oc question and cooling

[OBLIVIONLORD]

I increased the vcor to 1.75 and the dram to 2.6 using a p4p800-Deluxe p4 3.0c oced to 3.5. My temps are at 45 idle and 57 full load. Im 1:1 Cosair 3700 ddr 3,4,4,8

I ran 2 instances of Prime95. 1 for memory an 1 for cpu. Both combined they used all my vmem and physical along with the cpu100%. I got no fails running for 30 minutes and yes that is alot of pressure on the cpu since its 57 so i only did 30 minutes.

When i get the SP-94, Panaflo 92mm, Artic 5... what would you guess my temps would be?

Second question. Is the vcore alright where its at when I use the heatsink or will it still be too much? Im not occing now, every voltage is at stock setting. When i ran it at 1.67 i got prime95 errors but not at 1.7 and the dram needs to be at 2.6 or i get prime errors. Maybe after the heatsink lowers the heat ill be able to lower the voltage for it to be stable? I heard somewhere that if your higher then 55 youll get errors left and right. Im on an asus so the bios is sure to tell the actual heat and using MBM5 in windows while in full load.

 

[Grandpa Dan]

Anything over 1.7 runs the risk of SNDS no matter how you cool it. That corsair could probably use more voltage...like as much as that board will give it. I won't run my vcore above 1.65 it's an unnecessary risk.

 

[OBLIVIONLORD]

Ok lets say i do go down to 1.6 now you say i should pump the ram voltage to the highest i can go which is 2.9 now will that hurt and that will help the error problem in prime95?

 

[UnrealCpu]

i got a 3.0c sl6wu it can go as high as 3650mhz sometimes stable with games. Very stable at 3550mhz in any program.

i have watercooling and my heatspreader is off but i get
36c idle
45c load at 3600mhz

you wont get any higher no matter what unless you have prometia.
but yeah 1.65v is where you want it . Its too high if your past that

 

[OBLIVIONLORD]

I just did 2 instances of Prim95 simultaneously at 3.5ghz, vcor 1.6 and 1.65 with ram at the highst 2.8 and i failed within seconds. The heat did go higher then 53c. When i was at 1.7 with ram volt at 2.6 i passed both and was a little higher then 55c.

Does this mean I can scratch off 3.5 unless i want to hit 1.75volt doing flawless prime95 tests and risking SNDS?

 

[batboy]

Yep, you need 1.75v vcore to be stable and like Gramps says, you are risking CPU damage at that high of voltage. Maybe back off to 3.4 gig and see what happens?

 

[Grandpa Dan]

Is it a stock heatsink? Maybe try resetting it with some as3 or as5. that might help temps if really feel compelled to run a vcore higher than 1.65v.

 

[OBLIVIONLORD]

You said if anything higher then 1.65 then SNDS so why even bother?

 

[Grandpa Dan]

good answer!

I am currently putting 3.15v to the ram. to answer the question on ram voltage.

 

[OBLIVIONLORD]

If i stay at 53-55c for 24 hours at full load what harm will come to the cpu?

 

[Grandpa Dan]

You should be fine. Thats a little warm but 60 C is the redline. Plus the P4's use thermal throttling. If itstarts running too hot it will automatically throttle back. If an acceptable temp. it not reached in an alotted time frame the cpu will shut down.

 

[OBLIVIONLORD]

What would the life expectancy be for the chip if I keep it constantly at 55c? I'm wondering if its worth the 70 dollor investment for heatsink/fan just to keep it cool around 45c. If it doesnt cause permanent damage running at 55c all the time then should I even wory?

 

[Grandpa Dan]

55 C IMO is a little hotter than I would like 24/7. $70 is a bit steep for air cooling. Look at this HSF. It's one of the best out for the P4. http://www.svcompucycle.com/zaulqucpuco.html

 

[OBLIVIONLORD]

Well I was looking at the SP-94 which is $45 along with a 92mm Panaflo Fan & 3 Pin Tail for $12. Thats $57. Then add 8 bucks for Artic 5 and you got $65 before S/H which is around $70 and like you said thats a bit high.

The Heatsink/Fan combo you showed me was a nice $38 before s/h but, how does this compare to the quality of the SP-94 and the fan I sudjested? Were you using this as your colling source before you went to water cooling? THanks

 

[Grandpa Dan]

There was no "before" water cooling w/ my P4 setup. I did install the zahlman on a similar P4 setup I built. I saw temps decrease 10-15 F , from 115-125 f to 100-110 F. I don't know how the 2 compare.

 

[OBLIVIONLORD]

Last question,

If I increase the voltage and it goes to high temps ill have stability issues but if i lower the temp with a heatsink etc at that same voltage will it still give me the same stability issues or will the lower temp suddenly add stability?

 

[Grandpa Dan]

Last question,

Whatever...


Lower heat increases stability. However above 1.7 there is still a risk of SNDS regardless of temp.