e8400 overclock to 3.6Ghz - problems

Wanna know what drives me nuts? I dont know if you are runnin' the tests after ya boot or what, but stupid pre fetch can do that to me sometimes. Though it doesnt effect whatever its doing, it looks like it does. As in, my mouse jumps around and freezes like that, though its not "really" doint it! And if I release a huge amount of RAM, like from prime 95s blend test and swap to a test that uses way less ram, pre fetch is at it again!

Oh, anyone know how to kill pre fetch? Damn thing trashes my Crysis!

--Lupi! (Ignore meeeee!)

Lupi,
not sure about the pre-fetch thing, but it seems to be consistent when I go over 385-390 MHz on the FSB. Can you explain what you mean by pre-fetch for me?
BIOS is up to date.
Maybe it's temp related. My mobo utility tells me I'm 25C idle and 40C load, running on air. Maybe these temps are wrong.
Jay

Core temp is correct with the OC you're doing at that Voltage. I'm running 3.6 on my Wolfdale with 1.296v(per CPU-Z) and I'm running a 25C idle(Tcase, this is what your Mobo utility reports) and 35C idle under CoreTemp (which reports Tjunc1/Tjunc2) Under load in Prime95 it will peak at 70/71(Tjunc), but settle down after several hours and go into the 60s...and thats with me on an Intel HSF!!! Tcase for me peaks @ 60C, which is fine considering that throttling doesnt take place until 72.5C Tcase. 100% stable after just short of 12hours (overnight run) and i got 16,414pts on 3dMark06. im running the X38-DQ6 board, so i have better power regulation, so there may be a voltage drop on your PCIe bus that's causing the stutter. I wouldnt take too much stock in 3dMark "looks" because i average 230fps in HL2:Lost Coast and looks soo smooth that i can tell whoever made the flythrough didnt make a very smooth movement pattern at all

Relax the timings on the memory.

Hmmm, you're right, at at first I thought it may be because the volts weren't high enough to support that speed and timing consistently, but if you were running them before at 4-4-4-12 and 800 then its most likely not the problem.

Devriak,
thanks for the info. What is the full name of TRFC? It may be called something else on my mobo. I believe I have all the timing options available to me, I just don't recognize that name.

Kridian,
I'd first try the 1:1 memory ratio (on this board it is described as 2.00B (you can also try 2.00D although the 2.00B seems more stable for me)
Then up the FSB bit by bit. I had to hit the 1.2875 Vcore setting to remain stable at 3.6Ghz. (400Mhz FSB)
Remember to run Prime as you go to ensure everything is stable.
then benchmark when stable at 3.6Ghz
THEN.
if you have DDR1200, try one of the 3.00 memory multipliers to hit your 1200DDR. However, you may get away with tighter memory timings with the 2x multiplier, so all you can do is bechmark and see which gives you better performance.
One thing I have discovered is the 1T command rate at 800DDR 4-4-4-12 doesn't seem to yield much performance increase in a benchmark, but games seem to be a little more responsive....

The only things you need to worry about

1. Turn CPU Host Clock Control to ENABLE

2. Up your CPU Host frequency. A nice starting point might be to go from 333Mhz to 350Mhz REMEMBER YOU NEED TO MONITOR YOUR CPU TEMP to avoid damaging anything. If you get problems, check temps, check vcore (more vcore required for higher speed HOWEVER more heat needs to be dissipated)

3. Turn Performance Enhance to STANDARD

4. Set your PCI Express to 100 Mhz (you don't want this to rise as you up your FSB)

5. Set your System Memory Multiplier as I described EARLIER (ie 2.00B) You can tinker with this To Your Hearts Content once you get the basic setup stable.

6. As your ram will be essentially underclocked initially, take the tightest timings the manufacturer recommends.

SEE HOW YOU GET ON

also

http://www.tomshardware.com/2008/0 [...] _steroids/

http://www.legionhardware.com/document.php?id=717

http://www.diy-street.com/forum/sh [...] p?p=779228

My E8400's **** for the temps too..

CPU is at 21'c Idle...

Core 1 @ 42'c IDLE
Core 2 @ 42'c IDLE.

Whats that all about?

Increasing the Vcore is not mandatory.

I decided to increase the voltage when my overclock was not stable past 385MHz fsb.

As the frequency of the CPU increases, it sometimes needs a little more JUICE!

If you have hit 3.6Ghz with no increase in vCore then you have a good processor.
Stress-testing will reveal any weaknesses in your overclock. Have you run prime95 yet?