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E8500 Help :>

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M

Mezzanine123

New Member
Joined
Apr 11, 2008
Hi there! I am after some advice on my Intel e8500 :)

I am trying to get my CPU stable at 4.00Ghz, but it is causing me grief :bang head !

Currently my BIOS settings are as follows:
1.425 Vcore
4000 Core speed (4.00 GHz) (1687 FSB Linked)
9.5x Multiplier

With these settings I get an error from Orthos. Instinct tells me to raise the Vcore but I believe it is already very high for a 45nm chip, or am I horribly wrong?

PC specs:
ASUS P5n-e SLI motherboard
2GB Corsair XMS2 Ram
Intel Core 2 Duo E8500 3.16GHz cpu

(Ps. I have tried achieving 4.0GHz on an 8.5x multiplier, but i run into a FSB wall)

Help and suggestions much appreciated <3
Thanks!!
 
Try reading the voltage at the CPU by using one of the software tools - you might find the voltage lower than what is set in BIOS. Did you know that the recommended max is 1.3625? It's your call if you go over or not.

I know I can't get to 4GHz with my E8400 without going over the rec max.
 
Hi there! Thanks for the replies!

I am cooling my CPU with a Zalman 9700NT.
I have 2.17 V to my RAM, (no cooling).
I have an Antec 900 case. 5 Case Fans, 4 120mm and 1 200mm
(Two front, back & top exhausts, and one side pannel fan).

With these settings
5-5-5-15 Ram timings
2.17V to Ram
1.368 Vcore
1687 FSB (421 Bus speed)
DRAM freq 506 MHz
SPD Tab in CPUZ reads (RAM slot #1): 270MHz - 400MHz with a 1.8V Voltage

I am getting 25 Degrees IDLE motherboard
and 26 Degrees IDLE cpu

http://i295.photobucket.com/albums/mm137/Mezzanin3/SS1.jpg
http://i295.photobucket.com/albums/mm137/Mezzanin3/SS2.jpg
http://i295.photobucket.com/albums/mm137/Mezzanin3/SS3.jpg

(FYI the dram frequency is actually set to 425MHz not 506MHz!)
 
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Update:

Turns out i can overclock fine with an 8.5x multiplier, without hitting any fsb walls.

With either 1880 FSB on a 8.5x mult, or 1687 FSB on a 9.5x mult I get the same problem.

Orthos will run without fault during a 'Blend - stress CPU and RAM'
But be halted within 1 minute of running 'Small FFTs - Stress CPU'
(Error message "FATAL ERROR: Rounding was 0.5, expected less than 0.4")

Any ideas welcome !
 
1.425V is already pretty high, though its probably drooping to about 1.375 under load.

Probably just a motherboard limitation, P35 chipsets are much better for overclocking.

Could also be your RAM, try setting the voltage to 2.1V many DDR2800 memory sticks will actually overclock worse using 2.2V, did you lower your memory frequency to begin with to keep its effective OC frequency closer to 800mhz?
 
I did lower my ram freq yes, had it on 750 MHz earlier. I have tried numerous ram timings all on 2.1 and 2.2v (5-4-4-12-2T, 5-6-6-12-2T, 5-5-5-15).

I was wondering seems orthos is failing only on CPU stress, not blend it was specifically a CPU issue. My older OC is 3.6 @ 1.28 Vcore, 26 IDLE 36 Load, maybe I should just give up and sit on 3.6 ;'(.
 
hi,

I am hitting a similar wall with my e8500.

4.0 unstable @1.33 to afraid to go higher
3.5 was possible @ 1.18 core
3.8 is stable @ 1.26 I think i will stick with this!
3.89 was stabe @ 1.26

Seeing intel states 1.365 is the max operating vcore for this chip i am not willing to go over it. Already needed 0.085 to go from 3.5 to 3.8 i am guessing stable 4 could need double this and this is to much for the 200 more Mhz extra i will be getting. It's already mega fast after being used to far slower chips.
 
Last edited:
I'd suggest both of you go looking for CPU vTT (also known as FSB voltage) and give it a small nudge. These 45nm parts like a bit of vTT loving for the higher speeds...
 
mm interesting,

You seem to own the same x38 ds4 board as me looking at your signature. Fsb voltage can only be set in i think increments of + 0.05 or something. No absolute values, and i am realy keen on absolute values. Where could i read some more about this vtt stuff ?

Also would it be realy worth it if i can run @ hight fsb speeds with low multi to play with this ?
 
This is surprising. When I first tried overclocking my E8500 I was able to get a stable 425MHz X 9.5 4GHz @ 1.368V Prime95 25.6 B6 stable & ran my games without issue. Maybe stay on a 1:1 ratio for now then experiment later on with different strap settings.
 

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I'm getting better FSB results & a slightly lower VCore. So far Prime95,rFactor & BMW M3 Challenge stable. Load temps running Prime. I'm gonna try 533MHz next time if this proves stable after a few days of stability testing.
 

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