Vcore voltage question when overclocking!

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Mari0Br0s

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Feb 22, 2005
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Hi guys,

Is that right that, if we do not put an higher Vcore voltage, the cpu temp won't increase? That's logical, and this is what I always though, but when I saw some screenshot on an thread at Xtremesystems.org, guys overclocking their new San Diego 3700+ @ 3.0GHz @ stock Vcore using water cooled, but not able to reach it using air cooling.... Why? The Vcore hasn't been changed... I don't understand!!!
 
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sangyup81

Golden Member
Feb 22, 2005
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Increasing clock speed increases heat as well. Just not as much as if you do both clock speed and voltage at the same time.
 
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Duvie

Elite Member
Feb 5, 2001
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Originally posted by: sangyup81
Increasing clock speed increases heat as well. Just not as much as if you do both clock speed and voltage at the same time.
Click to expand...



That is right...I was able to OC mt 2.4c like 800mhz and the idle temp increased like 1-2c and load 3-4c....I upped the vcore to 1.58v ( a modest vcore boost) and uppped it 300mhz and the temps were 3-4c higher idle and near 8-10c load....
 
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Mari0Br0s

Member
Feb 22, 2005
109
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ok, the bus speed of an A64 3700+ is 2000MHz, that means the max fsb should be 1000. If I got DDR600 ram, and I put my fsb to 300, the cpu temps will increase? cuz i'll only be using 300/1000.
 
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BigBadBiologist

Platinum Member
Nov 30, 2002
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Well, I'm not exactly sure what numbers you are talking about there. Everything is based off of the HTT bus speed, which default is 200MHz. The CPU is multiplied by 11 to get 2.2 GHz. If you set your HTT to 300 (if your mobo is stable at that speed) and lowered your CPU multiplier to 7.5, your overall CPU speed would be about the same, so you probably wouldn't see a temp increase. But your south bridge chip will get a lot hotter!

However, there is no RAM that will run that fast. Also, since the memory controller is built on to the CPU, increasing memory speed that far doesn't do a whole lot for system performance anyway.
 
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sangyup81

Golden Member
Feb 22, 2005
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Originally posted by: Mari0Br0s
ok, the bus speed of an A64 3700+ is 2000MHz, that means the max fsb should be 1000. If I got DDR600 ram, and I put my fsb to 300, the cpu temps will increase? cuz i'll only be using 300/1000.
Click to expand...

That 2000 and 1000 stuff is your HTT * LDT. By default it is 200*5 = 1000. That 2000 number is just the 1000 doubled so that it looks better on paper. This speed is the speed between your CPU and Chipset.

If you increase your HTT to 300, you need to decrease your LDT to 3 (300*3=900). Don't worry about having a speed of 900 instead of 1000 since Athlon 64s barely even utilize 600.

Read the guides for more details.
 
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sangyup81

Golden Member
Feb 22, 2005
1,082
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81
Originally posted by: BigBadBiologist
Well, I'm not exactly sure what numbers you are talking about there. Everything is based off of the HTT bus speed, which default is 200MHz. The CPU is multiplied by 11 to get 2.2 GHz. If you set your HTT to 300 (if your mobo is stable at that speed) and lowered your CPU multiplier to 7.5, your overall CPU speed would be about the same, so you probably wouldn't see a temp increase. But your south bridge chip will get a lot hotter!

However, there is no RAM that will run that fast. Also, since the memory controller is built on to the CPU, increasing memory speed that far doesn't do a whole lot for system performance anyway.
Click to expand...

There are alot of RAM that will run at DDR600 if you have the money for it
 
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BigBadBiologist

Platinum Member
Nov 30, 2002
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Mari0Br0s

Member
Feb 22, 2005
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hehe I knew i wasn't that out of date!

Well, thanks a lot guys, it seems that I need to read a guide to known how to overclock an A64 :D, I'm only used to Barton and P4.
 
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