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
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
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
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>
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>
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....
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
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....