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Overclocking Asus P4C800-E Deluxe and P4 3.4 Precott

post #1 of 3
Thread Starter 
Ok guys, what am I doing wrong?

For the new year, I decided that I would try to squeeze the last bit of horsepower out of my P4C800 via overclocking.

I consider myself reasonably computer literate, but this one has been annoying.

First, this is my business machine, so I have to have rock solid stability. Checking this with Prime95

Ok, the basics:

P4C800-E Deluxe (bios 1023) {no mods}
P4 3.4 Prescott (socket 478)
Muskin PC3500 Level2 2x512
Cooling=excellent air cooling on CPU and case. (cpu=98 f and case=78 f)

Bios Before:

Overclocking=Standard
CPU Ratio=17
Performance Mode=Auto

CPU Unlocking=Disabled

Dram by SPD=Enabled
Performance Mode=Auto
DRAM Idle Timer=Auto
DRam Refresh Rate=Auto

Spread Spectrum=Enabled
ICH Delayed Transaction=Enabled

>> Rock Solid, no errors at all with Prime95

Bios After:

Overclocking=10%
CPU Ratio=17
Performance Mode=Auto

CPU Unlocking=Disabled

Dram by SPD=Enabled
Performance Mode=Auto
DRAM Idle Timer=Auto
DRam Refresh Rate=Auto

Spread Spectrum=Enabled
ICH Delayed Transaction=Enabled

>> Immediately start taking errors with Prime95

I spent a serious part of a day trying all sorts of different combinations of Bios settings, all to no avail. No matter how tried the settings, even a little uptick in the fsb, I immediately started getting errors in Prime95.

I am not interested in the motherboard mods. I know, what am I doing considering overclocking for then? Especially with the memory I have. Basically, I just want to be able to squeeze 5-15% more on the horsepower out of this excellent motherboard/cpu setup.

Anyone got any ideas?
post #2 of 3
Thread Starter 
Ok, I learned 2 things while posting this thread:

1) My current system is outdated

BUT, for its age it does great, and it IS stable.

With this realization, I got my eye on an Asus P5W DH Deluxe and Intel Duo E6600. This looks to be a screaming combination.

Swore I was not going to upgrade in 2007. Might have to reconsider if the prices come down a tich.

2) Here is how I was able to get some more horsepower and stability.

Overclocking=Manual
CPU Bus Speed= 223
DRAM=320 (ratio 5:4)
CPU Vcore=1.475
DDR Ref Voltage=2.75

Dram by SPD=Disabled
Performance Mode=Auto
Memory set=3,4,4,8,8

DRAM Idle Timer=Auto
DRam Refresh Rate=Auto

Spread Spectrum=Disabled
ICH Delayed Transaction=Enabled

Runs stable, I got 11.5% increase in horsepower. Memory is sloppy, but thats life. Heat increased 5 degrees Far., which I can live with.
post #3 of 3
Welcome to the forums. Please complete your system specs in your User CP so we can help you better.

Yes, your system is a few generations behind the times, but it's far from obsolete. You may be able to psu that to 4.0 GHz, which would make for a very solid computer in most applications.

When overclocking, leave Spread Spectrum on disabled. With PC3500, set the RAM speed to DDR400 at least until you get to 250 MHz or so. Be sure to lock your PCI and AGP frequencies at 33.3 and 66.6 MHz, respectively. The PCI lock in particular can cause problems at low overclocks if it's not set.

If you do upgrade to a Conroe, you may want to consider the P5B Deluxe. It's a bit cheaper than the P5W, and it does offer a few advantages (I have a P5W and like it, and I just got a P5B today).

Give the PCI/AGP locks a shot and see if that doesn't give you a bit more room to OC.
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Intel Q6600 G0 23A Asus P5K Deluxe Wifi HD 3870 2x2 GB G.Skill DDR2-800 
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Sig rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 G0 23A Asus P5K Deluxe Wifi HD 3870 2x2 GB G.Skill DDR2-800 
Hard DriveOptical DriveOSMonitor
2x250 GB Seagate RAID 0 + 320 GB Seagate Samsung SATA DVD Windows XP Pro/Vista Ultimate 64 bit Viewsonic VA2012wb 
KeyboardPowerCaseMouse
Saitek Eclipse Corsair HX620 Lian Li V2000b Logitech G7 
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