How can I overclock my Intel E8400 higher?

[Ensimilia]

Hey guys
I'm in need of a little assistance / advice on overclocking my Intel Core 2 Duo E8400.
I’m trying to overclock my E8400 from it’s stock speed of 3.00Ghz to as high as I can.
4.90Ghz (unstable) and 4.5Ghz fully stable are my main goals.

In order to do this I have of course replaced my Intel stock cooler with a good aftermarket cooler. I chose for the Scythe Mugen Max with an additional second fan. I also invested in faster 4GB DDR3-1333 CL9 Ram instead of my 4GB DDR2-800 CL5 sticks.

I already succeeded in reaching 4.80Ghz with a multiplier of x9 and FSB of 534Mhz at 1.72V.
CPU-Z Validation link: http://valid.x86.fr/pr1q41
Tomorrow I will try stabilizing the CPU at 4.5Ghz so it can pass a 24hour Prime95 stress test.

The problem is when I try to go higher than 4.80Ghz the “CPU host clock control” keeps resetting itself to disabled. Is there any way to prevent this from happening?
I already have advanced BIOS features like “CPU Enhanced halt”, “CPU themal monitor 2” and “CPU EIST function” set to disabled.

Also would this RAM be better/equal/worse for overclocking my E8400?
==> Apacer 4GB (2x2GB) DDR2-800 CL5 1.8V

My full system specs:
CPU: Intel Core 2 Duo E8400 (3.00Ghz stock)
CPU Cooler: Scythe Mugen Max + optional second fan
GPU: Gigabyte GTX 560
RAM: Corsair XMS3 4GB (2x2GB) DDR3-1333 CL9
Mobo: Gigabyte P35C-DS3R
HDD: Seagate Barracuda 7200.10 250GB 7200RPM
PSU: Cooler Master iGreen Power 600W
OS: Windows 10 Home 32-bit

Thanks to anyone who can help me out with this. :)

[_I_]

your probably at the limit of what the ram can do
lower the ram multi to its lowest options

if you lower the cpu multi and cannot bring the fsb any higher its the ram holding you back

[Ensimilia]

I don't think it's the RAM holding me back though.
Because when the RAM is at it's lowest mutiplier which is 2.00 it's still well below 1333Mhz. At 4.80Ghz with an FSB of 9 * 533 it's only running at 1066Mhz.

If the motherboard wasn't holding me back and If I had water cooling in theory I think I could hit 5Ghz with this RAM because: FSB of 555 * 2.00 memory mutli = 1110Mhz which is still below it's rated speed of 1333Mhz. Or do I see this wrong? :o

[rotNdude]

Overclocking is dependent on many things and I think you've reached the limits of the motherboard.

[_I_]

you can try dropping the cpu multi and ram multi to see if its the boards fsb thats the limit

[Ensimilia]

Originally posted by _I_:

you can try dropping the cpu multi and ram multi to see if its the boards fsb thats the limit

Ok i'll try that.

[Ensimilia]

When i drop the cpu multi & ram multi to it's lowest values it still keeps resetting the cpu host clock control to disabled. However at 4.85Ghz it does successfully POST without resetting but then fails to load into Windows.

So with my DDR2-800 memory sticks I can get my system to boot at 4.85Ghz at POST screen but it won't load into Windows. I think my RAM timings are set too aggressive.

Can you give me some advice on which RAM timings I should fill in?

There are so many combinations I just don't know which ones to fill in lol.

Here's 2 pictures of my M.I.T. frequencies & voltages @ 4.85Ghz:

MIT Frequencies & RAM timings: http://i.imgur.com/RPydcwZ.jpg

MIT Voltages: http://i.imgur.com/n1nYCDv.jpg

This is with the DDR2-800 CL5 sticks NOT the DDR3-1333 CL9 sticks.

[Ensimilia]

Using the program "SetFSB" I booted into windows and then increased the FSB manually in windows from 4.68Ghz to 4.91Ghz!! http://valid.x86.fr/s3w29l
This was when I booted with a Vcore of 1.8V with the DDR2 sticks. I hope I can manage do this again and get it to validate at 5Ghz. :D
Normally my system refuses to boot with a Vcore of 1.8V... so I think I got lucky

New problem: When I try to validate my E8400 with CPU-Z at 4.94Ghz or a little higher CPU-Z crashes right after when I click the "save manual validation file" button :( When I try the normal "submit" button the same thing happens. Help please.