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e8400 overclock help!

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April 23, 2008 8:00:49 PM

this is my first complete build and overclock. i am running:
Core 2 Duo e8400 @ 3.825ghz(425x9) vcore 1.232 41/59C Load
Crucial Ballistix 4gb(2x2gb) DDR2 800 @ 850mhz 4-4-4-12 2.18v
eVGA 8800GTS(g92) 512mb slightly over stock
OCZ SilentXStream 600w PSU
Arctic Cooling Freezer 9 or 7 92mm
Gigabyte P35-DS3L Mobo

I am having some problems with adjusting the vcore on the CPU... i will go in and slightly change it in the bios, but the vcore seems to go between 1.216 / 1.232 / 1.248. Is that normal? in the bios i am setting it to around 1.29 and it shows 1.232 CPU-z load. those temps were taken with realtemp, is that OK to run at or do you think its too hot? i am also kind of lost with the memory timings. i will probably be pushing the ram a bit more and i dont really know what to do other than 4-4-4-12 and 5-5-5-15. is there some guide on how to fine tune these? in addition, i may try and get the overclock to break 4ghz. any help would be much appreciated.

More about : e8400 overclock

April 23, 2008 10:06:19 PM

It's normal that your CPU-Z reading is different to the BIOS one (usually lower in CPU-Z, go by this value) and that the vcore drops under load. My cpu runs another 5 degrees hotter than yours at 1.4 V, your temperatures are fine.

As you probably know, the looser the timings, the higher you can clock the MHz. I'm not so sure about what each one does but generally speaking, a higher MHz will help you a lot more anyways. The Ballistix should be able to go higher than that without too much of an issue, even though the new single sides RAMs are worse than the old double sides ones.
April 23, 2008 10:26:09 PM

gLip said:
As you probably know, the looser the timings, the higher you can clock the MHz. I'm not so sure about what each one does but generally speaking, a higher MHz will help you a lot more anyways. The Ballistix should be able to go higher than that without too much of an issue, even though the new single sides RAMs are worse than the old double sides ones.

Not necessarily true. Higher frequency does mean better performance, but many people has found that setting the fsb to ram ratio to 1:1 offers the best performance. Although you wouldn't really notice the small difference, as long as you have the timings set accordingly, there is no point in having ram faster than necessary (1:1).
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April 24, 2008 12:21:26 AM

If your just after a 4Ghz overclock loosen your RAM timings and leave in Sync or 1:1, try the vcore at around or below 1.36v no more than this should be needed. FSB to 445 and you'll prob boot up just fine dunno bout temps mind :) .
April 24, 2008 4:46:42 PM

Fair enough, I've never had DDR-800 RAM, have 1066, so I never run it 1:1.

My CPU needs 1.4 to get 3.85 stable, but I expect the newer batches to do a lot better.
April 24, 2008 6:55:34 PM

1.29 is a little bit low don't you think if you are aiming for 4ghz?
with vcore around 1.2ish thats at full load 59c thats a little hot where do you live and how hot is your room?
April 24, 2008 8:55:26 PM

No... your core will always be very much higher than your actual CPU... dont worry about +60C. It doesnt make a diff.
Memory timings: Once you get to where you want to be and are CPU stable... that's when you want to mess with timings and get them as low as possible. A good way to test is blend prime95 or orthos.
For 4Ghz it depends on your board. I can set 1800mhz FSB link and sync (1:1) for a nice 900mhz overclock on the memory and run 5-5-5-15 timings. Just bump up vcore, fsb, nb, sb and memory voltages to apporpriate settings. Again depends on the board. Usually the cpu will need between 1.325 and 1.425V for 4.05ghz. Some have had better luck with 500mhz with 8x multi. I like the less stressful 450mhz though.

You are on the right track... just keep tweaking and testing! Dont worry about the temps with a 4.0ghz overclock. As long as you arent running much above 1.4v and have a good HSF mount you should be good under 60C. I have heard and read so much contraversial issues with the temps on these little 45nm chips. There are a lot of bugs in the sensors and the core varies tremendously.
April 24, 2008 9:07:37 PM

I am not sure what to do to my fsb, nb, and sb voltages. Should I just bump them up +.1v or something? So far I have had them at stock.
April 24, 2008 9:09:15 PM

You probably should, since you're running at 425Mhz FSB speeds.
April 24, 2008 9:15:33 PM

Here's mine:



4 GHz is easy. change multiplier to 9, bus to 450 and you're at 4 GHz.

I've got 2x2 GB of Corsair XMS2 800 OC'd as well. 5-5-5-15 (from 5-5-5-18 stock) and 1.9v (from 1.8v) and they're at 900MHz, so I've got 1:1.

Here's my cooler.... http://www.newegg.com/Product/Product.aspx?Item=N82E168...

52 degrees is the hottest it got.

April 25, 2008 12:09:35 AM

trace_87 said:
I am not sure what to do to my fsb, nb, and sb voltages. Should I just bump them up +.1v or something? So far I have had them at stock.


Only mess with voltages if you run into instability issues
April 30, 2008 7:05:55 AM

i may just settle on this overclock for the time being. have it running stable 24 hours of p95 small ffts 3.825ghz 425x9 42/57C Load 1.248vcore with 4-4-4-12 timings. are these toward the upper range of where the temps need to be for it to keep on trucking for a while? or can i push it further safely. have any of you used these 2.2gb ballistix ram before? any tips?
April 30, 2008 7:50:15 AM

Your temps are fine, assuming that "42/57 C" means 42 idle - 57 load. You're good for another 10 degrees. You also have a really low voltage, so you can raise that without issues.

Don't worry about pushing it further, when your RAM can't take it, your Prime95 will crash, no big deal. You can also check your RAM stability with Memtest if you want to.
May 1, 2008 6:32:08 AM

pumped up my GPU a bit and got a 3Dmark06 of 14300, thats pretty good right?
May 1, 2008 7:42:16 AM

^^ that is very good IMO.
May 1, 2008 8:46:07 AM

Yeah, it's pretty good. When I put my CPU to 4 GHz and my 8800 GTS 512 to 804 - 2010 - 1052, I was able to get just over 15,000 3Dmarks.
!