[tbresson]

Hi.

I had some issues with my PC resulting in a CMOS reset and I can't remember how to set up my RAM timings as they were.

MB: ASUS P6X58D-E
CPU: INTEL i7 950 3,06 GHz
RAM : CORSAIR 6GB DDR3 INTEL I7 DOMINATOR GT 2000MHZ CL8 (CMT6GX3M3A2000C8)

Initially the RAM speed is 1066 MHz but as my RAM is able to go faster I thought I could change some values in BIOS to make them go faster. Ufortunately my PC doesn't seem very stable when I try and fiddle with the BIOS settings. So I need help.

From what I've learned the supported speed is 1066 MHz hence the default value I guess so when I change the values it's considered overclocking (one of my ASUS programs tells me that).

I tried entering the BIOS sections "DRAM Timing Control" and enter:
DRAM CAS# Latency: 8
DRAM RAS# to CAS# Delay: 9
DRAM RAS# PRE Time: 8
DRAM RAS# ACT Time: 24

Everything else is on AUTO - but nothing changed - perhaps because the Ai Overclock Tuner is on AUTO aswell.
Both my board and my RAM supports X.M.P. so I tried the X.M.P. profile: X.M.P. Profile Info: 2000MHz-8-9-8-24-2N-1.65V-1.25V
My PC fails the memtest after about 2 loops (1½ hours) - one time leading to a corrupt BIOS. And Prime95 crashes almost instantly.

I then tried lowering the BCLK value so my CPU reached a more accurate frequency and memtest was stable after this but Prime95 still crashes - just not at once.

I then heard that setting the Ai Overclock Tuner to MANUAL is better than the X.M.P. profile even if the values are the same. I tried this but the Prime95 stille crashes .. well it frooze my Windows.

I tried using this article: http://vip.asus.com/forum/view.aspx?id=20081220191040237&board_id=1&model=P6T+Deluxe&page=1&SLanguage=en-us but I'm having a hard to understanding what does what and I'm affraid to fry the CPU or similar.

I'm hoping someone can help me - perhaps if you have a similar system (se hardware in the top).

These are my BIOS settings when on X.M.P. profile:

BIOS INFO:
X.M.P. Profile Info: 2000MHz-8-9-8-24-2N-1.65V-1.25V

CPU Ratio Setting: 22.0
Intel(R) SpeedStep(TM) Tech: Enabled
Xtreme Phase Full Power Mode: Auto
BCLK Frequency: 143
PCIE Frequency: 100
DRAM Frequency: DDR3-2006MHz
UCLK Frequency: Auto
QPI Link Data RAte: Auto

CPU Voltage Control: Manual
CPU Voltage: Auto
CPU PLL Voltage: Auto
QPI/DRAM Core Voltage: 1.40000 (PINK)
IOH Voltage: Auto
IOH PCIE Voltage: Auto
ICH Voltage: Auto
ICH PCIE Voltage: Auto

DRAM Bus Voltage: 1.65 (RED)
DRAMA DATA REF Voltage on CHA: Auto
DRAMA CTRL REF Voltage on CHA: Auto
DRAMA DATA REF Voltage on CHB: Auto
DRAMA CTRL REF Voltage on CHB: Auto
DRAMA DATA REF Voltage on CHC: Auto
DRAMA CTRL REF Voltage on CHC: Auto

Load-Line Calibration: Auto
CPU Differential Amplitude: Auto
CPU Clock Skew: Auto
CPU Spread Spectrum: Auto
IOH Clock Skew: Auto
PCIE Spread Spectrum: Auto

DRAM Timing Control:
1st Information: 8-9-8-24-7-98-14-8-28-0 (GREY)
DRAM CAS# Latency: Auto
DRAM RAS# to CAS# Delay: Auto
DRAM RAS# PRE Time: Auto
DRAM RAS# ACT Time: Auto
DRAM RAS# to RAS# Delay: Auto
DRAM REF Cycle Time: Auto
DRAM WRITE Recovery Time: Auto
DRAM READ to PRE Time: Auto
DRAM FOUR ACT WIN Time: Auto
DRAM Back-To-Back CAS# Delay: Auto
2nd Information: 2N-61-62-62 (GREY)
DRAM Timing Mode: 2N
DRAM Round Trip Latency on CHA: Auto
DRAM Round Trip Latency on CHB: Auto
DRAM Round Trip Latency on CHC: Auto
3rd Information: 7-7-19-9-9-9-7-6-4-7-7-4 (GREY)
DRAM WRITE To READ Delay(DD): Auto
DRAM WRITE To READ Delay(DR): Auto
DRAM WRITE To READ Delay(SR): Auto
DRAM READ To WRITE Delay(DD): Auto
DRAM READ To WRITE Delay(DR): Auto
DRAM READ To WRITE Delay(SR): Auto
DRAM READ To READ Delay(DD): Auto
DRAM READ To READ Delay(DR): Auto
DRAM READ To READ Delay(SR): Auto
DRAM WRITE To WRITE Delay(DD): Auto
DRAM WRITE To WRITE Delay(DR): Auto
DRAM WRITE To WRITE Delay(SR): Auto

According to CPU-Z (v. 1.60.1.x64):
General:
Type: DDR3
Size: 6144 MBytes
Channels#: Tripe
DC Mode: (GREY)
NB Frequency: 3829.8 MHz

Timings:
DRAM Frequency: 957.5 MHz
FSBRAM: 2:14
CAS# Latency (CL): 8.0 clocks
RAS# to CAS# Delay (tRCD): 9 clocks
RAS# Precharge (tRP): 8 clocks
Cycle Time (tRAS): 24 clocks
Row Refresh Cycle Time (tRFC): 98 clocks
Command Rate (CR): 2T
DRAM Idle Timer: (GREY)
Total CAS# (tRDRAM): (GREY)
Row To Column (tRCD): (GREY)

 

[Blameless]

DDR3-2000 is going to be very difficult to stabilize on an i7 950.

The Bloomfield IMC requires that you run your uncore clock at a minimum of double the DDR rating of the memory if you are using tri-channel mode. Most Bloomfields do not react well to a 4GHz uncore clock, at least not without very good cooling and massive (often unsafe) QPI/VTT voltage. Even the lower speed you are attempting (3.83Ghz uncore and DDR3-1914) are probably pushing it.

XMP is also hit or miss, and you are right to be using manual timings.

One more issue is that, in general, Bloomfieds don't OC well on even CPU multipliers. I''d recommend using 23x or 21x, rather than 22.

 

[tbresson]

Thanks for the reply

I guess I didn't research well enough when I bought my parts. I am using tri-channel mode.
I have a CM Startrooper case so the overall cooling should be okay but the CPU and RAM coolers are stock I believe it's called

It appears the default CPU Multiplier is actually 23 (but can go to 24).

Do you have any suggestions where I might find a stable state between 1066 and 2000 MHz? Trial an error perhaps?

 

[divide_by_zero]

1600 should be easy to hit but at lower speeds you can usually have better timings. My GSKILL tri-channel kit had a stick go bad, probably some time ago, because I ran it at 1333/8-8-8-24 for a bit with no problems. It ran at 1600 for just under two years.

If you can't get it stable above 1333 try default, stable settings and memtest each stick. If one stick can be isolated as defective you'll be able to assume RAM is causing the issue with a fair amount of certainty. Then, just RMA the kit imo.

Sent from my iPhone using Tapatalk

 

[tbresson]

I would be content in a way to run at 1600 MHz - it's better than default.
I guess I'll have to try out some varians. The default works. I havn't had any fails on MemTest or Prime95. Although I only ran MemTest for about 1½ hours, maybe more and Prime95 for a few minutes.

Perhaps I shoudl aim for 1600 and then let Prime95 do an overnight test if it seems stable.