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*LAME* E6850 overclock, assistance requested

post #1 of 28
Thread Starter 
Hi,

I spent the last day or two overclocking my shiny new E6850 with disappointing results. I bought a great case, RAM, mobo, cooler, and now I'm wondering if perhaps I got a dud CPU. This is my first time overclocking an Intel system, so there's a good chance I missed something important.

See my sig for detailed system specs. This is a brand new rig with all new components.

In the BIOS, I've disabled every peripheral I will not be using, including a network controller, onboard sound, floppy controller, RAID controller, etc. Additionally, Ive disabled support for EIST and C1E. I did keep Virtualization enabled as I plan on running virtual machines on this system.

At stock voltage/speeds, my CPU sits at 28C on idle, and 38C on full load (2 instances of Prime95 torture test). The system is stable and I've tested it by running Prime95 overnight successfully. On to the overclock.

The good news is that my Crucial PC6400 DDR2 seems to overclock very well. At the stock voltage of 2.2v, I can easily reach PC-8888 speeds (370 FSB @ 1:1.50 fsb/ram ratio). While attempting to overclock the CPU, I set the RAM back down to 1:1 ratio so that only the CPU & mobo would be stressed by FSB adjustments.

In order to get any potential motherboard voltage issues out of the way, I maxed out my VTT/MCH (NB)/ICH (SB)/ICHIO voltages prior to overclocking my CPU. Obviously the plan is not to run at these voltages for long, but it was done to prevent any "interference" while attempting to max out my CPU.

At 400 Mhz x 9 and 1.33v CPU (stock): system crashes immediately on Prime95 torture test.

At 400 Mhz x 9 and 1.38v CPU: system crashes after 5 minutes of Prime95 torture test.

At 400 Mhz x 9 and 1.42v CPU: system seems stable, CPU temp is 49C under full load

At 410 Mhz x 9 and 1.42v CPU: system generates invalid result after 1 minute in Prime95 torture test.

At 410 Mhz x 9 and 1.50v CPU: system seems stable, CPU temp is 54C under load.

At 420 Mhz x 9 and 1.55v CPU: system crashes after 5 minutes of Prime95 torture test.

At 420 Mhz x 9 and 1.60v CPU: system seems table, CPU temp is 68C under load.


These results are very disappointing to me. From previous reports I'd been hearing, and considering I've only bought first-rate components, I was expecting to easily reach 4Ghz.

Can you think of something I missed? Did I just get a crappy chip? Thanks in advance for any assistance you can give.
post #2 of 28
Check the flatness of the base of your heatsink. I've got the same one and lapping it made a WORLD of difference in my temperatures.
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R'lyeh
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post #3 of 28
Did you take the Ram to the lowest FSB you could while testing the CPU?

And did you run a MemTest after you OC'd the Ram to 8888 speeds?
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post #4 of 28
Your killing that CPU with those voltages. You crash as much for OVERvolting as you do UNDERvolting.

And USUALLY my crashes are from my RAM. Leave your RAM at stock, OC your CPU until stable, then OC your RAM. One factor at a time so you KNOW which is crashing you.
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post #5 of 28
What ram frequencies were you running through during your overclock testing?

By the way, PC-8888 would be somewhere near 555 FSB, so I think you meant PC2-800 (400 FSB)?
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post #6 of 28
Thread Starter 
Quote:
Originally Posted by ae804 View Post
Did you take the Ram to the lowest FSB you could while testing the CPU?

And did you run a MemTest after you OC'd the Ram to 8888 speeds?
I was actually just editing my post to add this information. I took the RAM back down to 1:1 ratio (lowest available) while testing the CPU.

I did not run MemTest at 8888 speeds, however I did run Prime95 torture for a few hours successfully.
post #7 of 28
Thread Starter 
Quote:
Originally Posted by afzsom View Post
Check the flatness of the base of your heatsink. I've got the same one and lapping it made a WORLD of difference in my temperatures.
How would I go about checking the "flatness"? I took a quick look at it prior to install, and the heatsink base was very smooth. Is that what you mean?
post #8 of 28
Quote:
Originally Posted by Mikkle View Post
I was actually just editing my post to add this information. I took the RAM back down to 1:1 ratio (lowest available) while testing the CPU.

I did not run MemTest at 8888 speeds, however I did run Prime95 torture for a few hours successfully.
?????

1:1 means if you are clocking FSB 1680 (420MHZ) you are pushing your RAM to the same 1680mhz.
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post #9 of 28
Check to see if you need to lap by:

1) Razor blade / flashlight trick: Set your heatsink down so the base is pointing towards the ceiling. Aim a flashlight across the base so the light shines at you. Place a NEW razor blade across the base and see if you notice any light passing between the base and razor blade edge. If you do, you might want to consider lapping. Check horizontally, vertically, and diagonally to be sure.

2) Water droplet / glass test: Same orientation of the heatsink as before, and place one or two drops in the center of the heatsink. Take a flat piece of glass and lay it over the top. If it doesn't spread evenly, there's a concavity/convexity of the base, and lapping should be done.
R'lyeh
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R'lyeh
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post #10 of 28
Thread Starter 
Quote:
Originally Posted by nitteo View Post
?????

1:1 means if you are clocking FSB 1680 (420MHZ) you are pushing your RAM to the same 1680mhz.
I think I may be missing something here.

I first took the RAM up to 555 Mhz (370 FSB at 1:1.50) to see how high it could go, and ensure it would not be a limiting factor.

When I was testing the CPU overclock however, I set the RAM back down to the lowest ratio available (1:1), to ensure it would not have a negative impact on the CPU overclock. When I checked the CPU-Z memory tab, it would say the RAM ran at the same speed at the FSB, e.g. 400-420 Mhz... well below the 555 Mhz I was able to reach when testing the RAM itself.
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