Is it bad to lower VCore?

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Nights_L

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Hey guys
It's getting hot, although I don't have any overheating issue, but by curiousity, I lower my 2700+@2166Mhz to 1833MHz, and then lower the cpu voltage to 1.55V (As bios shows)
Usually, I let Bios to determine the voltage, which is set to 1.65V, but shows as 1.60V, so now I set to 1.60V, it shows as 1.55V
It decreases cpu temperature by about 3 to 4 degrees, but i'm curious if it's bad for the processor?
Or like rule #1, if it's stable, it's not a problem? I could even set a lower VCore if I wish?
 
E

endyen

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If it's stable it's not a problem. You can lower it more, so long as it stays stable. The only difference between your chip and a mobile chip, is how and why it was binned.
 
SidVicious

SidVicious

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@ Nights_L :

Chances are that your CPU would run fine at stock speed on 1.5V, my early 1800+ Thoroughbred-B ran at stock speed on 1.4V

I had a Duron Morgan that was stable at 1GHz on 1.3V, just download and run <A HREF="http://www.mersenne.org" target="_new">Prime95</A> Torture Test and keep lowering the Vcore until you start running into errors.





Fok Speling Misstake
 
C

ChipDeath

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I recently reduced my overclock a little as my rig was getting a bit warm, and found that it needs less than 1.5V for 2Ghz! (needed 1.58 for 2.26Ghz), so I would also suggest seeing how low you can get it at stock speed first.

---
Epox 8RDA+ V1.1 w/ Custom NB HS
Summer's here! so ease off the overclock...
XP1700+ @166x12 (~2Ghz), 1.475 Vcore
2x256Mb Corsair PC3200LL 2-2-2-4
Sapphire 9800Pro 400/730
 
W

Woodman

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Set thine multiplier to the lowest as thine motherboard alloweth, and thou shalt feel the cur'sed heat of hell taken away from thee. Thine flesh shalt be bles'sed of much coolness. Shed all thoughts of doubt and guilt in thine heart, for therein lies the path of the damned.

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<font color=purple><b>Update:
AthlonXP 1800+ (1.53GHz) to AthlonXP 300+ (0.55GHz) on air. Underclock successful :).</b></font color=purple>
 
N

Nights_L

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Currently setting at 1.55V@1833MHz (motherboard monitor or any software shows as 1.5V)
No problem so far
Will the computer refuse to boot if I set the VCore too low?
or it will only crash while stressing it?
I want to mention that, I don't know which Voltage is correct one, the one i set, or the one it shows
it's an Abit NF7
 
N

Nights_L

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A little update
While VCore is setting at 1.55 (1.50) @ 1.83GHz, I got a "Convergent Error" While running Super_PI for a calculation of 32Mb toward the end..I'll try to up VCore by 0.025 and see what will happen again.
 
C

ChipDeath

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Will the computer refuse to boot if I set the VCore too low?
Click to expand...
If you set it low enough - but if you decrease in small enough steps you should never get that problem. It's just like overclocking - if you increase in small steps you're fine, but if you just try to suddenly boot a T-bred at 3Ghz it'll probably refuse to boot.

---
Epox 8RDA+ V1.1 w/ Custom NB HS
Summer's here! so ease off the overclock...
XP1700+ @166x12 (~2Ghz), 1.475 Vcore
2x256Mb Corsair PC3200LL 2-2-2-4
Sapphire 9800Pro 400/730
 
Snorkius

Snorkius

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probably?

A long long time ago, but I can still remember, how that music used to make me smile... <A HREF="http://www.nexus.hu/zonix/DIGGER.MID" target="_new"><b><font color=blue>Digger rulz</font color=blue></b></A>
 
C

ChipDeath

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If it's floating around in space, on the earth's nightside then it might boot up :smile: ... (ambient < -250C)

---
Epox 8RDA+ V1.1 w/ Custom NB HS
Summer's here! so ease off the overclock...
XP1700+ @166x12 (~2Ghz), 1.475 Vcore
2x256Mb Corsair PC3200LL 2-2-2-4
Sapphire 9800Pro 400/730
 
Spitfire_x86

Spitfire_x86

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Undervolting can't cause harm to CPU. It may create stablity issues if you undervolt too much.

My Duron 1 Ghz runs 100% stable at 1.5v (undervolted from default 1.75v). It becomes unstable at lower than 1.5v

------------
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<A HREF="http://geocities.com/spitfire_x86/myrig.html" target="_new">My Rig</A> & <A HREF="http://geocities.com/spitfire_x86/benchmark.html" target="_new">3DMark score</A>
 
N

Nights_L

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damn
my other motherboard won't allow me to set lower than 1.725V for my Duron 1GHz..
btw, u have an Abit NF7 right? does it happen to you that the voltage showed by programs is different than the one you set in Bios? for me, there is always a 0.05V difference

Another update:
It seems that 1.525V (1.575V?) is the stable voltage for 1.83GHz, it complete to looping in super pi..maybe now i'll try to raise clock speed.
 
T

Tavelkyosoba

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scotchen said its not, so that means its not!

my house is hot in the summer too so i decided to underclock.

i have my xp 2400 underclocked to 1.4 ghz with only 1.15 volts to the core. i have almost no ingame performance loss and my chip now idles at 32 degrees. now thats a beezy cpu.
 
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Tavelkyosoba

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must've hit it twice, i cant delete this one so ill just apologize.<P ID="edit"><FONT SIZE=-1><EM>Edited by tavelkyosoba on 06/08/04 01:07 PM.</EM></FONT></P>
 
Spitfire_x86

Spitfire_x86

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I have NF7 v2.0. I think your BIOS is backdated and newer BIOS may allow much wider range voltage selection. I can chose all available voltages for my CPU.

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N

Nights_L

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nono..
I have the 2700+ on NF7 v2.0, which allows me to select wide range of voltage, sth strange is that whatever i choose, say i set to 1.65V, when i go into windows, cpu-z, mbm5, aida32..all of them will show cpu voltage as 1.6V. There is always a 0.05V difference between them

when I was talking about the Duron, it's on a MSI's mobo, not the NF7.. :tongue:
 
C

ChipDeath

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Some boards Undervolt very slightly, others overvolt slightly. Mine tends to overvolt slightly. 1.575V gives me 1.58 in most monitoring programs (so the 1.475V in my sig should <i>really</i> be ~1.48... oops.. :redface: )

---
Epox 8RDA+ V1.1 w/ Custom NB HS
Summer's here! so ease off the overclock...
XP1700+ @166x12 (~2Ghz), 1.475 Vcore
2x256Mb Corsair PC3200LL 2-2-2-4
Sapphire 9800Pro 400/730
 
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CaptainNemo

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My board only allows undervolting to 1.35V, which is pain because I doubt that an XP1800+ (default 1.5V) needs that much when running on a 6x multiplier* (800Mhz)

*(It's baking today, and my PC is running in nekkid/disassembled mode with no fans apart from the heatsink one; I was idling at 50 degrees C...)

Axis of Stupid = coop, Kanavit, FUGGER, SoDNighthawk, and ninkey.
 
phial

phial

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mine will do 2400mhz @ 1.50vcore



I OWN YOU

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scottchen

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I've just noticed the other day how overvolted athlon64s are, i got mine running at 1.45Vcore, while overclocked to 2100mhz from 2000mhz, at stock i could lower it to 1.375.

<A HREF="http://forums.extremeoverclocking.com/myrig.php?do=view&id=17301" target="_new">My PC</A>
 
phial

phial

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hmm youd think it would give them more headroom, but A64's arent known for their overclockability



btw i wonder whats better, an A64 2.1ghz, or a AXP 2.5ghz :)

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scottchen

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Let's compare at 1.7, because at that i can go to 2.4 :D I don't care if you can go to 2.8 i'm gonna win:)

Let's both run at 1.5V, i'm at 2250

so Athlon64 2.25G vs AXP 2.5G

<A HREF="http://forums.extremeoverclocking.com/myrig.php?do=view&id=17301" target="_new">My PC</A>
 
phial

phial

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oh dude, that will own me.




:(



shoulda saved up an extra month and got a A64. but it would have been 3x the price

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S

scottchen

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LOL, even with the socket939 release, the s754 is still priced fairly high.

<A HREF="http://forums.extremeoverclocking.com/myrig.php?do=view&id=17301" target="_new">My PC</A>
 
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