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50 degrees C

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February 4, 2003 10:31:10 PM

Hi is 50 degrees warm or above warm on a t-bird core 1.0gig at 266 fsb. i lower mult. to 8 and raised bus from 100 to 133 20 percent gain in sissoft but im afraid if a fire up a game the chip may reach 60C. what's your thougths

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February 4, 2003 11:36:35 PM

50C is fine. RELAX
If you start experiencing freezes and lockups while running full load on the CPU then you should do something.

<b>My Computer is so powerful Sauron Desires it and mortal men Covet it, <i>My Precioussssssss</i></b>
February 5, 2003 1:00:26 AM

ok ran game just fine got to 59c but motherboard (a7v8nx was still running 71C) held up ok imgoing to keep this seeting till i get a better cpu. might try to lower my mem cas to 2.0 from 2.5 lets see what happens
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February 5, 2003 1:06:25 AM

Master poobaa, I have a question for you. If one keeps the core volatge the same and simply highers the fsb or clock multiplier, will there be added heat (or significant amounts of it) or is that more of a result of increased voltage?

"If everything seems under control, you're just not going fast enough."
- Mario Andretti
February 5, 2003 1:23:27 AM

59C is getting a bit warmer... but it really depends on how accurate your method of measurement is... and you dont know that.
Ive had one cpu crash at anything above 50, yet a latter one get up to 86C without issue.

And there is no way your motherboard is running at 71C... that must be a reading from somehwere else, or a fake one.

lowering the mem Cas will improve performance a little, but do nothing with your temps.

<b>My Computer is so powerful Sauron Desires it and mortal men Covet it, <i>My Precioussssssss</i></b>
February 5, 2003 1:37:54 AM

That is correct yes, increased Mhz does increase the power consumption & thermal output, even if the Core Voltage is the same. This does NOT hold true for just FSB change though if total Mhz stays the same.
e.g. 12.5x133 = 1666mhz will put out the same amount of heat as 10x166 = 1666Mhz.

A while ago i learnt this following equation, and it seems to hold reasonable true for overclocking, and explains well the contributions to total heat output.

<b>Thermal Output (W) = Stock Speed Output X (OC Mhz / Stock Mhz) X (OC voltage ^2 / Stock voltage ^2)</b>

So using my current CPU as an example:
TbredA Xp1700+ at stock 1.5v = 49.4W max thermal output according to the electrical specs.
At same speed (1466mhz) but with 1.6v = 49.4 X (1466/1466) X (1.6^2/1.5^2) = 56.2W
At 1583Mhz @ 1.5v (max speed it can do at stock voltage) = 49.4 X (1583/1466) X (1.5^2/1.5^2) = 53.3W

So from the formula the heat output is increased linearly with Mhz increase, but increased by a power of 2 with regards to voltage.

And for my MAX OC = 49.4 X (1833/1466) X (1.7^2/1.5^2) = 79.5W. Quite warm.


<b>My Computer is so powerful Sauron Desires it and mortal men Covet it, <i>My Precioussssssss</i></b><P ID="edit"><FONT SIZE=-1><EM>Edited by LHGPooBaa on 02/04/03 10:50 PM.</EM></FONT></P>
February 5, 2003 2:05:01 AM

Hmm, so I COULD make my fsb higher and get away with it. Cool.

"If everything seems under control, you're just not going fast enough."
- Mario Andretti
February 5, 2003 3:31:14 AM

If you lower the multiplier respectivly...
or depending on how far you can go without a voltage bump.

<b>My Computer is so powerful Sauron Desires it and mortal men Covet it, <i>My Precioussssssss</i></b>
February 5, 2003 3:50:45 AM

here's a good question for you....

How does one get multiplier above 12.5 on a T-Bred A 1800+ CPU ??

i cant select anything higher than 12.5 in my BIOS and the chip is factory unlocked (all L1's are closed) and it runs at 1667Mhz at defualt voltage (1.5) so i wanna know how much further i can go with default voltage but i have no settign for over 12.5....interestign thign is when i pop in a T-Bird CPU or my Palomino XP 1600+ i get all multipliers up to 15.5 or 16 or something like that....

<A HREF="http://www.anandtech.com/mysystemrig.html?id=13597" target="_new">-MeTaL RoCkEr</A>
February 5, 2003 4:37:43 AM

I could be your BIOS/motherboard won't support over a 12.5 multiplier

You need increased voltage to keep stability if you are FSB overclocking. I've found this out though personal experience, believe me.

I was discussing this in another post. Increasing the Vcore allows transistors in your processor to switch faster. However, theoretically, if the Vcore gets too high you could shorten the lifespan of your processor EVEN if you have sufficient cooling (for example, your processor may give out after 5 years instead of 10).

I have an 1800+ Palomino and I won't set mine above 1.825, though there is a 1.850 option General rule of thumb you aren't supposed to overclock parts more than 10%

I've found I also need to adjust my DDR voltage as well, if I am increasing the FSB. That goes from 2.5 to 2.8, I leave mine at 2.7

Right now I am running smoothly at 143 FSB.

-----

Benchmarks don't lie :-)
February 5, 2003 5:51:09 AM

a idea is open the case up and buy a can of air if you have not clean the inside in a while. But everyone here right 50c fine Mine runs 48 to 55c. When it hits around 60c I clean it.
February 5, 2003 6:31:07 AM

Ahhh. thats the only downside... i believe the multipliers are unlocked only up to 12.5.

Usually though this is not a problems as people push the fsb to something like 167 or better and so the chances of exceeding 12.5x is slim.

in any case its easy to unlock higher ones... simply connect the last L3 bridge with a semicircle of conductive ink, as the Unlocking guides state.

<b>My Computer is so powerful Sauron Desires it and mortal men Covet it, <i>My Precioussssssss</i></b>
February 5, 2003 3:36:34 PM

Ahh alright thanx...
The reason im NOT running at 166Mhz FSB yet is my board does not support it....its a ASUS A7S333...SiS745 chipset only 100 and 133Mhz compatible theres no 1/5 divider lock....ive tryed lowering the multiplier as low as 5.0 and running it at 166Mhz FSB and it posts etc. but wont boto windows it BSOD's as i guess the video card and PCI devices cant handle the stress....

<A HREF="http://www.anandtech.com/mysystemrig.html?id=13597" target="_new">-MeTaL RoCkEr</A>
February 5, 2003 8:54:38 PM

no 1/5 in the sis 745? wow... what a bummer.
I just assumed incorrectly that you had a kt333 or better.
Its obviously that 166 with 1/4 just kills your pci devices.

why dont you try the unlocking trick? its pretty easy

<b>My Computer is so powerful Sauron Desires it and mortal men Covet it, <i>My Precioussssssss</i></b>
February 6, 2003 2:17:03 AM

a silver marker pen and a toothpic can do it.
As its the L3 end bridge trick it doesnt have to be technical, just get around the trench and its done!

there is a "how to" guide over at <A HREF="http://overclockers.com.au" target="_new">http://overclockers.com.au&lt;/A>
as far as i can tell it works for all tbreds.

<b>My Computer is so powerful Sauron Desires it and mortal men Covet it, <i>My Precioussssssss</i></b>
!