Overclocking headache

KaBar

KaBar

KaBar

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Joined
12 Aug 2006
Posts
59
Ok my set-up is as follows:

Processor: E6300 (B2 revision) with Artic Cooling Freezer 7 Pro
Motherboard: Gigabyte GA-965P-DS4 (rev1.0 with F11 Bios)
Memory: Corsair PC2-6400 4x2GB (Just upgraded from 2x1GB Geil)
Other Stuff: HD4670 512Mb, 580W PSU. Running Vista 64

I have been relatively sucessful in my overclocking so far but seem to have hit a ceiling.
I started out by disabling CIE & EIST and locking the PCI Express frequency to 100mhz. I switched the voltages to manual but left everything at their 'normal' voltage (CPU 1.275 and RAM 1.8). I started creeping up the FSB adjusting the memory divider as I went to ensure the memory was running as close to its stock speed as possible (therefore testing the CPU ceiling, not the memory?).
Unfortunately I can't get the computer to post past a FSB of 385Mhz despite seeing other people with the same chip, cooling and mobo hitting up to 485Mhz. I have tried pushing the CPU voltage up to as far as 1.4125 but it makes no difference at all. I don't know what to try next?

The only answer I keep getting if that it must be my memory thats limiting me. Now correct me if I am wrong but I'm pretty certain I'm not even close to hitting my memory's max. My FSB is 385Mhz, with a 1:1 divider I'm running under the 400Mhz you get for PC2-6400 Memory. When running at a FSB of 300Mhz with a 2:3 divider my memory runs fine at a speed of 450Mhz. So I can't see how being unable to step from a 385 to a 390 FSB can have anything to do with my memory.

Am I completely missing the point with the memory side of things or am I right in thinking its not the memory that is limiting me? and does anyone know what I can try next?
 
There are plenty of variables when overclocking...

Worst case is your chip is pants at overclocking...

First off you'll also need to increase Northbride, Southbridge and RAM voltages to increase the overclock... DDR2 runs fine at 2.2v, I always throw ram to this before even thinking about overclocking.
 
try putting the northbridge voltage up a tiny bit and your RAM should really be at 2.0V if its decent ram
 
The RAM is http://www.overclockers.co.uk/showp...Corsair 4GB DDR2 XMS2 PC2-6400C5 TwinX (2x2GB) it's said to run at 1.8-1.9v so seeing as it seems to be able to handle speeds higher than I can get my CPU to at 1.8v I didn't see the point in incrasing the RAM volts.

How high can I safely go up on the FSB overvoltage, the board will let be go from +0.5 to +0.35v but what is a safe ceiling?

and what is (G)MCH overvoltage?
 
I have

Processor: E6300 (B2 revision) with Artic Cooling Freezer 7 Pro
Motherboard: Gigabyte GA-965P-DS4 (rev1.0 with F8 Bios)
Memory: Corsair PC2-6400 2x2GB

the last time i reclocked my system(putting the new memory in sick of rma'ing balistix, and moviing to a new case) I left the voltages on Auto and just upped the fsb to 450 and the memory divider to 2, so memory is at 900 5 7 7 20 (1.8v) and cpu is at 450 x 7 cpu-z says the voltage for this is 1.39.

if i remember correctly when i was first clocking it and going up in 5fsb jumps there was a range i couldn't get on the cpu, but someone on here said they had got higher so i jumped a largish chunk, its been about 2 years I can not remember the exact figures now. But when I reset bios now adays i just stick it straight back to 450.

I must admit i hadn't realised the cpu v was so high but i haven't really paid attention since i put my new memory in 4 weeks ago.

my system is on 24/7 and cpu core temps are about 50 according to cpuid hardware monitor core temp
 
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Sometimes its the simplest solutions :) thanks Ade74

Really wierd how my computer runs fine with a FSB of 385Mhz, but refuses to work no matter what I tried at 390, 395 or 400. Never even considered just jumping all the way up to 450, and it worked.
Now I just need to check it's stable and mebe push it a little further.
 
That's known in the trade as an FSB-Hole! :D

I'm not that familiar with your mobo but if that's an Intel® P965 Express Chipset it changes FSB Strap at around 400MHz which may account for your leapfrogging success! :)

Newer boards control the FSB-Strap better and even allow you to control it directly regardless of what FSB you have set!
 
Yeah that is the chipset it uses, fell into the FSB hole.

System is currently stable running at 3.15Ghz (450Mhz FSB) at only 1.275v and memory timings tightened to 5 5 5 18, with idle temps of 42 and load temps of 58 (with one of my two case fans unplugged as its a bit noisy and needs replacing).

Had a quick try pushing it higher but 480 & 485 will post but blue screen when loading windows and 475 loads windows but fails prime95 pretty quick. Might do some more in depth testing later. But for now I'm quite happy to have a 1.86Ghz chip running at 3.15Ghz, Crysis is actually running on full detail now ;) although that may have something to do with upgrading from 2GB to 8GB of RAM.
 
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