E8400 Overclocking

[coolamasta]

Whats a good overclock on an E8400 CPU on an Asus P5B motherboard?

I don't want to go silly as its on air cooling but as its 3ghz stock would 3.6ghz be a reasonable jump?

Any advice greatly appreciated as im still a noob when it comes to overclocking lol

 

[jandlecack]

Don't stop before you tickle the 6GHZ.

 

[crazylegs]

Hopefully you'll do 3.6ghz in ur sleep, mine went to 4.0ghz at stock on air and i ahd no need to push it further - would have needed more juice and resulted in a hotter running system.

 

[BTRY B 529th FA BN]

My E8400 C0 needs somewhere around 1.30vcore to stabilize at 3.6 which jumps up the idle temps by as much as 5-6*c at stock settings it idles around 39*c in 77*f - whats funny is it can run on .960vcore

Use CPUz and see what revision e8400 you have. If its an E0, you are in for some fun!

 

[coolamasta]

Its a C0 How overclockable is this one?

http://ngb.rob2k.co.uk/pics/pcs/E8400.jpg

Why cant I put that in as a pic with the

 

[BTRY B 529th FA BN]

I have ran mine at 500fsb x 8 multi and used 1.4vcore but i'm lovin the temps with everything stock; currently idling at 37*c in 77*f ambients with a TRUE

 

[Gillbot]

Originally posted by: coolamasta
Why cant I put that in as a pic with the code?![/quote]

Images are disabled here due to abuse.

 

[coolamasta]

Ah right fair enough

So do you peeps think that reliable 3.6ghz on this C0 version is possible on a decent air cooler?

 

[BTRY B 529th FA BN]

Yeah, even 4Ghz is possible. You know how to check stability right? You might need a little PLL VTT and NB volt increases but even with a C0 its possible

 

[coolamasta]

Yeah got prime 95 and memtest etc to test stability, its going to be folding 24/7 so I need it to be reliable so I will try for 3.6 first and then try for 4ghz

Cheers bud,

FSB wise I assume I need to run 400 for 3.6 and 450 for 4ghz?

V-core wise you think 1.3v would be ok for 3.6ghz? Any idea what voltage I would need to run for 4ghz?

Also the board I have Asus P5B plat any idea if these are ok for the overclocking?

Thanks again for the help

 

[BTRY B 529th FA BN]

It's all luck of the draw. You'll find out about the volts needed and those FSB numbers look right to me.

Good Luck!

 

[coolamasta]

OK got it to run @ 3.6ghz quite happily with 400fsb, 1.3 vcore but at 445fsb and 1.35vcore plus some other tweeks it posts but bluescreens on windows boot

 

[BTRY B 529th FA BN]

try raising the NB volts and VTT

 

[Bman123]

I took my buddies C0 E8400 to 4.2ghz on air with a P35 mobo

 

[GrJohnso]

I've had my C0 8400 running at 3.89ghz for daily use at 1.325v for a year now on a GA P35 board with basic aftermarket air cooling.. Benched okay just over 4ghz, but I choose keep it a little lower for friendlier voltage and temps for everyday use...

Hoping to get my hands on a qx9750 soon for a little quad love soon.. Hope it can at least get similar results on current hardware...

 

[crimson117]

Originally posted by: coolamasta
its going to be folding 24/7

Only folding? Or folding in background while you work?

Only folding, you'd get much better results by folding on an nvidia GPU instead of an OC'd E8400: http://folding.stanford.edu/English/FAQ-NVIDIA

 

[coolamasta]

Originally posted by: crimson117

Originally posted by: coolamasta
its going to be folding 24/7

Only folding? Or folding in background while you work?

Only folding, you'd get much better results by folding on an nvidia GPU instead of an OC'd E8400: http://folding.stanford.edu/English/FAQ-NVIDIA

I'm a bit of a folding Guru mate, I already have 8 Nvidia GPU's folding, a couple of quad cores and this e8400 will be in a dedicated folding machine along with 2 more 9800GT GPUs

Just wanna get as much out of the CPU as possible without making it unreliable

 

[crimson117]

Originally posted by: coolamasta

Originally posted by: crimson117

Originally posted by: coolamasta
its going to be folding 24/7

Only folding? Or folding in background while you work?

Only folding, you'd get much better results by folding on an nvidia GPU instead of an OC'd E8400: http://folding.stanford.edu/English/FAQ-NVIDIA

I'm a bit of a folding Guru mate, I already have 8 Nvidia GPU's folding, a couple of quad cores and this e8400 will be in a dedicated folding machine along with 2 more 9800GT GPUs

Just wanna get as much out of the CPU as possible without making it unreliable

Okay then! Just making sure

I hit 3.6 on my E8400 easy by bumping up the ram to 400Mhz. I've never bothered going higher - I like easy OC's without a lot of math or voltage tweaking involved.

 

[lopri]

3.6GHz should be easy as 1, 2, 3. E8400 is an epitome of Intel's 45nm manufacturing and Core 2 architecture in general, IMO. Enjoy it! I love mine and it's C0 as well.

 

[Udgnim]

4 GHz is standard for E0 E8400s

 

[coolamasta]

It is a C0 but I got 3.6 no problem but on 4ghz @ 1.35 vcore it will post but wont boot, I will have to have another play and try upping NB & VTT etc otherwise I will just leave it at 3.6

 

[BonzaiDuck]

Originally posted by: coolamasta
It is a C0 but I got 3.6 no problem but on 4ghz @ 1.35 vcore it will post but wont boot, I will have to have another play and try upping NB & VTT etc otherwise I will just leave it at 3.6

First, I notice you have an old 680i Striker board in your sig with a Q6600, but you're taking the E8400 with a P5B board for this latest OC. I assume the P5B has a P965 chipset, and my naive assumption would be that this, too, is a dated chipset.

I needed a test machine for a Windows 7 RC1 install, and with a spare Striker 680i, some G.SKILL DDR2-1000 4GB RAM and a C0 E8400 Wolfdale, thought I would OC this sucker. Ordinarily, some would sell these older boards for which initial enthusiasm gave way to frustration, but the fam-damn-ily likes "Christmas upgrades," and for that -- the Striker can be "decent." In the meantime, I'm tinkering . . . .

This board had been RMA'd for what I thought were more serious problems, but all I found when ASUS returned it was a replaced PLCC BIOS chip with the latest BIOS version extant in fall, 2008.

What I find is promising: I've already got it to host-freq 370, DDR 740 and FSB 1480 with a VCORE SETTING of 1.3125V. 1.3125 "set" gives 1.29V reported in BIOS -- which is what the "Auto" setting provided. CPU-Z reports 1.216V VCORE idle and 1.200V under PRIME95 Small-FFT load. The RealTemp temperatures are hanging in below 47C load @ 72F room-ambient.

This should be fun. Y'all hate the 680i chipset now, and if I were to pick nVidia and seriously lay out more bucks for a board, it would be a 780i or 790i. Really -- though -- I'm NOT going to pick nVidia, and I'm NOT going to lay out serious socket-1366 buckets-of-ducats until around New Year's. Maybe by then, nVidia will have something for socket-1366 -- probably not -- so it's going to be Intel -- maybe X58.

But nobody waited for these new Striker 680i BIOS updates, so -- yeah -- I'm gonna have fun today . . . .

 

[coolamasta]

Originally posted by: Udgnim
4 GHz is standard for E0 E8400s

But mines a C0!

Its 100% rock stable at 3.6 at the moment but doesnt seem to like 4ghz.

Can someone paste their settings for 4ghz on a C0 so I can compare please

 

[coolamasta]

Originally posted by: BonzaiDuck

First, I notice you have an old 680i Striker board in your sig with a Q6600, but you're taking the E8400 with a P5B board for this latest OC. I assume the P5B has a P965 chipset, and my naive assumption would be that this, too, is a dated chipset.

I needed a test machine for a Windows 7 RC1 install, and with a spare Striker 680i, some G.SKILL DDR2-1000 4GB RAM and a C0 E8400 Wolfdale, thought I would OC this sucker. Ordinarily, some would sell these older boards for which initial enthusiasm gave way to frustration, but the fam-damn-ily likes "Christmas upgrades," and for that -- the Striker can be "decent." In the meantime, I'm tinkering . . . .

This board had been RMA'd for what I thought were more serious problems, but all I found when ASUS returned it was a replaced PLCC BIOS chip with the latest BIOS version extant in fall, 2008.

What I find is promising: I've already got it to host-freq 370, DDR 740 and FSB 1480 with a VCORE SETTING of 1.3125V. 1.3125 "set" gives 1.29V reported in BIOS -- which is what the "Auto" setting provided. CPU-Z reports 1.216V VCORE idle and 1.200V under PRIME95 Small-FFT load. The RealTemp temperatures are hanging in below 47C load @ 72F room-ambient.

This should be fun. Y'all hate the 680i chipset now, and if I were to pick nVidia and seriously lay out more bucks for a board, it would be a 780i or 790i. Really -- though -- I'm NOT going to pick nVidia, and I'm NOT going to lay out serious socket-1366 buckets-of-ducats until around New Year's. Maybe by then, nVidia will have something for socket-1366 -- probably not -- so it's going to be Intel -- maybe X58.

But nobody waited for these new Striker 680i BIOS updates, so -- yeah -- I'm gonna have fun today . . . .

Hi mate, yeah the striker and Q6600 is my main PC still until I go i7 soon, this E8400 is going to be a dedicated folding machine, I got given the P5K board and had an E8400 lying about so wanted to push them as hard but reliably as possible.

@ 3.6ghz it seems rock solid after many hours of Prime 95 and IntelBurnTest just wish it was the E0 version, as well lol

 

[BonzaiDuck]

Yo! Now I remember! We had vast conversations about that board some time ago. IdontCare was also throwing in his two-cents worth.

Yeah -- 3.6 is easy for this old C0.

I can't even remember the BIOS revision that came back with the RMA repaired board. 1605? Only thing to do is look at the ASUS web-site, because the BIOS revision would've been for around September, 08.

I was really careful this time to leave the other voltages alone, other than to fix them at values that gave the same results as reported in BIOS monitor for the "Auto" defaults:

VCORE "set" to 1.3125V, shows 1.29V in BIOS and 1.216 in CPU-Z
1.2_HT setting was 1.25 shows 1.29 in BIOS monitor
NB set to 1.30 -- reported as 1.32
SB set to 1.5 -- reported as 1.52
VTT set to 1.35 reported at 1.29

I bumped the VTT up one notch to increase it by 0.04V over what the stock "auto" gave.

So 3.6 Ghz/DDR=800 is giving temperatures around 50C for room-ambients between 72F and 76F at load. NB temperature has edged up from about 48/49C to a peak of 51C under load. More than 8 hours PRIME95 Small-FFT stable, so far.

And I'm only cooling it with a TR Ultima 90 -- second-fiddle to the TRUE in summer, 2007.

It just looks to me that this can go farther. But it's an old motherboard; dated chipset. I KNOW that some were pushing it to 500 Mhz host-frequency with lower multipliers. I just don't know . . . . and there's only one way to find out . . .