Help my 2.4c break the 3ghz barrier!!!!!

J

jonas007

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Joined

Feb 17, 2004

• Apr 15, 2004

• #1

My system:

Abit IS7-E
2.4c @ 3ghz, 1.55v, 5:4 divider
512 Corsair XMS Ram @ 2.8v
9800 Pro

Divider is 5:4
agp/pci if fixed
ram is at a,n,a,d,d and set to SPD
HT is disabled
Switched dimm's, didn't work

Any idea on why I can't get past 3ghz? It's prime stable at that speed. Any idea's?

 

cack01

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Joined

Mar 7, 2002

Location

San diego or UC Davis

• Apr 15, 2004

• #2

hows your cooling? Does upping the Vcore help stabilty at all above 3Ghz?

 

Sophisticated

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Joined

Oct 15, 2003

Location

Missouri

• Apr 15, 2004

• #3

disable SPD and make sure your RAM is at its default timmings..n yes up your Vcore a Tad more and try again & why do you have HT disabled????

 

R

reef

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Joined

Mar 6, 2003

Location

Yorkshire, UK

• Apr 15, 2004

• #4

You've hit the notorious i865/i875 + Winbond CH5 memory chip brick wall. It causes an inability for the FSB to be raised above anywhere from 250-270MHz regardless of memory timings or ratio.

I used to have some Twinmos with Winbond CH5 in my rig and I hit that brick wall at 266MHz FSB, using the 5:4 divider. 267MHz FSB wouldnt even post even at 3:2 divider, which put my RAM at below DDR400. Changing timings and voltages didnt make a difference either, all this despite the fact the processor was prime stable at 266MHz FSB.

In the end, I ordered some Winbond BH5 based RAM, and now Im sat at 300MHz FSB using the 3:2 divider for 3.6GHz using 1.65v.

 

H

hrhrhrFOOT

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Joined

Sep 22, 2003

• Apr 15, 2004

• #5

^ he summed it up perfectly.

 

F

Fast420A

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Joined

Jan 8, 2003

Location

Tampa, FL

• Apr 15, 2004

• #6

Tried more voltage to the ram? My 2.4C is at 275 FSB right now with a stick of Corsair XMS PC3200 v1.1 running 5:4 (220FSB) 2,2,2,6 @ 3.0v with the Vdimm mod on my P4P800 with the i865 chipset. My PC4200 should be here today to let me run 1:1 at those speeds, and then faster after I get off air cooling with this rig.

 

OP

J

jonas007

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Joined

Feb 17, 2004

• Apr 15, 2004

• Thread Starter
• #7

2.8v is as high as the IS7-E goes, any clue as to how I could pump more into it?

I'll try raising the Vcore, but I believe I did try it once and it didn't work. I'll let you know.

 

OP

J

jonas007

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Joined

Feb 17, 2004

• Apr 15, 2004

• Thread Starter
• #8

Well, I tried setting the ram to "manuel" and set the timings to 2,3,3,7. No dice. Then I tried loosening up the timings to 3,4,4,7, nada. Upping the vcore to 1.65 didn't do anything either. AHHH!!!! I REALLY wish I had know about the whole ch-5/bh-5 deal before I got the ram. Oh well.

 

Dark_templar

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Joined

Mar 6, 2004

• Apr 15, 2004

• #9

Did u set ur PSB to 800mhz ?

 

OP

J

jonas007

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Joined

Feb 17, 2004

• Apr 16, 2004

• Thread Starter
• #10

Yes I did. Alas, I think I'm stuck until I get new RAM.

 

(HR)Titan

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Joined

Jan 5, 2003

Location

Italy

• Apr 16, 2004

• #11

just try raise vcore to 1.85
for test

 

Lat

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Joined

Mar 1, 2004

Location

Vancouver (Canada)

• Apr 16, 2004

• #12

ummm...NO...don't raise vcore to 1.85

 

tekOC

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Joined

Feb 23, 2004

Location

Apt 2

• Apr 16, 2004

• #13

(HR)Titan said:

just try raise vcore to 1.85
for test

Click to expand...

NO, please dont do that - are you serious Titan?

 

OP

J

jonas007

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Joined

Feb 17, 2004

• Apr 16, 2004

• Thread Starter
• #14

Lol, no. I won't do that.