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Core 2 Duo E6300 on P43 - can't get past 366 FSB?!

post #1 of 10
Thread Starter 
Hi!

I have recently started overclocking my Core 2 Duo E6300 (Allendale, B2). I have a Gigabyte EP43-DS3L board and 4x 2GB of Kingston ValueRAM DDR2-800.

So far I went from FSB 266 to FSB 333, raising the CPU clock to 2.33 GHz (25% OC). I've lowered the memory divider to 2.40 to keep the memory at 800 MHz - it doesn't oc well at all. This setup is absolutely stable without voltage adjustments and stays cool (57°C core #0 max using P95 to stress) with my Zalman CNPS 9500AT.

Now I want to go past 3 GHz CPU clock so FSB 400 seems the next reasonable larger step. To get there, I reduced the memory divider to 2.00 with timings 5-5-5-18-23 as taken from the SPD for 400 MHz FSB. I then slowly increased the FSB up to 366 MHz which is stable albeit somewhat hotter (62°C core #0 max under P95 stress).
However as soon as I go to FSB 375 the system becomes extremely unstable. It bluescreens almost immediately. I raised Vcore from 1.325V to 1.375V and CPU termination Voltage from 1.2V to 1.4V, no effect. MCH to from 1.1V to 1.3V and RAM from 1.8V to 2.0V, no effect. Combined both, no effect. Removed two of the four RAM sticks, no effect.

Now I'm running out of ideas. Why can't I even get to FSB 375 with higher voltages when virtually anyone gets to 400 with no issues. Especially with a B2 E6300 which is said to overclock very well. The Mainboard officially supports FSB 400 and so does the RAM.

If anyone could give some hints as to what else I could try... or shed some light on why this thing isn't going any higher... that would be much appreciated,

Chris
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Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
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post #2 of 10
maybe its not vcore you need?

mch?

pll?

term?

ref?

got any of those voltages?
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post #3 of 10
Thread Starter 
MCH: I raised from 1.1V to 1.3V.
PLL: Hmm, left that stock. Never read it might need to be raised?
Termination: Raised from 1.2V to 1.4V.
Ref: Never read about that one either, do you have any links for me to read up on it?
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Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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post #4 of 10
term just bellow vcore seems to work better for me so i would try 1,4vcore 1.36 term and i think pll should only need about 1.6 but dont hold me to that as its been a while since i playe with an allendale.

1.3v mch i think should be plenty but i guess it depends how good the nb is.

sorry i missed it scanning thru the first post.

if you fill your system spec in the user cp it helps, other wise your going to get a few questions over and over.

like;
what is your psu?
whats is your case?
what heatsink do you have?
do you have any extra cooling in the case?

weak psu and not enough cooling cause alot of crashes when your trying to oc.
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post #5 of 10
Thread Starter 
OK, thanks for the hint. I've filled in system specs as far as I know them right now. The PSU is a 500W "real power" thingy that was fairly expensive so I would hope it can easily cope.
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
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Home PC
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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post #6 of 10
Thread Starter 
I've had a look at the PSU now and it is a CoolerMaster Real Power M520. Am I right in claiming this is a quality PSU?


I tried adjusting CPU termination voltage to 1.36V as you suggested, but the BIOS will only allow 0.1V steps. So I'd either have to go with core = 1.4 and term = 1.3 or have both at 1.4V.... either way, the system is still unstable at FSBs above 366 :-(

I keep removing the second and fourth stick of RAM because I think that might make it stable, then end up putting it back in half an hour later as it doesn't seem to help.
Is there any way to figure out whether the CPU is limiting me or the MCH?
I mean, it surely can't be the RAM itself?! If it has SPD timings for 400 MHz and I am using them?! And I'm not oc'ing it?

If I could at least find out which of the components is blocking me....
Home PC
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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CoolerMaster M520 Big Tower, 120mm fan (back), 3x 90mm fans (front) MS IntelliMouse Optical 
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Home PC
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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post #7 of 10
1. is that psu enough for that 6950? :/

2. doesnt ram show up 1/2 the speed as its running in cpu-z ect ?
    
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post #8 of 10
Thread Starter 
1. I would hope so?! Tell me if I'm wrong. I could remove a couple hard disks to reduce load on the PSU if I have to... but up to now I was thinking my PSU would be the last component to cause trouble.
2. Could be. I think it varies from tool to tool. But I have seen it run at 732 MHz when I was set up with RAM multi 2.00D and FSB 366 MHz. So no, the RAM isn't running at 1600 MHz rather than 800
Home PC
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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CoolerMaster M520 Big Tower, 120mm fan (back), 3x 90mm fans (front) MS IntelliMouse Optical 
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Home PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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post #9 of 10
Thread Starter 
Did some more testing with the settings. Looks like it is the RAM! Here's the thing:

I was testing at FSB 374 MHz with the RAM at 2.0V (that is +0.2) and MCH at 1.3V. P95 blend would run for like two minutes, then fail - "Rounding was 0.5, expected less than 0.4".
So then I lowered the RAM voltage to 1.8V and immediately got a BSOD. Rebooted, returned settings to how they were before the BSOD. Stress tested again, failure after about 2 minutes, as expected.

Then I let the system cool down, lowered the RAM voltage to 1.9V and stress tested - failure after 10 seconds!

Now the big Q is: how much voltage can I give this *****ty (sorry) ValueRAM. It says Kingston PC2-6400 (400 MHz) 2G-UDIMM in the SPD. Serial number for the first of the two 2G dimms I have installed right now is 88138456, Week 25/08. Not sure if that is even helpful. By the way, it has no heatsinks/spreaders whatsoever.
How far would you go with the voltage for that RAM?
Home PC
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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CoolerMaster M520 Big Tower, 120mm fan (back), 3x 90mm fans (front) MS IntelliMouse Optical 
  hide details  
Reply
Home PC
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CPUMotherboardGraphicsRAM
Core 2 Duo E6300 B2 (Allendale) Gigabyte EP43-DS3L Radeon 6950 4x 2 GB Kingston ValueRAM DDR2-800 
Hard DriveOptical DriveOSMonitor
lots dusty Vista 64bit AMW 17", kicks ass! 
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post #10 of 10
why dont you jun with a 1:1 ration for the mem and fsb? thats why i do on my e6600. I remember reading back like 3 or so years ago that the best way was to keep the mem at 1:! for stability or somethings. It hasent flawed on me yet. I usually get to 350 fsb before i need to up vcore.
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