
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a c 347 } Memory
June 28, 2011 10:04:21 PM

If it's bombing when you do BOTH 1. 3.2GHz & 2. 1600 MHz DRAM then try raising the vCore. Start with vCore -> 1.4+v.
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Anonymous
a b } Memory
June 28, 2011 10:11:43 PM

Okay, I get it now :)  But... how much should I add safely ? 1V or 0.1V ?
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a c 347 } Memory
June 28, 2011 10:25:52 PM

I'd start with 1.45v and work my way down until failure then add +0.02v~+0.05v, and there's no way for me to guess your magic vCore. If I took 10 identical sets-ups I'd have 10 different magical vCores.
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a c 347 } Memory
June 28, 2011 10:36:43 PM

Also, try NB Voltage -> 1.20v~1.25v~1.30v that might help. Try each, start with 1.30v and work down.
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Anonymous
a b } Memory
June 28, 2011 10:50:15 PM

I tried three setups so far : The RAM was always at 1600 MHz (so FSB=240). 1) Multiplier at 12, no voltage change = blue screen 2) Multiplier at 13.5 (so 3.2 GHz), vCore = 1.4 = blue screen 3) Multiplier at 12, vCore at 1.4 = blue screen. I'm beginning to be in despair... Should I try to start the RAM freq at 1333 and then going up step by step until blue screen, all this without any change in voltage and CPU freq ?
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a c 347 } Memory
June 28, 2011 11:03:51 PM

One last 'clean' try for 1600 MHz.

BIOS
Load Defaults

SATA Mode -> AHCI

CPU Bus -> 240 MHz
CPU Ratio -> 12

AI Overclocker Tuner -> Manual
DRAM OC Profile -> DDR3-1600MHz
DRAM Timining Control /Enter
DRAM CAS# Latency -> 8
DRAM RAS# to CAS# Delay -> 8
DRAM RAS# PRE Time -> 8
DRAM RAS# ACT Time -> 24
-
DRAM Command Rate -> 2N
--
DRAM Voltage -> 1.65v
NB Voltage -> 1.30v

Save & Exit = Yes

If you get into Windows then check the 'Start' values = 0 manually or via Fix It; see -> http://support.microsoft.com/kb/922976

Yep, I'd hang my hat if that fails and run 1333 MHz with you CPU OC. The reality is 1333 vs 1600 is 1~2% difference, and the CPU OC is more important.
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a c 108 } Memory
June 28, 2011 11:05:06 PM

I suggest you start the ram at 1333.
And... stop there.

You will have a stable working PC.

How much more real application performance do you expect if you can get the ram to 1600?
It will do so, perhaps, at the expense of increased latencies and higher voltages.
The net result will be better synthetic ram benchmark numbers, but virtually no improvement in real application performance or FPS.
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