How to get some more out my CPU

Original Message

Name: 02coled
Date: August 24, 2006 at 11:53:29 Pacific
Subject: How to get some more out my CPU
OS: Windows XP Pro SP2
CPU/Ram: Pentium 4 3.2ghz, 1gb Cru
Model/Manufacturer: ME no more left of the de

Comment:

hello people
ok finally got my secound rig sorted heres the specs:
Asus p4p800-se
pentium 4 3.00Eghz, skt 478
1gb pc2700
300w PSU, single 12v rail
coolermaster aluminium cooler (pretty poor)
uprated coolermaster HSF on the chipset
anyhow im Overclocking so my settings are
CPU FSB = 250Mhz
CPU vcore = 1.525v
Mem voltage = 2.65v
AGP VDDQ voltage = 1.50v
AGP/PCI = 66/33Mhz
Ram Freq = 320
which gives me 3.75ghz
But i cant go anymore and i heard people goign thurther i have tried pushing up the vcore when pushing up the CPU FSB but still it wont post i just get a black screen and so i have to restart and it resets the CSMOS.
what next can i try to get a higher OC as im aiming for 4ghz on air cooling current temps are 45-50 celecius idle and MB at 28celcius
thanks
Damian Cole

Pentium4 3.20ghz@ 3.5ghz
1Gb Crucial XMS PC3200CL2
1 X 80GB HDD OS
1X 40GB HDD STORAGE
NVDIA GeForce4 MX4000 Pro
ASUS P4-U800-X
600w PSU 12v 1-14amp
2-15amp
WinXp

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Response Number 1

Name: TMP-Man
Date: August 24, 2006 at 12:32:10 Pacific
Subject: How to get some more out my CPU

Reply: (edit)

Do you have the northwood or the prescott core? If you have northwood, max vcore would be 1.7v and prescott is 1.525v... Seems like you are doing the FSB overclocking and I believe the Asus PxP800 series does not have a northbridge cooler and thus FSB overclock can be difficult after 250Mhz. So one solution would be to buy a fan attach to the northbridge and raise the AGP VDDQ voltage from 1.5v to 1.7v with the fan to see if that gives you more FSB. Somehow the AGP VGGQ voltage = Northbridge voltage and they misspell it...
TMP-Man
Asus P5P800-SE PAT
P4 506 @ 4009Mhz 1.3625v
Thermaltake CLP0024 w/ 1700RPM 92MM + AS5
2GB OCZ 2-3-2-5 DDR400
120GB/300GB 7200RPM HD
MSI 6600GT AGP 565/1100 VF700 ALCU AS5

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Response Number 2

Name: TMP-Man
Date: August 24, 2006 at 12:33:30 Pacific
Subject: How to get some more out my CPU

Reply: (edit)

"I believe the Asus PxP800 series does not have a northbridge cooler "
What I meant was cooling fan...
TMP-Man
Asus P5P800-SE PAT
P4 506 @ 4009Mhz 1.3625v
Thermaltake CLP0024 w/ 1700RPM 92MM + AS5
2GB OCZ 2-3-2-5 DDR400
120GB/300GB 7200RPM HD
MSI 6600GT AGP 565/1100 VF700 ALCU AS5

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Response Number 3

Name: jam
Date: August 24, 2006 at 12:58:23 Pacific
Subject: How to get some more out my CPU

Reply: (edit)

"Ram Freq = 320"
Shouldn't it be 250MHz to match the CPU? In other words, 1:1 ratio?

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Response Number 4

Name: Mr.Noobie
Date: August 24, 2006 at 21:01:23 Pacific
Subject: How to get some more out my CPU

Reply: (edit)

I doubt his pc2700 RAM can handle 250Mhz in a 1:1 ratio. In order to run in sync with the CPU FSB, he would need pc4000 (500Mhz DDR) Ram. I have no idea what ratio your running at right now, but let me give it a shot. Even at 5/4 you would need pc3200 ram, 250x15(multiplier)=3750MHz; 250x4(Quad Pumped)=1000Mhz FSB; 250/5=50x4=200Mhz. At a 4/3 ratio your ram would run at 188Mhz (375Mhz DDR). So i assume your using 3/2 (if there is such a option) that would give you 250/3=83x2=166Mhz or pc2700 (333Mhz DDR).
Post a screenshot of CPU-Z if you dont mind, both memory and CPU tab shots.
http://www.cpuid.com/download/cpu-z-136.zip
TMP-Man, does that AGP VDDQ voltage which really means Northbridge Voltage, apply to Abit boards aswell? I thought is was for the AGP BUS = 1.5v.
Prescott 2.8Ghz Oc'ed @ 3.6Ghz; 5:4 ratio
Abit Is7-E Motherboard, i865-PE Chipset
Muskin pc3200 Enhanced, 412Mhz; 2.5-3-3-6
Pny 6800nu; 430Mhz 820Mhz; 16p,5vp
Two 36Gb Raptors in raid0 a

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Response Number 5

Name: TMP-Man
Date: August 24, 2006 at 21:55:47 Pacific
Subject: How to get some more out my CPU

Reply: (edit)

"TMP-Man, does that AGP VDDQ voltage which really means Northbridge Voltage, apply to Abit boards aswell? I thought is was for the AGP BUS = 1.5v."
2X AGP = 3.3v
4X AGP = 1.5v
8X AgP = 0.8v
So if you have 8X AGP, how can you get to 1.5v in the BIOS? If that is not the northbridge voltage, what else can it be?
TMP-Man
Asus P5P800-SE PAT
P4 506 @ 4009Mhz 1.3625v
Thermaltake CLP0024 w/ 1700RPM 92MM + AS5
2GB OCZ 2-3-2-5 DDR400
120GB/300GB 7200RPM HD
MSI 6600GT AGP 565/1100 VF700 ALCU AS5

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Response Number 6

Name: 02coled
Date: August 25, 2006 at 03:02:28 Pacific
Subject: How to get some more out my CPU

Reply: (edit)

hello
yes it is a Prescott hence the "3.00(E)" and yes i do have a uprated heatsink (thermaltake tiger) which keeps it 2 celcius cooler OC than with the aluminum ASUS one.
Ill take CPU-Z shots when i get back home and il try bumping up the northwood voltage to 1.7v as suggested. As every one else i thought it was the AGP slot voltage.
thanks
Damian Cole
Pentium4 3.20ghz@ 3.5ghz
1Gb Crucial XMS PC3200CL2
1 X 80GB HDD OS
1X 40GB HDD STORAGE
NVDIA GeForce4 MX4000 Pro
ASUS P4-U800-X
600w PSU 12v 1-14amp
2-15amp
WinXp

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Response Number 7

Name: jam
Date: August 25, 2006 at 06:48:23 Pacific
Subject: How to get some more out my CPU

Reply: (edit)

"I doubt his pc2700 RAM can handle 250Mhz in a 1:1 ratio"
I didn't notice the PC2700...I was looking at his sig & saw "1Gb Crucial XMS PC3200CL2"
Since that's the case, the PC2700 RAM is running considerably slower than the CPU & will bottleneck the system.
CPU at 250MHz = 8000MB/s bandwidth
PC2700RAM at 320MHz (in dual channel mode) = 5120MB/s bandwidth

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