P4C800-E >1.825v bios unless for P4 EEs ?

[eva2000]

I have an unmodded stock Asus P4C800-E rev2.0 with 1016 bios. Using Corsair Hydrocool water cooling unit

Now I have a 3.2EE on P4C800-E and anytime i set 1.85v to 1.95v vcore bios options the pc won't boot but at 1.825v I can bench at 247-256fsb a bit. 1.825v in bios is 1.696-1.712v vcore under load.

all @ 1.825v in bios

idle overvolts to 1.824-1.856
load undervolts to 1.696-1.712-1.724v

http://www.fileshosts.com/pentium4/D1/asus/p4c800e_results/HC200_results/3.2EE/OCZ/PC3500LE/2x512/256-256-2226-8-inf-64u-1.825-3.5-1.7_STD_PAM/cpuz.jpg

http://www.fileshosts.com/pentium4/D1/asus/p4c800e_results/HC200_results/3.2EE/OCZ/PC3500LE/2x512/253-253-2226-8-inf-64u-1.825-3.5-1.7_STD_PAM/superpi-1m.jpg

http://www.fileshosts.com/pentium4/D1/asus/p4c800e_results/HC200_results/3.2EE/OCZ/PC3500LE/2x512/250-250-2226-8-INF-64u-1.825-3.4-1.7_STD_PAM/superpi-1m.jpg

http://www.fileshosts.com/pentium4/D1/asus/p4c800e_results/HC200_results/3.2EE/OCZ/PC3500LE/2x512/250-250-2226-8-INF-64u-1.825-3.4-1.7_STD_PAM/superpi-2m.jpg

http://www.fileshosts.com/pentium4/D1/asus/p4c800e_results/HC200_results/3.2EE/OCZ/PC3500LE/2x512/250-250-2226-8-INF-64u-1.825-3.4-1.7_STD_PAM/superpi-4m.jpg

On my Abit AI7 the same 3.2EE only does 245-249fsb at 1.875v vcore which is 1.78v under load.

So is this the P4C800-E droop issue playing up ???

[LarsK]

I think heat is the main issue here. For the cpu to work properly with that amount of Vcore is just needs to be much cooler.

I had no issues booting and benching with my P4C800E and my 3.2EE @ 1.95V in the bios. However it would drop to the same level under load, as when set @ 1.875 in the bios, so adding extra Vcore over the 1.875 setting in bios did nothing to improve 24/7 stability. Here's a little SS of it running @ 1.95V

[eva2000]

thanks

i did some calculations and yup 1.9vcore with 3.2EE 109W heat at 245-249fsb would tip over 200W of heat and my Corsair Hydrocool is rated at 200W...

at 1.825v vcore and under it's <200W

so what i did was lower vcore to 1.8v and guess what 3dmarkable @ 3.2EE@251fsb at 1.8v vcore and 1.728v load

3dmark2003 = 14,150
http://service.futuremark.com/compare?2k3=2917447

So i guess the droop mod helps so that the idle overvolted vcore and hence >200W heat output is kept in control

[bito]

Eva....do you prefer the P4C800E to the Abit ??

[LarsK]

Originally posted by eva2000
thanks

i did some calculations and yup 1.9vcore with 3.2EE 109W heat at 245-249fsb would tip over 200W of heat and my Corsair Hydrocool is rated at 200W...

at 1.825v vcore and under it's <200W



I think I'm quite close to the 200W mark as well. Running SuperPI 32M @ 4.4 Ghz and 1.875V in the bios the other day (ambient temp around 30°C/85°F) the display on the Mach II GT was up to -42°C. According to the manual it should go up to -38°C @ 200W's, so I'm sure it's very close to 200W

[eva2000]

yeah so to go higher you need more powerful phase change cooling hehe or a cpu that doesn't give off so much heat

as to AI7 vs P4C800-E the AI7 is 1/2 the price of the P4C800-E and while cpu benchmarks P4C800-E are slightly better than AI7

here's my top 2 scores on 2 boards

Gecube X800Pro 12 pipe

with cat 4.7betas

#1 on Abit AI7 865PE = 14,156 (http://service.futuremark.com/compare?2k3=2683455)

#2 on Abit AI7 865PE = 14,153 (http://service.futuremark.com/compare?2k3=2759493)

so far (Just started testing yesterday)

with cat 4.9betas

#1 on Asus P4C800-E = 14,151 (http://service.futuremark.com/compare?2k3=2917800)

#2 on Asus P4C800-E = 14,150 (http://service.futuremark.com/compare?2k3=2917447)

but seems AI7 still has a bit of power lying in it's GAT/bios tweaks that still allow it to get better scores at lower fsb than P4C800-E board and that's with slower cat driver 4.7beta than 4.9betas for 3d2k3 at least

[hoop]

hey eva2000 where did you get that progam where you can see what you got?can you give me the link or something so i can see what all i got?

[freecableguy]

Anything above 1.825 with my EE results in BSOD on boot.

[eva2000]

hoop you mean cpuz from www.cpuid.com

[hoop]

o hell ya thank you sir:cool:

[Kunaak]

I use to have this issue with my P4P800 with my old 2.8C, even when cooled well below zero.

I think it has something to do with the revision of the motherboard.
thats the only explanation I got a long time ago, as to why that would happen. I never found a way past it on that board.

[eva2000]

well i definitely think my issue is with heat output once i goes over 200W

just benched 3.2EE@250fsb with 1.8v in bios with 1.728v underload http://service.futuremark.com/compare?2k3=2927781

[hoop]

say guy's the higher you set your mother boards volts to cpu is that good or bad and will it give you more proform...???

[freecableguy]

Increasing the voltage is sometimes needed to force a CPU to operate stable at a higher frequency. My 3.4EE ES actually runs 600Mhz higher than stock with no extra volts.