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Overclocking EP45T-USB3P, Q9550, 8GB ram

post #1 of 4
Thread Starter 
I haven't been able to find a thread on overclocking with this board that was relevant to my interests, so I hope that this thread won't be deleted before I can get some help with my OC'ing.

Ok, here's the specs:
EP45t-USB3p
Q9550 @ 2.83Ghz
8GB Ocz Platinum 1333Mhz

I have been trying to overclock on this board for as long as I have had it, and I have not been successful in getting a stable oc. This is very disappointing as I have heard stories about people getting Q9000 series cpu's up to 4Ghz+ with this board.

I am a bit of an amateur, and if anyone has a guide for the EP45t bios that is better than the Gigabyte manual, that would be excellent.

Stock clocks:
CPU @ 2.83Ghz (333Mhz x 8.5)
RAM @ 1333Mhz (7-7-7-20 timing, although its supposed to do 7-7-7-16 at 1066)

Voltages:
CPU @ 1.232V (CPU-z)
MCH @ 1.1V (the bios says so)
RAM @ 1.66V (Bios thought it should be 1.75, ram is rated at 1.65, but the bios only goes in even numbers so I figured over is better than under)

Moderate overclock:
CPU @ 3.15Ghz (370Mhz x 8.5)
Ram @ 1184Mhz (8-8-8-21 - set by me because it was crashing)

Overclocked voltages:
CPU @ 1.268V (CPU-Z says 1.248V though)
MCH @ 1.30V
RAM @ 1.66V

My issue is that this will seem stable, run benchmarks for hours with no problems, ran memtest with no errors, furmark is fine, etc. Linpack got the cpu up to about 60C but that was it. However, I get bluescreens every now and then which is driving me mad.

Earlier I had the cpu clocked to 3.4Ghz with similar results - no errors, artifacts, overheating of any kind. However, playing a game half an hour would either crash the game or give me a bluescreen. I've had this issue with a previous board that was less popular and I never got help with it.

What is my recommended course of action - should I be tweaking more settings in the bios? To me, it looks like my ram is actually rated for 1066Mhz instead of the 1333Mhz it says right on the side of the ram. Every time I let it go above, it seems to mess with them. However, when it is running @ stock it sits at 1333Mhz with no issues. What the hey is this?

Update: After lurking the internet for a few hours, I have found a possible solution. A guide on a similar EP45T motherboard suggested increasing tRFC from 60 to 80 (no clue what that does but ok), and changing the Command Rate from 0 to 2. They also said to disable write leveling and write training for both memory channels. What the hey does all this mean? I currently have them all changed and nothing bad has happened so far - but then again it was only crashing every few hours.
Edited by Jivix - 3/12/11 at 1:19pm
post #2 of 4
Im guessing you have 4x 2GB sticks? The extra RAM will add more strain to the northbridge.. You may need to bump up the voltage or take two sticks out...

Are you putting in the voltages manualy? As 2.268V is a death sentence for your chip... I wouldn't set it above 1.45v.

Have you flashed your BIOS to the latest version?
 
Fun inside...
(17 items)
 
 
CPUGraphicsRAMHard Drive
Athlon 64 3500+ 2.2Ghz 9800GX2 (wet) 1998Mhz Shader 4.5GB mixed WD Caviar black 20GB 'SS' 
Optical DriveCoolingOSMonitor
Cheap beige DVD ROM Koolance full copper GX2 block Vista 32bit LG W2486L 
PowerCase
Antec EA650 Antec 900 
CPUMotherboardGraphicsRAM
I7 920 D0 P6X58D-6 [Full mosfet/Northbridge blocks) GTX480 3x 2GB Dominator 1600Mhz 8-8-8-24 
Hard DriveHard DriveHard DriveOptical Drive
M4 64GB WD Green 1.5TB 2x WD CB 640GB Lite-on 22x dual layer, ASUS Blu-ray 
CoolingOSMonitorKeyboard
Custom loop Windows 7 64 bit LG W2486L Microsoft (cheapest they had) 
PowerCaseMouseMouse Pad
Corsair TX950 Lancool PC-K62 Microsoft X5 Akira theme 
Audio
Logitec 5.1 
MotherboardRAMHard DriveOptical Drive
EVGA P55 2x 2GB Corsa 2133MHz 250GB DVD-RW 
CoolingOSMonitor
Air Vista Business 32bit 17" 
  hide details  
Reply
 
Fun inside...
(17 items)
 
 
CPUGraphicsRAMHard Drive
Athlon 64 3500+ 2.2Ghz 9800GX2 (wet) 1998Mhz Shader 4.5GB mixed WD Caviar black 20GB 'SS' 
Optical DriveCoolingOSMonitor
Cheap beige DVD ROM Koolance full copper GX2 block Vista 32bit LG W2486L 
PowerCase
Antec EA650 Antec 900 
CPUMotherboardGraphicsRAM
I7 920 D0 P6X58D-6 [Full mosfet/Northbridge blocks) GTX480 3x 2GB Dominator 1600Mhz 8-8-8-24 
Hard DriveHard DriveHard DriveOptical Drive
M4 64GB WD Green 1.5TB 2x WD CB 640GB Lite-on 22x dual layer, ASUS Blu-ray 
CoolingOSMonitorKeyboard
Custom loop Windows 7 64 bit LG W2486L Microsoft (cheapest they had) 
PowerCaseMouseMouse Pad
Corsair TX950 Lancool PC-K62 Microsoft X5 Akira theme 
Audio
Logitec 5.1 
MotherboardRAMHard DriveOptical Drive
EVGA P55 2x 2GB Corsa 2133MHz 250GB DVD-RW 
CoolingOSMonitor
Air Vista Business 32bit 17" 
  hide details  
Reply
post #3 of 4
Thread Starter 
Oops, I apologize... I meant 1.268V. I guess CPU-Z's measurement is off more than I thought it was.

Also, I bumped up the northbridge from 1.1V stock to 1.3V. I was recommended to not go above 1.45V for this board, and that 1.35V would be excessive anyways for 8GB.

Also, I just ran Prime95 all night and there was no issues. I really wish that would tell me that my computer would work 100%.

I changed the original post to make it a bit easier to read. I will play some more games today to make sure it is actually working.
Edited by Jivix - 3/12/11 at 1:22pm
post #4 of 4
Thread Starter 
Hi folks. I got another bluescreen while playing TF2 yesterday, nearly crapped myself when my audio hung. Interesting that the computer can't handle TF2 for more than half an hour but it can handle Prime95 for 8 hours and Linpack for 8 hours without breaking a sweat. It can handle Furmark for over an hour (I didn't bother testing past this).

I loosened my memory timings even more, so now it is 9-9-9-21 at 1184 Mhz. I haven't tried playing Tf2 yet but I will tonight.

I have always wanted to get into overclocking but every time I do I hit some ridiculous wall like this. I have never overclocked something that didn't post and didn't handle benchmarks but they always fail on me in some other way. It's been this way the last few machines I've owned. It's getting on my nerves.
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