2.8c more voltage not helping

[Ewok]

2.8c malay SL6WJ + P4C + SLK900 + 45cfm 92mm papst

1.5v = 3430 load temp 52c
1.55v = 3458 load temp 53-54c
1.565 = no gain
1.575 = 3486 load temp 55c
1.5875 = no gain
1.6 = no gain

idle temps are 40-41c for all tests.

.1v uncrease, temps only increased 3c over stock, and ive gained a pathetic 56mhz? now that cant be right surely. Im gonna try a 47cfm 80mm delta as it cools better but i would still expect a lot more gain than that from upping the voltage. is such a tiny gain normal?

on top of that is 3486mhz a good or bad overclock for a 2.8c using those voltages and cooling with those temps? im gonna want 4ghz+ stable when i get a mach2 but i dont know if this is a decent chip or not.

[Amoeba Assassin]

voltage doesnt make much of a dif with the "C" chips

[Ewok]

so is this a crap chip or wot? starting to look that way to me.

i have just reseated the heatsink and stuck the delta on it and its made absolutely no difference to temps what so ever, its still at 55c, and i now have the lovely acoustic addition which sounds like a jumbo jet taking off so im quite pleased with that.

also noticed that the slk900 doesnt cover the whole of a p4 core, the base of the hs leaves about 2mm each side of the p4 core that never gets touched so thats gonna help a lot im sure.

[Kunaak]

just curious.

wheres the chip from?
costa rica? malaysia? other?

[Tedinde]

Chips are still luck of the draw. I got a 2.8 over 7 months ago 533fsb, Still going. Does 3350 on air, and 3740 in my vapo. Some time's more volts or colder just doesnt make a difference. I've gotten 2.4's before in the past that wouldnt do over 2.65 no matter what.

Your gonna have to find that "good" chip if you want 4ghz, problem is 2.8's arent cheap, Not like going through xp1700's "B" to find that killer chip.

[MrIcee]

I've got the same chip my friend, 2.8c Malay SL6WJ and I've had it to 4036Mhz at 1.8v in the Prommy on my new IC7, benching 3DMark at 4010Mhz 14x286FSB. If I was colder I believe it would go even higher..such as seen by JC with his 404 charged Prommy and his 2.8c doing 4200Mhz.

Randi:D

[vertices]

I have that same stepping 2.8 from Malay MrIcee. I got mine up to 3985 for 3D Mark with water and pelts. Nice chip! :)

I got it up to 4067 for Sandra and Super Pi ! :)

I had the voltage up for testing but it does the exact same thing at only 1.7 Vcore.

http://www.irydium.net/pics/superpi.JPG

[Jupiler]

I've got exactly the same chip JC has (same FPO#) and I can't pass the 4Ghz barrier, no matter what voltage I'm using.
This with the IC7 and his modded Prom.
It runs fine at 3.8Ghz, 1.65V though. But that's not enough, I want more.:(
Guess I got a "crap" cpu and JC has a good one. :D The store we bought them only had 2 of those 2.8C.
So, It's just luck of the draw, simple as that.

[Creative]

I may as well join in :)

2.8C SL6wJ same as you guys.....doing 3925mhz 3dmark @ 1.68vcore. I can do Pifast and SuperPi at 4010mhz but not much else...:) I think it has potential for higher too but I think im limited by my ram crapping out....might have to try some new ram after exams :)

Seeing MrIcee mention he had his up to 1.8vcore has given me the motivation I needed to take my volts above 1.70....only for benching thogh :D
hehehhe

[Ewok]

hmmm but what can you lot get on air? otherwise ive got nothing to compare it to.

i cant go above 3486 1.575v since temps are 55c at that with case open and 61 with case closed and going up to 1,6v adds no speed at all. i think its a bit of a big jump to get 4gh stable in a prom if i can only get 3.48 with the best aircooling, especially as voltage is doing nothing for this chip.

im trying to convince a friend who has a 3.0c costa rica to swap my 2.8 with that and throw in 2x256mb corsair xms3500 cos he needs memory, i think that will do better than this chip.

[JeffPH]

is that load temps or idle? what cooling are you using?

[Creative]

Sorry ewok, should have mentioned :)

Benched at 250 and 260 fsb in 3dmark and pcmark at 1.58load vcore. To get it stable in prime/folding I had to either bump the volts up, which increased temps, or drop her back to 3550 and she was hunky dory :D

THis was with default intel cooler :)

[starck]

My SL6WJ Malay 04/04/2003 2.8C is doing 275x14 with 1.65vcore, anything more than this I cant boot into windows, and it was prometeia cooled. Tried on both IC7-G and P4C800, also tried with BH-5 and A-DATA -45ns DDR450, and thats a no go colonel :(
Its just a matter of luck I'm sure.

starck

[Jupiler]

starck :

Can you give me your idle/load temps at that speed and voltage?
thx.

[starck]

Originally posted by Jupiler
idle/load temps at that speed and voltage?
[/B]

Sure thing Jupiler :)

275x14 = 3.85ghz@1.65v, 1.675 in bios, IC7-G

Temp by Winbond monitor

Idled 5 mins after power-on
Evap -40C
CPU -15C
System 33C
PWM 11.50

Prime95 loaded 5 mins, still running
Evap -31
CPU 9-10.50 fluctuating up and down
System 33
PWM 19

room temp around 22C, with 2 80cfm delta case fans@7v, NB with Zalman heatsink+Abit NB fan.

The loaded temp seems to be off, I dont think with 1.65v the temp will go higher than 0C :confused: , I did the "Pilsy Prommy mod", cut the legs of the hermetic cell a bit to get more pressure.

Didnt check the temps for the P4C, I actually like that board but its not working with the prommy even with the ATX conditioner :(

starck :)

[Jupiler]

Thx m8 :toast:

Your temps are about the same as I have. According to JC, his temps were 10° lower (same setup). That's why I'm wondering if something's wrong with my board/cpu, or if the Prommy was installed badly. Still haven't figured it out.

272*14 = 3808Mhz, 1.65V (bios), IC7, modded Prommy (404a).
Winbond monitor is used for temps.

CPU Idle : -20.50°C
System : 24° (now). It cooled down now after some very hot days.
PWM : 7.50°
CPU Load : -12.50/-13.50 (fluctuates between the 2)
System : 25°
PWM : 13.50°

Room temp : 23°c right now. Much better, after hitting 27° over the weekend. :D

[starck]

Originally posted by Jupiler

Your temps are about the same as I have


duh, you have much better temp with R404 :D

i think most people are getting inaccurate temps like 10C higher or so, according to abit's forum, but im not expecting anything higher than 0C :stick:

i noticed that when im runnin prim95, the temp went up to around 9-10, but then when i stop the torture test, it drops immediately back to around -10c or so :confused:

[Jupiler]

+9°C load??
Are you sure that the Evap is making full contact with the cpu? Because +9°C looks way to high to me.
Both our systems are the same, except that my Prommy is a bit stronger than yours. But 22°c difference between our 2 setups looks way to much.

[starck]

right, no kidding, when i was running prime95, i checked the temp via that winbond thing, and the cpu temp was fluctuating between 9-10.50, but then like i said, when i stop the prime test, the temp immediately dropped back to -10c, i mean immediately, thats like 1-2 sec. and im sure that i have pretty good contact.
but hell i know that wont be the true temp, or shall i say i dont wanna face the truth :D

[Creative]

I know you guys have prommys, but are my temps doing ok do you think?

2.8 @ 3.9 @ 1.68vcore when on load (folding, priming etc) = 18-19dc and when she idles, she idles at about 1-2dc. This is according to Winbond.....the temp on my Vapo reads -28dc when idle and then -15 to -14dc when load.

This is with a Vapo PE version. Im sure I have the head on correct. All I have to do is line up the holes and screw till it cant be screwed anymore....and Ive done that, so I dont think I can get any better contact.....

Hmmmmm cheers guys
:)

[Vatt]

Interesting information in this thread. I have been looking for similar setups as mine with Prometeia so I could compare temps.

I have an IC7-G with a P4 3.0(800) @ 3894 Mhz @ 1.700v and UNmodded Prometeia. Also I have not done the PilsY modding guide, I just used the standard UNmodded CPU-kit.

Idle:
Evap: -34
CPU : -17
System: 29
PWM: 9

Stressed:
Evap: -29
CPU : 1
System: 30
PWM: 19

I sure am having a hard time getting good contact between the CPU and the evaporator head. It's almost like the copper evaporator head isn't straight at all and shifts from left to right(like it balances in the middle)

[starck]

Vatt I had the same problem, due to the twist of the evap head, but it was fixed after doing the mod, cutting the legs and i actually added some washers to make the screws tighter.
but still i think the temp in winbond is broken especially the loaded temp.